NORTHWEST AIRLINES CORP
S-3, 1996-10-02
AIR TRANSPORTATION, SCHEDULED
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<PAGE>
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 2, 1996
 
                                                        REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-3
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
          NORTHWEST AIRLINES                       NORTHWEST AIRLINES,
             CORPORATION                                   INC.
           (Exact name of Registrants as specified in their charters)
 
               DELAWARE                                 MINNESOTA
         (State or other jurisdiction of incorporation or organization)
 
                 4512                                      4512
            (Primary Standard Industrial Classification Code Number)
 
              95-4205287                                41-0449230
                    (I.R.S. Employer Identification Number)
 
                            ------------------------
 
                             2700 LONE OAK PARKWAY
                             EAGAN, MINNESOTA 55121
                                 (612) 726-2111
 
  (Address, including zip code, and telephone number, including area code, of
                   Registrants' principal executive offices)
 
                         ------------------------------
 
                           DOUGLAS M. STEENLAND, ESQ.
              SENIOR VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY
                         NORTHWEST AIRLINES CORPORATION
                             2700 LONE OAK PARKWAY
                             EAGAN, MINNESOTA 55121
                                 (612) 726-2111
 
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                         ------------------------------
 
                                    COPY TO:
 
                               WILSON NEELY, ESQ.
                           SIMPSON THACHER & BARTLETT
                              425 LEXINGTON AVENUE
                         NEW YORK, NEW YORK 10017-3954
                                 (212) 455-2000
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
   From time to time after the effective date of this registration statement.
 
    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. / /
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended, other than securities offered only in connection with dividend
or interest reinvestment plans, please check the following box. /X/
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / /
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /
 
                                                   (CONTINUED ON FOLLOWING PAGE)
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    Pursuant to Rule 429 of the Rules and Regulations of the Securities and
Exchange Commission under the Securities Act of 1933, as amended, the Forms of
Prospectus included in this Registration Statement also relate to an aggregate
remaining amount of up $225,500,000 of the classes of Securities covered by such
Forms of Prospectus previously registered under the Registration Statement on
Form S-3 (File No. 333-2516). A filing fee of $77,758.62 was paid on March 19,
1996 in connection with such remaining amount.
                            ------------------------
 
    The Registrants hereby amend this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrants
shall file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933, as amended, or until the Registration Statement
shall become effective on such date as the Commission, acting pursuant to said
Section 8(a), may determine.
                            ------------------------
 
<TABLE>
<CAPTION>
                                                                                     PROPOSED MAXIMUM
                                                                                    AGGREGATE OFFERING      AMOUNT OF
                                                                                        PRICE (1)        REGISTRATION FEE
<S>                                                                                 <C>                 <C>
Convertible Debt Securities of Northwest Airlines Corporation (2).................
Class A Common Stock, par value $.01 per share, of Northwest Airlines Corporation
  (3).............................................................................
Preferred Stock, par value $.01 per share, of Northwest Airlines Corporation
  (4).............................................................................
Warrants to Purchase Class A Common Stock of Northwest Airlines Corporation (5)...
Guarantees of Northwest Airlines Corporation (6)..................................     $274,500,000         $83,181.82
Debt Securities of Northwest Airlines, Inc. (2)...................................
Warrants to Purchase Debt Securities of Northwest Airlines, Inc. (7)..............
Pass Through Certificates of Northwest Airlines, Inc. (2).........................
</TABLE>
 
(1) In United States dollars or the equivalent thereof in foreign currency or
    currency units.
 
(2) If any of these securities are issued at an original issue discount, the
    principal amount will be increased such that the aggregate proceeds will
    equal $500,000,000.
 
(3) Such indeterminate number of shares of Class A Common Stock as may from time
    to time be issued at indeterminate prices, including Class A Common Stock
    issuable upon conversion of Convertible Debt Securities, upon conversion or
    redemption of Preferred Stock or upon exercise of Warrants to purchase Class
    A Common Stock. Includes Preferred Share Purchase Rights which, prior to the
    occurrence of certain events, will not be exercisable or evidenced
    separately from the Class A Common Stock.
 
(4) Such indeterminate number of shares of Preferred Stock as may from time to
    time be issued at indeterminate prices.
 
(5) Warrants for the purchase of Class A Common Stock of Northwest Airlines
    Corporation may be offered and sold separately or together with Class A
    Common Stock or Preferred Stock of Northwest Airlines Corporation or Debt
    Securities of Northwest Airlines, Inc.
 
(6) To be issued in connection with Debt Securities and Pass Through
    Certificates of Northwest Airlines, Inc.
 
(7) Warrants for the purchase of Debt Securities of Northwest Airlines, Inc. may
    be offered and sold separately or together with other Debt Securities of
    Northwest Airlines, Inc.
<PAGE>
                                EXPLANATORY NOTE
 
    This Registration Statement consists of three separate Prospectuses,
covering securities to be registered as follows:
 
    (1) Convertible Debt Securities, Class A Common Stock, par value $.01 per
       share, Preferred Stock, par value $.01 per share, and Warrants to
       Purchase Class A Common Stock, of Northwest Airlines Corporation;
 
    (2) Debt Securities and Warrants to Purchase Debt Securities of Northwest
       Airlines, Inc. and Guarantees of such Debt Securities by Northwest
       Airlines Corporation; and
 
    (3) Pass Through Certificates of Northwest Airlines, Inc. and related
       Guarantees of Northwest Airlines Corporation.
 
    Separate financial statements of Northwest Airlines, Inc. are not being
provided because all of the securities being issued by Northwest Airlines, Inc.
under this Registration Statement are fully and unconditionally guaranteed by
Northwest Airlines Corporation and such separate financial statements are
therefore not deemed material.
<PAGE>
                  SUBJECT TO COMPLETION, DATED OCTOBER 2, 1996
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
PROSPECTUS
 
                                  $500,000,000
 
                         NORTHWEST AIRLINES CORPORATION
 
                          CONVERTIBLE DEBT SECURITIES
                                PREFERRED STOCK
                              CLASS A COMMON STOCK
                   WARRANTS TO PURCHASE CLASS A COMMON STOCK
 
    Northwest Airlines Corporation ("NWA Corp." and, together with its
subsidiaries, the "Company") may from time to time offer, together or
separately, (i) its convertible debt securities (the "Convertible Debt
Securities"), which may be either senior debt securities ("Convertible Senior
Debt Securities") or subordinated debt securities ("Convertible Subordinated
Debt Securities"), consisting of debentures, notes and/or other evidences of
indebtedness representing unsecured obligations of NWA Corp. convertible into
Class A Common Stock, par value $.01 per share ("Class A Common Stock"), (ii)
shares of its Preferred Stock, par value $.01 per share (the "Preferred Stock"),
(iii) shares of its Class A Common Stock, and (iv) warrants to purchase shares
of its Class A Common Stock (the "Warrants" and, together with the Preferred
Stock, the Class A Common Stock and the Convertible Debt Securities, the
"Securities") in amounts, at prices and on terms to be determined at the time of
offering. The Securities offered pursuant to this Prospectus may be issued in
one or more series or issuances and will be limited to $500,000,000 aggregate
public offering price and exercise price (or its equivalent (based on the
applicable exchange rate at the time of sale) in one or more foreign currencies
or currency units).
 
    The specific terms of the particular Securities in respect of which this
Prospectus is being delivered (the "Offered Securities") will be set forth in a
supplement to this Prospectus (the "Prospectus Supplement") which will be
delivered together with this Prospectus, including, where applicable, in the
case of Convertible Debt Securities, the specific designation, aggregate
principal amount, denomination, maturity, premium, if any, rate (which may be
fixed or variable), time and method of calculating payments of interest, if any,
place or places where principal of, premium, if any, and interest, if any, on
such Convertible Debt Securities will be payable, the currency in which
principal of, premium, if any, and interest, if any, on such Convertible Debt
Securities will be payable, any terms of redemption at the option of NWA Corp.
or the holder, any sinking fund provisions, terms for conversion into Class A
Common Stock, the initial public offering price and other special terms and, in
the case of Preferred Stock, the specific series title and stated value and the
specific terms, designations, rights and preferences, including any dividend,
liquidation, redemption, voting and other rights, any terms for exchange for
Convertible Debt Securities or conversion into Class A Common Stock, the initial
public offering price and other special terms and, in the case of any Warrants,
the specific designation, aggregate number, duration, initial public offering
price, exercise price, currency in which the exercise price is payable,
detachability of any Warrants, the number of shares of Class A Common Stock for
which such Warrants are exercisable, the terms of any mandatory or optional call
and other special terms, together with any other terms in connection with the
offering and sale of the Offered Securities. If so specified in the applicable
Prospectus Supplement, Convertible Debt Securities of a series may be issued in
whole or in part in the form of one or more temporary or permanent global
securities. This Prospectus, together with the Prospectus Supplement relating to
any Warrants that have been issued, may also be delivered in connection with the
issuance of the Class A Common Stock for which such Warrants are exercised.
 
    The Convertible Senior Debt Securities will rank equally with all other
unsubordinated and unsecured indebtedness of NWA Corp. The Convertible
Subordinated Debt Securities will be subordinated in right of payment to all
Senior Indebtedness of NWA Corp. (as hereinafter defined). See "Description of
Convertible Debt Securities--Subordination of Convertible Subordinated Debt
Securities." As of June 30, 1996, NWA Corp. had $609.9 million of long-term debt
obligations (consisting entirely of NWA Corp.'s guarantees of the indebtedness
of subsidiaries) ranking PARI PASSU in right of payment with the Convertible
Senior Debt Securities, none of which was secured by NWA Corp.'s assets, and no
long-term debt or capital lease obligations ranking senior in right of payment
to the Convertible Senior Debt Securities. As of the same date, NWA Corp. had
$609.9 million of long-term debt obligations (consisting entirely of NWA Corp.'s
guarantees of the indebtedness of subsidiaries) ranking prior in right of
payment to the Convertible Subordinated Debt Securities and no obligations which
would rank PARI PASSU in right of payment with the Convertible Subordinated Debt
Securities.
                           --------------------------
 
    NWA Corp. may sell the Securities to or through underwriters, through
dealers or agents or directly to purchasers. See "Plan of Distribution." The
Prospectus Supplement will set forth the names of any underwriters, dealers or
agents involved in the sale of the Offered Securities in respect of which this
Prospectus is being delivered, the proposed amounts, if any, to be purchased by
underwriters and the compensation, if any, of such underwriters or agents.
 
    THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE SALES OF SECURITIES UNLESS
ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.
                           --------------------------
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
     EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
            REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
               The date of this Prospectus is            , 1996.
<PAGE>
                             AVAILABLE INFORMATION
 
    NWA Corp. and Northwest Airlines, Inc. ("Northwest") together have filed
with the Securities and Exchange Commission (the "Commission") a Registration
Statement on Form S-3 (together with all amendments and exhibits, the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"), with respect to the Securities offered hereby. This
Prospectus does not contain all of the information set forth in the Registration
Statement, certain parts of which are omitted in accordance with the rules and
regulations of the Commission, and to which reference is hereby made. Statements
made in this Prospectus as to the contents of any contract, agreement or other
document referred to are not necessarily complete. With respect to each such
contract, agreement or other document filed as an exhibit to the Registration
Statement, reference is made to the exhibit for a more complete description of
the matter involved.
 
    NWA Corp. is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files periodic reports and other information with the Commission. Such
reports and other information, as well as the Registration Statement, including
exhibits and schedules filed therewith, may be inspected at the public reference
facilities maintained by the Commission at 450 Fifth Street, N.W., Washington,
D.C. 20549, Room 1024, and at the regional offices of the Commission located at
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661
and at 7 World Trade Center, 13th Floor, New York, New York 10048. Copies of
such materials may be obtained from the Public Reference Section of the
Commission, 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed rates.
The Commission maintains a Web site (http:www.sec.gov) that contains reports,
proxy and information statements and other information regarding registrants
that file electronically with the Commission. Northwest is not required to file
separate reports, proxy statements or other information with the Commission
pursuant to the requirements of the Exchange Act. Instead, information with
respect to Northwest is provided, to the extent required, in filings made by NWA
Corp.
 
    UNLESS OTHERWISE STATED HEREIN, INFORMATION CONTAINED HEREIN CONCERNING THE
AGGREGATE NUMBER OF SHARES AND RESPECTIVE PERCENTAGES OF NWA CORP. STOCK HELD BY
INVESTORS IS BASED ON THE FOLLOWING ASSUMPTIONS: (I) THE ISSUANCE OF ALL CLASS A
COMMON STOCK AND CLASS B COMMON STOCK, PAR VALUE $.01 PER SHARE, OF NWA CORP.,
(THE "CLASS B COMMON STOCK" AND, TOGETHER WITH THE CLASS A COMMON STOCK, THE
"COMMON STOCK") AND SERIES C PREFERRED STOCK TO BE ISSUED TO THE EMPLOYEE TRUSTS
(AS DEFINED HEREIN) PURSUANT TO THE EQUITY LETTER AGREEMENTS (AS DEFINED HEREIN)
AND THE CONVERSION OF THE SERIES C PREFERRED STOCK INTO COMMON STOCK AND (II)
THE EXERCISE OF ALL STOCK OPTIONS HELD BY EXECUTIVE OFFICERS THAT ARE
EXERCISABLE WITHIN 60 DAYS OF JULY 31, 1996.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents of NWA Corp., which have been filed with the
Commission, are hereby incorporated by reference in this Prospectus:
 
    (a) NWA Corp.'s Annual Report on Form 10-K for the fiscal year ended
       December 31, 1995;
 
    (b) NWA Corp.'s Quarterly Reports on Form 10-Q for the quarters ended March
       31, 1996 and June 30, 1996; and
 
    (c) the description of NWA Corp.'s Class A Common Stock set forth in its
       Registration Statement on Form 8-A, dated March 16, 1994, the description
       of rights to purchase NWA Corp.'s Series D Junior Participating Preferred
       Stock set forth in its Registration Statement on Form 8-A, dated November
       17, 1995, and any amendment or report filed pursuant to Section 12 of the
       Exchange Act for the purpose of updating those descriptions.
 
    All documents filed by NWA Corp. pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering of the Securities offered hereby shall be deemed
to be incorporated by reference into this Prospectus and to be a part hereof
from the respective dates of filing of such documents. Any statement contained
in a document incorporated or deemed to be incorporated by reference herein
shall be deemed to be modified or superseded for purposes of this Prospectus to
the extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus. The Exchange Act file number is 0-23642.
 
    NWA Corp. will provide without charge to any person to whom a copy of this
Prospectus has been delivered, upon written or oral request, a copy of any or
all of the foregoing documents incorporated herein by reference (other than
exhibits to such documents). Requests should be directed to the Secretary's
Office, NWA Corp., 5101 Northwest Drive, Dept. A1180, St. Paul, Minnesota
55111-3034, telephone number (612) 726-2111.
 
                                       2
<PAGE>
                                  THE COMPANY
 
    NWA Corp. was incorporated in February 1989 under the laws of the State of
Delaware. Northwest, the principal wholly-owned indirect subsidiary of NWA
Corp., operates the world's fourth largest airline (as measured by 1995 revenue
passenger miles ("RPMs")) and is engaged principally in commercial
transportation of passengers and cargo. Northwest's business focuses on the
development of a global airline network through the optimization of Northwest's
strategic assets, which include domestic hubs at Detroit and Minneapolis/St.
Paul, an extensive Pacific route system with a hub at Tokyo, and a transatlantic
alliance with KLM Royal Dutch Airlines ("KLM").
 
    Northwest operates substantial domestic and international route networks and
as of June 30, 1996 directly serves more than 150 cities in 18 countries on the
continents of North America, Asia and Europe. Northwest had more than 49 million
enplanements and flew over 62 billion RPMs in 1995.
 
    NWA Inc., the parent company of Northwest, was acquired in 1989 (the
"Acquisition") by NWA Corp., a Delaware corporation formed by Alfred A. Checchi,
Gary L. Wilson, Frederic V. Malek, Fosters Brewing Group Ltd. of Australia
("Fosters"), Bankers Trust New York Corporation ("BTNY"), KLM and Richard C.
Blum & Associates--NWA Partners, L.P. ("Blum") (together (other than Fosters,
which has sold its interest in NWA Corp. to KLM), the "Original Investors") for
the purpose of the Acquisition. As of July 31, 1996, the Original Investors
beneficially owned approximately 46.9% of the common equity representing
approximately 46.2% of the voting equity of NWA Corp. In addition, pursuant to
certain agreements (the "Equity Letter Agreements") entered into by the Company
with several unions representing the Company's employees, NWA Corp. will have
issued to trusts (the "Employee Trusts") for the benefit of Company employees
shares of Series C Preferred Stock and Common Stock which represent
approximately 22.7% of the voting equity of the Company as July 31, 1996. The
holders of Series C Preferred Stock have the right to elect three of the
Company's directors (the "Series C Directors"). The Original Investors are
parties to an Investor Stockholders' Agreement (the "Stockholders' Agreement")
which governs their votes for the election of 11 of the Company's directors. The
Stockholders' Agreement expires in July 1999, subject to earlier termination in
certain circumstances. See "Corporate Governance and Control."
                            ------------------------
 
    NWA Corp. was originally formed under the name Wings Holdings Inc. The
Company's principal executive offices are located at 2700 Lone Oak Parkway,
Eagan, Minnesota 55121; its mailing address is 5101 Northwest Drive, St. Paul,
Minnesota 55111-3034 and its telephone number is (612) 726-2111.
 
                                DIVIDEND POLICY
 
    Since the Acquisition, the Company has not declared or paid any dividends on
the Common Stock and does not currently intend to do so. In addition, the
Company is effectively precluded from paying dividends or making other
distributions to the holders of the Common Stock or repurchasing the Common
Stock without the consent of the holders of the Series A and Series B Preferred
Stock. While KLM as one of the two holders of such shares has provided such
consent, there can be no assurance that the other holder will grant such a
consent. Any future determination to pay cash dividends will be at the
discretion of the Board of Directors, subject to applicable limitations under
Delaware law, and will be dependent upon the Company's results of operations,
financial condition, contractual restrictions and other factors deemed relevant
by the Board of Directors.
 
                                USE OF PROCEEDS
 
    Unless otherwise indicated in the applicable Prospectus Supplement, the net
proceeds to NWA Corp. from the sale of the Securities offered hereby will be
added to the working capital of NWA Corp. and will be available for general
corporate purposes, among which may be the repayment of outstanding indebtedness
and financing of capital expenditures. The Company does not currently expect to
discharge any such
 
                                       3
<PAGE>
indebtedness or finance any such capital expenditures with the proceeds of the
sale of Securities offered hereby.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
                     AND RATIO OF EARNINGS TO FIXED CHARGES
                        AND PREFERRED STOCK REQUIREMENTS
 
    The following table sets forth the ratio of earnings to fixed charges and
the ratio of earnings to fixed charges and preferred stock requirements for NWA
Corp. and its consolidated subsidiaries for the periods indicated. The ratio of
earnings to fixed charges represents the number of times that fixed charges were
covered by earnings. In computing the ratio, earnings represent consolidated
earnings (loss) before income taxes, cumulative effect of accounting change and
fixed charges (excluding capitalized interest). Fixed charges consist of
interest expense (including capitalized interest), one-third of rental expense,
which is considered representative of the interest factor, and amortization of
debt discount and expense.
 
<TABLE>
<CAPTION>
                                                                           YEAR ENDED DECEMBER 31
                                                                        ----------------------------
                                                                        1995  1994  1993  1992  1991
                                                                        ----  ----  ----  ----  ----
<S>                                                                     <C>   <C>   <C>   <C>   <C>
Ratio of earnings to fixed charges....................................  1.91  1.88  (a)   (a)   (a)
Ratio of earnings to fixed charges and preferred stock requirements...  1.66  1.60  (b)   (b)   (b)
</TABLE>
 
- ------------------------
 
(a) Earnings did not cover fixed charges by $121.5 million for the year ended
    December 31, 1993, $1,513.5 million for the year ended December 31, 1992 and
    $522.1 million for the year ended December 31, 1991. Excluding non-recurring
    special charges of $94.3 million for the year ended December 31, 1993, and
    $792.7 million for the year ended December 31, 1992, earnings did not cover
    fixed charges by $27.2 million and $720.8 million for the two periods,
    respectively.
 
(b) Earnings did not cover fixed charges and preferred stock requirements by
    $213.7 million for the year ended December 31, 1993, $1,589 million for the
    year ended December 31,1992 and $589.8 million for the year ended December
    31, 1991. Excluding non-recurring special charges of $94.3 million for the
    year ended December 31, 1993 and $792.7 million for the year ended December
    31, 1992, earnings did not cover fixed charges and preferred stock
    requirements by $119.4 million and $796.3 million for the two periods,
    respectively.
 
                   DESCRIPTION OF CONVERTIBLE DEBT SECURITIES
 
    The Convertible Senior Debt Securities are to be issued under an Indenture
(the "Convertible Senior Indenture") between NWA Corp., as issuer, and State
Street Bank & Trust Company, successor to The First National Bank of Boston, as
Trustee. The Convertible Subordinated Debt Securities are to be issued under an
Indenture (the "Convertible Subordinated Indenture") between NWA Corp., as
issuer, and State Street Bank & Trust Company, successor to The First National
Bank of Boston, as Trustee. The Convertible Senior Indenture and the Convertible
Subordinated Indenture are referred to herein individually as an "Indenture" and
collectively as the "Indentures." A copy of the form of each Indenture is filed
as an exhibit to the Registration Statement of which this Prospectus is a part.
 
    The statements herein relating to the Convertible Debt Securities and the
Indentures are summaries and reference is made to the detailed provisions of the
Indentures, including the definitions therein of certain terms capitalized in
this Prospectus. Where no distinction is made between the Convertible Senior
Debt Securities and the Convertible Subordinated Debt Securities or between the
Convertible Senior Indenture and the Convertible Subordinated Indenture, such
summaries refer to any Convertible Debt Securities and either Indenture.
Whenever particular defined terms of the Indentures are referred to herein or in
a Prospectus Supplement, such defined terms are incorporated herein or therein
by reference.
 
                                       4
<PAGE>
    The anticipated market for the Convertible Debt Securities and the specific
use of proceeds of an offering of such securities will be set forth in the
applicable Prospectus Supplement.
 
GENERAL
 
    The Indentures do not limit the aggregate principal amount of Convertible
Debt Securities which may be issued thereunder and provide that Convertible Debt
Securities may be issued from time to time in one or more series. The
Convertible Senior Debt Securities will be unsecured and unsubordinated
obligations of NWA Corp. and will rank on a parity with all other unsecured and
unsubordinated indebtedness of NWA Corp. The Convertible Subordinated Debt
Securities will be unsecured obligations of NWA Corp. and, as set forth below
under "Subordination of Convertible Subordinated Debt Securities," will be
subordinated in right of payment to all Senior Indebtedness.
 
    Reference is made to the Prospectus Supplement which accompanies this
Prospectus for a description of the specific series of Convertible Debt
Securities being offered thereby, including: (1) the specific designation of
such Convertible Debt Securities; (2) any limit upon the aggregate principal
amount of such Convertible Debt Securities; (3) the date or dates on which the
principal of such Convertible Debt Securities will mature or the method of
determining such date or dates; (4) the rate or rates (which may be fixed or
variable) at which such Convertible Debt Securities will bear interest, if any,
or the method of calculating such rate or rates; (5) the date or dates from
which interest, if any, will accrue or the method by which such date or dates
will be determined; (6) the date or dates on which interest, if any, will be
payable and the record date or dates therefor; (7) the place or places where
principal of, premium, if any, and interest, if any, on such Convertible Debt
Securities will be payable; (8) the period or periods within which, the price or
prices at which, the currency or currencies (including currency units) in which,
and the terms and conditions upon which, such Convertible Debt Securities may be
redeemed, in whole or in part, at the option of NWA Corp.; (9) the obligation,
if any, of NWA Corp. to redeem or purchase such Convertible Debt Securities
pursuant to any sinking fund or analogous provisions, upon the happening of a
specified event or at the option of a holder thereof and the period or periods
within which, the price or prices at which and the terms and conditions upon
which, such Convertible Debt Securities shall be redeemed or purchased, in whole
or in part, pursuant to such obligations; (10) the denominations in which such
Convertible Debt Securities are authorized to be issued; (11) the terms and
conditions upon which conversion will be effected, including the conversion
price, the conversion period, and other conversion provisions in addition to or
in lieu of those described below; (12) the currency or currency units for which
Convertible Debt Securities may be purchased or in which Convertible Debt
Securities may be denominated and/or the currency or currency units in which
principal of, premium, if any, and/or interest, if any, on such Convertible Debt
Securities will be payable or redeemable and whether NWA Corp. or the holders of
any such Convertible Debt Securities may elect to receive payments in respect of
such Convertible Debt Securities in a currency or currency units other than that
in which such Convertible Debt Securities are stated to be payable or
redeemable; (13) if other than the principal amount thereof, the portion of the
principal amount of such Convertible Debt Securities which will be payable upon
declaration of the acceleration of the maturity thereof or the method by which
such portion shall be determined; (14) the person to whom any interest on any
such Convertible Debt Security shall be payable if other than the person in
whose name such Convertible Debt Security is registered on the applicable record
date; (15) any addition to, or modification or deletion of, any Event of Default
or any covenant of NWA Corp. specified in the Indenture with respect to such
Convertible Debt Securities; (16) the application, if any, of such means of
defeasance or covenant defeasance as may be specified for such Convertible Debt
Securities; (17) whether such Convertible Debt Securities are to be issued in
whole or in part in the form of one or more temporary or permanent global
securities and, if so, the identity of the depositary for such global security
or securities; (18) any index used to determine the amount of payments of
principal of, premium, if any, and interest, if any, on such Convertible Debt
Securities; (19) any provisions relating to the conversion or exchange of such
Convertible Debt Securities; and (20) any other special terms pertaining to
 
                                       5
<PAGE>
such Convertible Debt Securities. Unless otherwise specified in the applicable
Prospectus Supplement, the Convertible Debt Securities will not be listed on any
securities exchange.
 
    Unless otherwise specified in the applicable Prospectus Supplement,
Convertible Debt Securities will be issued in fully registered form without
coupons. Where Convertible Debt Securities of any series are issued in bearer
form, the special restrictions and considerations, including special offering
restrictions and special Federal income tax considerations, applicable to any
such Convertible Debt Securities and to payment on and transfer and exchange of
such Convertible Debt Securities will be described in the applicable Prospectus
Supplement. Bearer Convertible Debt Securities will be transferable by delivery.
 
    Convertible Debt Securities may be sold at a substantial discount below
their stated principal amount, bearing no interest or interest at a rate which
at the time of issuance is below market rates. Certain Federal income tax
consequences and special considerations applicable to any such Convertible Debt
Securities will be described in the applicable Prospectus Supplement.
 
    If the purchase price of any Convertible Debt Securities is payable in one
or more foreign currencies or currency units or if any Convertible Debt
Securities are denominated in one or more foreign currencies or currency units
or if the principal of, premium, if any, or interest, if any, on any Convertible
Debt Securities is payable in one or more foreign currencies or currency units,
the restrictions, elections, certain Federal income tax considerations, specific
terms and other information with respect to such issue of Convertible Debt
Securities and such foreign currency or currency units will be set forth in the
applicable Prospectus Supplement.
 
DENOMINATIONS, PAYMENT, REGISTRATION, TRANSFER AND EXCHANGE
 
    Registered Securities will be issuable in denominations of $1,000 and
integral multiples of $1,000, and Bearer Securities will be issuable in the
denomination of $5,000 or, in each case, in such other denominations and
currencies as may be in the terms of the Convertible Debt Securities of any
particular series. Unless otherwise provided in the applicable Prospectus
Supplement, payments in respect of the Convertible Debt Securities will be made,
subject to any applicable laws and regulations, in the designated currency at
the office or agency of NWA Corp. maintained for that purpose as NWA Corp. may
designate from time to time, except that, at the option of NWA Corp., interest
payments, if any, on Convertible Debt Securities in registered form may be made
(i) by checks mailed by the Trustee to the holders of Convertible Debt
Securities entitled thereto at their registered addresses or (ii) by wire
transfer to an account maintained by the Person entitled thereto as specified in
the Register. Unless otherwise indicated in an applicable Prospectus Supplement,
payment of any installment of interest on Convertible Debt Securities in
registered form will be made to the Person in whose name such Convertible Debt
Security is registered at the close of business on the regular record date for
such interest.
 
    Payment in respect of Convertible Debt Securities in bearer form will be
payable in the currency and in the manner designated in the applicable
Prospectus Supplement, subject to any applicable laws and regulations, at such
paying agencies outside the United States as NWA Corp. may appoint from time to
time. The paying agents outside the United States, if any, initially appointed
by NWA Corp. for a series of Convertible Debt Securities will be named in the
applicable Prospectus Supplement. NWA Corp. may at any time designate additional
Paying Agents or rescind the designation of any paying agents, except that, if
Convertible Debt Securities of a series are issuable as Registered Securities,
NWA Corp. will be required to maintain at least one paying agent in each Place
of Payment for such series and, if Convertible Debt Securities of a series are
issuable as Bearer Securities, NWA Corp. will be required to maintain a Paying
Agent in a Place of Payment outside the United States where Convertible Debt
Securities of such series and any coupons appertaining thereto may be presented
and surrendered for payment. NWA Corp. will have the right to require a holder
of any Convertible Debt Security, in connection with the payment of the
principal of, premium, if any, and interest, if any, on such Convertible Debt
Security, to certify information to NWA Corp. or, in the absence of such
certification, NWA Corp. will be entitled to rely on any legal
 
                                       6
<PAGE>
presumption to enable NWA Corp. to determine its duties and liabilities, if any,
to deduct or withhold taxes, assessments or governmental charges from such
payment.
 
    Unless otherwise provided in the applicable Prospectus Supplement,
Convertible Debt Securities in registered form will be transferable or
exchangeable at the agency of NWA Corp. maintained for such purpose as
designated by NWA Corp. from time to time. Convertible Debt Securities may be
transferred or exchanged without service charge, other than any tax or
governmental charge imposed in connection therewith.
 
    In the event of any redemption in part, NWA Corp. shall not be required to
(i) issue, register the transfer of or exchange Convertible Debt Securities of
any series during a period beginning at the opening of business 15 days before
any selection of Convertible Debt Securities of that series to be redeemed and
ending at the close of business on (A) if Convertible Debt Securities of the
series are issuable only as Registered Securities, the day of mailing of the
relevant notice of redemption and (B) if Convertible Debt Securities of the
series are issuable as Bearer Securities, the day of the first publication of
the relevant notice of redemption or, if Convertible Debt Securities of the
series are also issuable as Registered Securities and there is no publication,
the mailing of the relevant notice of redemption; (ii) register the transfer of
or exchange any Registered Securities, or portion thereof, called for redemption
or otherwise surrendered for repayment, except the unredeemed or unrepaid
portion of any Registered Security being redeemed or repaid in part; or (iii)
exchange any Bearer Security called for redemption, except to exchange such
Bearer Security for a Registered Security of that series and like tenor which is
immediately surrendered for redemption.
 
CONVERSION RIGHTS
 
    The terms on which Convertible Debt Securities of any series are convertible
into Class A Common Stock will be set forth in the Prospectus Supplement
relating thereto. Such terms shall include provisions as to whether conversion
is mandatory, at the option of the holder, or at the option of NWA Corp., and
may include provisions in which the number of shares of Class A Common Stock to
be received by the holders of Convertible Debt Securities would be calculated
according to the market price of Class A Common Stock as of a time stated in the
Prospectus Supplement.
 
SUBORDINATION OF CONVERTIBLE SUBORDINATED DEBT SECURITIES
 
    The obligation of NWA Corp. to make payment on account of the principal of,
and premium, if any, and interest on the Convertible Subordinated Debt
Securities will be subordinated and junior in right of payment, as set forth in
the Convertible Subordinated Indenture, to the prior payment in full of all
Senior Indebtedness. The Convertible Subordinated Debt Securities will rank PARI
PASSU with any future Indebtedness of NWA Corp. which by its terms states that
it will rank PARI PASSU with the Convertible Subordinated Debt Securities. The
Convertible Subordinated Debt Securities will rank senior to all other existing
and future subordinated Indebtedness or other subordinated obligations of NWA
Corp. Notwithstanding the foregoing, payment from the money or the proceeds of
U.S. Government Obligations held in any defeasance trust described under
"Defeasance" below is not subordinate to any Senior Indebtedness or subject to
the restrictions described herein.
 
    "Senior Indebtedness" means all Indebtedness of NWA Corp. (other than the
Convertible Subordinated Debt Securities) unless such Indebtedness, by its terms
or the terms of the instrument creating or evidencing it, is subordinate in
right of payment to or PARI PASSU with the Convertible Subordinated Debt
Securities; PROVIDED, HOWEVER, that Senior Indebtedness does not include (x) any
Indebtedness, guarantee or other obligation of NWA Corp. that is subordinate or
junior in any respect to any other Indebtedness of NWA Corp. or (y) any
Indebtedness of NWA Corp. to any of its Subsidiaries. "Indebtedness," when used
with respect to NWA Corp., means, without duplication, the principal of, and
premium, if any, and accrued and unpaid interest (including post-petition
interest, whether or not available as a claim in bankruptcy) on,
 
                                       7
<PAGE>
(i) indebtedness of NWA Corp. for money borrowed, (ii) Indebtedness guarantees
by NWA Corp. of indebtedness for money borrowed by any other person, (iii)
indebtedness of NWA Corp. evidenced by notes, debentures, bonds or other
instruments of indebtedness for payment of which NWA Corp. is responsible or
liable, (iv) obligations for the reimbursement of any obligor on any letter of
credit, bankers' acceptance or similar credit transaction, (v) obligations of
NWA Corp. under Capital Leases and Flight Equipment leases, (vi) obligations
under interest rate and currency swaps, caps, collars, options, forward or spot
contracts or similar arrangements or with respect to foreign currency hedges or
aircraft fuel hedges, (vii) commitment and other bank financing fees under
contractual obligations associated with bank debt, (viii) any indebtedness
representing the deferred and unpaid purchase price of any property or business,
and (ix) all deferrals, renewals, extensions and refundings of any such
indebtedness or obligations, PROVIDED, HOWEVER, that Indebtedness shall not
include amounts owed to trade creditors in the ordinary course of business,
nonrecourse indebtedness secured by real property located outside the United
States or operating lease rental payments (other than Flight Equipment lease
rental payments) in the ordinary course of business.
 
    No payment on account of principal of, or premium, if any, or interest on,
the Convertible Subordinated Debt Securities or deposit pursuant to the
provisions described under "Defeasance" below may be made if (i) any Senior
Indebtedness is not paid when due (following the expiration of any applicable
grace period) or (ii) any other default on Senior Indebtedness occurs and the
maturity of any Senior Indebtedness is accelerated in accordance with its terms
unless, in either case, (a) such failure to pay or acceleration relates to such
Senior Indebtedness in an aggregate amount equal to or less than $20 million,
(b) the default has been cured or waived or has ceased to exist, (c) such
acceleration has been rescinded, or (d) such Senior Indebtedness has been paid
in full. A failure to make any payment with respect to the Convertible
Subordinated Debt Securities as a result of the foregoing provisions will not
limit the right of the Holders of the Convertible Subordinated Debt Securities
to accelerate the maturity thereof as a result of such payment default.
 
    Upon any distribution of the assets of NWA Corp. upon any dissolution, total
or partial liquidation or reorganization of or similar proceeding relating to
NWA Corp., the holders of Senior Indebtedness will be entitled to receive
payment in full before the Holders of the Convertible Subordinated Debt
Securities are entitled to receive any payment. By reason of such subordination,
in the event of insolvency, creditors of NWA Corp. who are holders of Senior
Indebtedness or of other unsubordinated Indebtedness of NWA Corp. may recover
more, ratably, than the Holders of the Convertible Subordinated Debt Securities.
 
GLOBAL CONVERTIBLE DEBT SECURITIES
 
    The Convertible Debt Securities of a series may be issued in whole or in
part in the form of one or more fully registered global securities (a
"Registered Global Security") that will be deposited with a depositary (the
"Depositary") or with a nominee for the Depositary identified in the applicable
Prospectus Supplement. In such case, one or more Registered Global Securities
will be issued in a denomination or aggregate denominations equal to the portion
of the aggregate principal amount of outstanding Convertible Debt Securities of
the series to be represented by such Registered Global Security or Securities.
Unless and until it is exchanged in whole or in part for Convertible Debt
Securities in definitive certificated form, a Registered Global Security may not
be registered for transfer or exchange except as a whole by the Depositary for
such Registered Global Security to a nominee of such Depositary or by a nominee
of such Depositary to such Depositary or another nominee of such Depositary or
by such Depositary or any such nominee to a successor Depositary for such series
or a nominee of such successor Depositary and except in the circumstances
described in the applicable Prospectus Supplement.
 
    The specific terms of the depositary arrangement with respect to any portion
of a series of Convertible Debt Securities to be represented by a Registered
Global Security will be described in the applicable Prospectus Supplement. NWA
Corp. expects that the following provisions will apply to depositary
arrangements.
 
                                       8
<PAGE>
    Upon the issuance of any Registered Global Security, and the deposit of such
Registered Global Security with or on behalf of the Depositary for such
Registered Global Security, the Depositary will credit, on its book-entry
registration and transfer system, the respective principal amounts of the
Convertible Debt Securities represented by such Registered Global Security to
the accounts of institutions ("participants") that have accounts with the
Depositary or its nominee. The accounts to be credited will be designated by the
underwriters or agents engaging in the distribution of such Convertible Debt
Securities or by NWA Corp, if such Convertible Debt Securities are offered and
sold directly by NWA Corp. Ownership of beneficial interests in a Registered
Global Security will be limited to participants or persons that may hold
interests through participants. Ownership of beneficial interests by
participants in such Registered Global Security will be shown on, and the
transfer of that ownership interest will be effected only through, records
maintained by the Depositary for such Registered Global Security or by its
nominee. Ownership of beneficial interests in such Registered Global Security by
persons that hold through participants will be shown on, and the transfer of
that ownership interest within such participant will be effected only through,
records maintained by such participant. The laws of some jurisdictions require
that certain purchasers of securities take physical delivery of such securities
in certified form. The foregoing limitations and such laws may impair the
ability to transfer beneficial interests in such Registered Global Securities.
 
    So long as the Depositary for a Registered Global Security, or its nominee,
is the registered owner of such Registered Global Security, such Depositary or
such nominee, as the case may be, will be considered the sole owner or holder of
the Convertible Debt Securities represented by such Registered Global Security
for all purposes under the Indentures. Unless otherwise specified in the
applicable Prospectus Supplement and except as specified below, owners of
beneficial interests in such Registered Global Security will not be entitled to
have Convertible Debt Securities of the series represented by such Registered
Global Security registered in their names, will not receive or be entitled to
receive physical delivery of Convertible Debt Securities of such series in
certificated form and will not be considered the holders thereof for any
purposes under the Indentures. Accordingly, each person owing a beneficial
interest in such Registered Global Security must rely on the procedures of the
Depositary and, if such person is not a participant, on the procedures of the
participant through which such person owns its interest, to exercise any rights
of a holder under the Indentures. The Depositary may grant proxies and otherwise
authorize participants to give or take any request, demand, authorization,
direction, notice, consent, waiver or other action which a holder is entitled to
give or take under the Indentures. NWA Corp. understands that, under existing
industry practices, if NWA Corp. requests any action of holders or an owner of a
beneficial interest in such Registered Global Security desires to give any
notice or take any action a holder is entitled to give or take under the
Indentures, the Depositary would authorize the participants to give such notice
or take such action, and participants would authorize beneficial owners owning
through such participants to give such notice or take such action or would
otherwise act upon the instructions of beneficial owners owning through them.
 
    Unless otherwise specified in the applicable Prospectus Supplement, payments
with respect to principal, premium, if any, and interest, if any, on Convertible
Debt Securities represented by a Registered Global Security registered in the
name of a Depositary or its nominee will be made to such Depositary or its
nominee, as the case may be, as the registered owner of such Registered Global
Security.
 
    NWA Corp. expects that the Depositary for any Convertible Debt Securities
represented by a Registered Global Security, upon receipt of any payment of
principal, premium or interest, will immediately credit participants' accounts
with payments in amounts proportionate to their respective beneficial interests
in the principal amount of such Registered Global Security as shown on the
records of such Depositary. NWA Corp. also expects that payments by participants
to owners of beneficial interests in such Registered Global Security held
through such participants will be governed by standing instructions and
customary practices, as is now the case with the securities held for the
accounts of customers registered in "street names," and will be the
responsibility of such participants. None of NWA Corp., the Trustee or any
 
                                       9
<PAGE>
agent of NWA Corp. shall have any responsibility or liability for any aspect of
the records relating to or payments made on account of beneficial ownership
interests of a Registered Global Security, or for maintaining, supervising or
reviewing any records relating to such beneficial ownership interests.
 
    Unless otherwise specified in the applicable Prospectus Supplement, if the
Depositary for any Convertible Debt Securities represented by a Registered
Global Security is at any time unwilling or unable to continue as Depositary and
a successor Depositary is not appointed by NWA Corp. within 90 days, NWA Corp.
will issue such Convertible Debt Securities in definitive certificated form in
exchange for such Registered Global Security. In addition, NWA Corp. may at any
time and in its sole discretion determine not to have any of the Convertible
Debt Securities of a series represented by one or more Registered Global
Securities and, in such event, will issue Convertible Debt Securities of such
series in definitive certificated form in exchange for all of the Registered
Global Securities representing such Convertible Debt Securities. Further, if NWA
Corp. so specifies with respect to the Convertible Debt Securities of a series,
an owner of a beneficial interest in a Registered Global Security representing
Convertible Debt Securities of such series may, on terms acceptable to NWA Corp.
and the Depositary for such Registered Global Security, receive Convertible Debt
Securities of such series in definitive form registered in the name of such
beneficial owner or its designee.
 
CONSOLIDATION, MERGER OR SALE
 
    The Indentures provide that NWA Corp. may merge or consolidate with or into
any other corporation or sell, convey, transfer, lease or otherwise dispose of
all or substantially all of its assets to any Person, if (i) (a) in the case of
a merger or consolidation, NWA Corp. is the surviving corporation or (b) in the
case of a merger or consolidation where NWA Corp. is not the surviving
corporation and in the case of such a sale, conveyance, transfer or other
disposition, the resulting, successor or acquiring Person is a corporation
organized and existing under the laws of the United States of America or a State
thereof or the District of Columbia and such corporation expressly assumes by
supplemental indenture all the obligations of NWA Corp. under the Convertible
Debt Securities and any coupons appertaining thereto and under the Indentures,
(ii) immediately after giving effect to such merger or consolidation, or such
sale, conveyance, transfer, lease or other disposition (including, without
limitation, any Indebtedness directly or indirectly incurred or anticipated to
be incurred in connection with or in respect of such transaction), no Default or
Event of Default shall have occurred and be continuing and (iii) certain other
conditions are met. In the event a successor corporation assumes the obligations
of NWA Corp., such successor corporation shall succeed to and be substituted for
NWA Corp. under the Indentures and under the Convertible Debt Securities and any
coupons appertaining thereto and all obligations of NWA Corp. shall terminate.
In the event of any such permitted consolidation, merger, sale, conveyance,
disposition or other change of control transaction (including a highly leveraged
transaction), the holders of the Convertible Debt Securities will not have the
right to require redemption thereof or similar rights unless otherwise provided
in the applicable Prospectus Supplement.
 
EVENTS OF DEFAULT, NOTICE AND CERTAIN RIGHTS ON DEFAULT
 
    Events of Default with respect to Convertible Debt Securities of any series
issued thereunder are defined in the Indentures as being: default for thirty
days in payment of any interest on any Convertible Debt Security of that series
or any coupon appertaining thereto or any additional amount payable with respect
to Convertible Debt Securities of such series as specified in the applicable
Prospectus Supplement when due; default in payment of principal, premium, if
any, or on redemption or otherwise, or in the making of a mandatory sinking fund
payment of any Convertible Debt Securities of that series when due; default for
sixty days after notice to NWA Corp. by the Trustee for such series, or by the
holders of 25% in aggregate principal amount of the Convertible Debt Securities
of such series then outstanding, in the performance of any other agreement
applicable to the Convertible Debt Securities of that series, in the Indentures
or in any supplemental indenture or board resolution referred to therein under
which the
 
                                       10
<PAGE>
Convertible Debt Securities of that series may have been issued; and certain
events of bankruptcy, insolvency or reorganization of NWA Corp. or Northwest.
Any other Events of Default applicable to a specified series of Convertible Debt
Securities will be described in the applicable Prospectus Supplement. An Event
of Default with respect to a particular series of Convertible Debt Securities
will not necessarily be an Event of Default with respect to any other series of
Convertible Debt Securities.
 
    The Indentures provide that, if an Event of Default specified therein occurs
with respect to the Convertible Debt Securities of any series issued thereunder
and is continuing, the Trustee for such series or the holders of 25% in
aggregate principal amount of all of the outstanding Convertible Debt Securities
of that series, by written notice to NWA Corp. (and to the Trustee for such
series, if notice is given by such holders of Convertible Debt Securities), may
declare the principal (or, if the Convertible Debt Securities of that series are
original issue discount Convertible Debt Securities or indexed Convertible Debt
Securities, such portion of the principal amount specified in the applicable
Prospectus Supplement) of all the Convertible Debt Securities of that series to
be due and payable.
 
    The Indentures provide that the Trustee for any series of Convertible Debt
Securities shall, within ninety days after the occurrence of a Default known to
it with respect to Convertible Debt Securities of that series, give to the
holders of the Convertible Debt Securities of that series notice of all such
uncured Defaults; PROVIDED, that such notice shall not be given until 60 days
after the occurrence of a Default with respect to Convertible Debt Securities of
that series involving a failure to perform a covenant other than the obligation
to pay principal, premium, if any, or interest or make a mandatory sinking fund
payment; and PROVIDED FURTHER, that, except in the case of default in payment on
the Convertible Debt Securities of that series, the Trustee may withhold the
notice if and so long as a committee of its Responsible Officers (as defined
therein) in good faith determines that withholding such notice is in the
interest of the holders of the Convertible Debt Securities of that series.
"Default" means any event which is, or, after notice or passage of time or both,
would be, an Event of Default.
 
    The Indentures provide that the Trustee will be under no obligation to
exercise any of its rights or powers under such Indenture at the request or
direction of any of the Holders, unless such Holders shall have offered to the
Trustee reasonable indemnity. Subject to such provisions for indemnification of
the Trustee, the Indentures provide that the holders of not less than a majority
in aggregate principal amount of the Convertible Debt Securities of each series
affected (with each such series voting as a class) may direct the time, method
and place of conducting any proceeding for any remedy available to the Trustee
for such series, or exercising any trust or power conferred on such Trustee.
 
    The Indentures include a covenant that NWA Corp. will file annually with the
Trustee a certificate as to NWA Corp.'s compliance with all conditions and
covenants of the applicable Indenture.
 
    The holders of not less than a majority in aggregate principal amount of any
series of Convertible Debt Securities by notice to the Trustee for such series
may waive, on behalf of the holders of all Convertible Debt Securities of such
series, any past Default or Event of Default with respect to that series and its
consequences, and may rescind and annul a declaration of acceleration with
respect to that series (unless a judgment or decree based on such acceleration
has been obtained and entered), except a Default or Event of Default in the
payment of the principal of, premium, if any, or interest, if any, on any
Convertible Debt Security (and any acceleration resulting therefrom) and certain
other defaults.
 
MODIFICATION OF THE INDENTURES
 
    The Indentures contain provisions permitting NWA Corp. and the Trustee to
enter into one or more supplemental indentures without the consent of the
holders of any of the Convertible Debt Securities in order (i) to evidence the
succession of another corporation to NWA Corp. and the assumption of the
covenants of NWA Corp. by a successor; (ii) to add to the covenants of NWA Corp
or surrender any right or power of NWA Corp; (iii) to add additional Events of
Default with respect to any series; (iv) to add or change any provisions to such
extent as necessary to permit or facilitate the issuance of Convertible Debt
 
                                       11
<PAGE>
Securities in bearer form or in global form; (v) under certain circumstances to
add to, change or eliminate any provision affecting Convertible Debt Securities
not yet issued; (vi) to secure the Convertible Debt Securities; (vii) to
establish the form or terms of Convertible Debt Securities; (viii) to evidence
and provide for successor Trustees; (ix) if allowed without penalty under
applicable laws and regulations, to permit payment in respect of Convertible
Debt Securities in bearer form in the United States; (x) to correct or
supplement any inconsistent provisions or to make any other provisions with
respect to matters or questions arising under the Indentures, PROVIDED that such
action does not adversely affect the interests of any holder of Convertible Debt
Securities of any series issued under such Indentures in any material respect;
or (xi) to cure any ambiguity or correct any mistake.
 
    The Indentures also contain provisions permitting NWA Corp. and the Trustee,
with the consent of the holders of a majority in aggregate principal amount of
the outstanding Convertible Debt Securities of each series affected by such
supplemental indenture, to execute supplemental indentures adding any provisions
to or changing or eliminating any of the provisions of the Indentures or any
supplemental indenture or modifying the rights of the holders of Convertible
Debt Securities of such series, except that no such supplemental indenture may,
without the consent of the holder of each Convertible Debt Security so affected,
(i) change the time for payment of principal or interest on any Convertible Debt
Security; (ii) reduce the principal of, or any installment of principal of, or
interest on any Convertible Debt Security; (iii) reduce the amount of premium,
if any, payable upon the redemption of any Convertible Debt Security; (iv)
reduce the amount of principal payable upon acceleration of the maturity of an
Original Issue Discount Convertible Debt Security; (v) change the coin or
currency in which any Convertible Debt Security or any premium or interest
thereon is payable; (vi) impair the right to institute suit for the enforcement
of any payment on or with respect to any Convertible Debt Security; (vii) reduce
the percentage in principal amount of the outstanding Convertible Debt
Securities of any series the consent of whose holders is required for
modification or amendment of the Indentures or for waiver of compliance with
certain provisions of the Indentures or for waiver of certain defaults; (viii)
change the obligation of NWA Corp. to maintain an office or agency in the places
and for the purposes specified in the Indentures; or (ix) modify any of the
foregoing provisions.
 
DEFEASANCE
 
    If indicated in the applicable Prospectus Supplement, NWA Corp. may elect
either (i) to defease and be discharged from any and all obligations with
respect to the Convertible Debt Securities of or within any series (except as
described below) ("defeasance") or (ii) to be released from its obligations with
respect to certain covenants applicable to the Convertible Debt Securities of or
within any series ("covenant defeasance"), upon the deposit with the Trustee for
such series (or other qualifying trustee), in trust for such purpose, of money
and/or Government Obligations which through the payment of principal and
interest in accordance with their terms will provide money in the amount
sufficient to pay the principal of, premium, if any, and interest on such
Convertible Debt Securities to Maturity or redemption, as the case may be, and
any mandatory sinking fund or analogous payments thereon. Upon the occurrence of
a defeasance, NWA Corp. will be deemed to have paid and discharged the entire
indebtedness represented by such Convertible Debt Securities and any coupons
appertaining thereto and to have satisfied all of its other obligations under
such Convertible Debt Securities and any coupons appertaining thereto (except
for (i) the rights of holders of such Convertible Debt Securities to receive,
solely from the trust funds deposited to defease such Convertible Debt
Securities, payments in respect of the principal of, premium, if any, and
interest, if any, on such Convertible Debt Securities or any coupons
appertaining thereto when such payments are due and (ii) certain other
obligations as provided in the Indentures). Upon the occurrence of a covenant
defeasance, NWA Corp. will be released only from its obligations to comply with
certain covenants contained in the Indentures relating to such Convertible Debt
Securities, will continue to be obligated in all other respects under such
Convertible Debt Securities and will continue to be contingently liable with
respect to the payment of principal, interest, if any, and premium, if any, with
respect to such Convertible Debt Securities.
 
                                       12
<PAGE>
    Unless otherwise specified in the applicable Prospectus Supplement and
except as described below, the conditions to both defeasance and covenant
defeasance are as follows: (i) such defeasance or covenant defeasance must not
result in a breach or violation of, or constitute a Default or Event of Default
under, the Indentures, or result in a breach or violation of, or constitute a
default under, any other material agreement or instrument of NWA Corp.; (ii)
certain bankruptcy related Defaults or Events of Default with respect to NWA
Corp. must not have occurred and be continuing during the period commencing on
the date of the deposit of the trust funds to defease such Convertible Debt
Securities and ending on the 91st day after such date; (iii) NWA Corp. must
deliver to the Trustee an Opinion of Counsel to the effect that the holders of
such Convertible Debt Securities will not recognize income, gain or loss for
Federal income tax purposes as a result of such defeasance or covenant
defeasance and will be subject to Federal income tax on the same amounts and in
the same manner and at all the same times as would have been the case if such
defeasance or covenant defeasance had not occurred (such Opinion of Counsel, in
the case of defeasance, must refer to and be based upon a ruling of the Internal
Revenue Service or a change in applicable Federal income tax law occurring after
the date of the Indentures); (iv) NWA Corp. must deliver to the Trustee an
Officers' Certificate and an Opinion of Counsel with respect to compliance with
the conditions precedent to such defeasance or covenant defeasance and with
respect to certain registration requirements under the Investment Company Act of
1940, as amended; and (v) any additional conditions to such defeasance or
covenant defeasance which may be imposed on NWA Corp. pursuant to the
Indentures. The Indentures require that a nationally recognized firm of
independent public accountants deliver to the Trustee a written certification as
to the sufficiency of the trust funds deposited for the defeasance or covenant
defeasance of such Convertible Debt Securities. The Indentures do not provide
the holders of such Convertible Debt Securities with recourse against such firm.
If indicated in the applicable Prospectus Supplement, in addition to obligations
of the United States or an agency or instrumentality thereof, Government
Obligations may include obligations of the government or an agency or
instrumentality of the government issuing the currency in which Convertible Debt
Securities of such series are payable. In the event that Government Obligations
deposited with the Trustee for the defeasance of such Convertible Debt
Securities decrease in value or default subsequent to their being deposited, NWA
Corp. will have no further obligation, and the holders of such Convertible Debt
Securities will have no additional recourse against NWA Corp., as a result of
such decrease in value or default. As described above, in the event of a
covenant defeasance, NWA Corp. remains contingently liable with respect to the
payment of principal, interest, if any, and premium, if any, with respect to the
Convertible Debt Securities.
 
    NWA Corp. may exercise its defeasance option with respect to such
Convertible Debt Securities notwithstanding its prior exercise of its covenant
defeasance option. If NWA Corp. exercises its defeasance option, payment of such
Convertible Debt Securities may not be accelerated because of a Default or an
Event of Default. If NWA Corp. exercises its covenant defeasance option, payment
of such Convertible Debt Securities may not be accelerated by reason of a
Default or an Event of Default with respect to the covenants to which such
covenant defeasance is applicable. However, if such acceleration were to occur,
the realizable value at the acceleration date of the money and Government
Obligations in the defeasance trust could be less than the principal and
interest then due on such Convertible Debt Securities, in that the required
deposit in the defeasance trust is based upon scheduled cash flow rather than
market value, which will vary depending upon interest rates and other factors.
 
    The applicable Prospectus Supplement may further describe the provisions, if
any, applicable to defeasance or covenant defeasance with respect to the
Convertible Debt Securities of a particular series.
 
THE TRUSTEE
 
    State Street Bank & Trust Company, successor to The First National Bank of
Boston, is the Trustee under the Indentures. NWA Corp. and Northwest also
maintain banking and other commercial relationships with State Street Bank &
Trust Company, successor to The First National Bank of Boston, and its
affiliates in the ordinary course of business and State Street Bank & Trust
Company, successor to The First National Bank of Boston, acts as Trustee under
several other indentures for NWA Corp. and Northwest.
 
                                       13
<PAGE>
                            DESCRIPTION OF WARRANTS
 
    NWA Corp. may issue Warrants for the purchase of Class A Common Stock.
Warrants may be issued together with or separately from any Class A Common
Stock, Preferred Stock or debt securities of Northwest and, if issued together
with any of such securities, may be attached to or separate from such
securities. The Warrants are to be issued under one or more separate Warrant
Agreements (a "Warrant Agreement") to be entered into between NWA Corp. and
Norwest Bank Minnesota, N.A., as Warrant Agent, all as set forth in the
Prospectus Supplement relating to the particular issue of Warrants. The Warrant
Agent will act solely as an agent of NWA Corp. in connection with the Warrants
and will not assume any obligation or relationship of agency or trust for or
with any holders of Warrants or beneficial owners of Warrants. The statements
herein relating to the Warrants and the Warrant Agreements are summaries and
reference is made to the detailed provisions of the Warrant Agreements. A form
of Warrant Agreement has been filed as an exhibit to the Registration Statement.
 
GENERAL
 
    If Warrants are offered, reference is made to the applicable Prospectus
Supplement for a description of the specific terms of the Warrants being offered
thereby, including (i) the specific designation and aggregate number of such
Warrants, (ii) the offering price and the currency or composite currencies for
which Warrants may be purchased, (iii) the designation and aggregate number of
shares of Class A Common Stock purchasable upon exercise of the Warrants, (iv)
if applicable, the designation and terms of the securities with which the
Warrants are issued and the number of Warrants issued with the minimum
denomination or number of shares of each such security, (v) if applicable, the
date on and after which the Warrants and the related securities will be
separately transferable, (vi) the number of shares of Class A Common Stock
purchasable upon exercise of one Warrant and the price or the manner of
determining the price and currency or composite currencies or other
consideration for which such Class A Common Stock may be purchased upon such
exercise, (vii) the date on which the right to exercise the Warrants shall
commence and the date on which such right shall expire (the "Expiration Date"),
(viii) the terms of any mandatory or optional redemption by NWA Corp., (ix)
certain Federal income tax consequences, (x) whether the certificates for
Warrants will be issued in registered or unregistered form, and (xi) any other
special terms pertaining to such Warrants. Unless otherwise specified in the
applicable Prospectus Supplement, the Warrants will not be listed on any
securities exchange.
 
    Warrant certificates may be exchanged for new Warrant certificates of
different denominations, may (if in registered form) be presented for
registration of transfer and exchange and may be exercised at an office or
agency of the Warrant Agent maintained for that purpose (the "Warrant Agent
Office"). No service charge will be made for any transfer or exchange of Warrant
certificates, but NWA Corp. may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith. Prior to the
exercise of their Warrants, holders of Warrants will not have any of the rights
of holders of the Class A Common Stock purchasable upon such exercise.
 
    The Warrant Agent will act solely as an agent of Northwest in connection
with the Warrants and will not assume any obligation or relationship of agency
or trust for or with any holders of Warrants or beneficial owners of Warrants.
 
EXERCISE OF WARRANTS
 
    Each Warrant will entitle the holder to purchase such number of shares of
Class A Common Stock at such exercise price, for such consideration and during
such period or periods as shall in each case be set forth in, or calculable
from, the Prospectus Supplement relating to the Warrants. Warrants may be
exercised at any time during such period up to 5:00 P.M. New York City time on
the Expiration Date set forth in the Prospectus Supplement relating to such
Warrants. After the close of business on the Expiration
 
                                       14
<PAGE>
Date (or such later date to which such Expiration Date may be extended by NWA
Corp.), unexercised Warrants will become void.
 
    Warrants may be exercised by delivery to the Warrant Agent of payment as
provided in the applicable Prospectus Supplement of the amount required to
purchase the Class A Common Stock purchasable upon such exercise together with
certain information set forth on the reverse side of the Warrant certificate.
Unless otherwise provided in the applicable Prospectus Supplement, upon receipt
of such payment and the Warrant certificate properly completed and duly executed
at the Warrant Agent Office or any other office or agency indicated in the
applicable Prospectus Supplement, NWA Corp. will, as soon as practicable, issue
and deliver the Class A Common Stock purchasable upon such exercise. If fewer
than all of the Warrants represented by such Warrant certificate are exercised,
a new Warrant certificate will be issued for the amount of unexercised Warrants.
 
MODIFICATION OF WARRANT AGREEMENTS
 
    The Warrant Agreements contain a provision permitting NWA Corp. and the
Warrant Agent, without the consent of any Warrantholder, to supplement or amend
the Warrant Agreement in order to cure any ambiguity, and to correct or
supplement any provision contained therein which may be defective or
inconsistent with any other provisions or to make other provisions in regard to
matters or questions arising thereunder which NWA Corp. and the Warrant Agent
may deem necessary or desirable and which do not adversely affect the interests
of the Warrantholders.
 
THE WARRANT AGENT
 
    Norwest Bank Minnesota, N.A., will act as the Warrant Agent under the
Warrant Agreement. Northwest and NWA Corp. also maintain banking and other
commercial relationships with Norwest Bank Minnesota, N.A., and its affiliates
in the ordinary course of business.
 
                          DESCRIPTION OF CAPITAL STOCK
 
    The following descriptions and the descriptions contained in "Description of
Preferred Stock," "Description of Common Stock" and "Description of Series A,
Series B, Series C and Series D Preferred Stock and Rights" are summaries, and
reference is made to the provisions of NWA Corp.'s Restated Certificate of
Incorporation and bylaws and the agreements referred to in such descriptions,
copies of which have been filed as exhibits to the Registration Statement of
which this Prospectus is a part.
 
    The authorized capital stock of NWA Corp. consists of 360,020,000 shares, of
which 250,000,000 shares have been designated as Class A Common Stock,
65,000,000 shares have been designated as Class B Common Stock, and 45,020,000
shares have been designated as Preferred Stock. Of such authorized shares of
Preferred Stock, 10,000 shares have been designated Series A Preferred Stock,
$.01 par value per share (the "Series A Preferred Stock"), 10,000 shares have
been designated Series B Preferred Stock, $.01 par value per share (the "Series
B Preferred Stock"), 25,000,000 shares have been designated Series C Preferred
Stock, $.01 par value per share (the "Series C Preferred Stock"), 3,000,000
shares have been designated Series D Junior Participating Preferred Stock, $.01
par value per share (the "Series D Preferred Stock"), and 17,000,000 shares are
undesignated.
 
    The Preferred Stock has preference over the Common Stock with respect to the
payment of dividends and the distribution of assets in the event of a
liquidation or dissolution of the Company. In addition, the Board of Directors
of NWA Corp. has the authority to issue additional Preferred Stock in one or
more series and to fix the voting and other powers, designations, dividends,
preferences and relative, participating, optional, conversion, exchange,
redemption and other special rights and qualifications, limitations or
restrictions thereon of any such series of Preferred Stock.
 
                                       15
<PAGE>
                         DESCRIPTION OF PREFERRED STOCK
 
    The following description of the terms of the Preferred Stock offered hereby
sets forth certain general terms and provisions of the Preferred Stock to which
any Prospectus Supplement may relate. Certain terms of any series of the
Preferred Stock offered by any Prospectus Supplement will be described in the
Prospectus Supplement relating to such series of the Preferred Stock. If so
indicated in the applicable Prospectus Supplement, the terms of any such series
may differ from the terms set forth below. The descriptions of certain
provisions of the Preferred Stock set forth below and in any Prospectus
Supplement are summaries and reference is made to NWA Corp.'s Restated
Certificate of Incorporation and the Certificate of Designation relating to each
series of the Preferred Stock which will be filed with the Commission in
connection with the offering of such series of the Preferred Stock.
 
GENERAL
 
    Under NWA Corp.'s Restated Certificate of Incorporation, the Board of
Directors of NWA Corp. is authorized without further stockholder action to
provide for the issuance of up to 45,020,000 shares of Preferred Stock, par
value $.01 per share, in one or more series, with such voting and other powers,
designations, dividends, preferences and relative, participating, optional,
conversion, exchange, redemption and other special rights and qualifications,
limitations or restrictions therein, as shall be set forth in resolutions
providing for the issue thereof adopted by the Board of Directors. NWA Corp. may
amend from time to time its Restated Certificate of Incorporation to increase
the number of authorized shares of Preferred Stock or alter or change the
powers, preferences, privileges or rights of a series of Preferred Stock so as
to affect its holders adversely. Any such amendment would require the approval
of the holders of a majority of the outstanding shares of Common Stock, and the
approval of 66 2/3% of the outstanding shares of each affected series (or, in
the case of the Series C or Series D Preferred Stock, a majority of the
outstanding shares of Series C Preferred or Series D Stock, as applicable), in
the case of any adverse change in powers, preferences, privileges or rights. As
of July 31, 1996, 1,308.8 shares of Series A Preferred Stock, 2,163.2 shares of
Series B Preferred Stock, 6,442,360 shares of Series C Preferred Stock and no
shares of Series D Preferred Stock were outstanding.
 
    The Preferred Stock shall have the dividend, liquidation, redemption and
voting rights set forth below unless otherwise provided in the Prospectus
Supplement relating to a particular series of the Preferred Stock. Reference is
made to the Prospectus Supplement relating to the particular series of the
Preferred Stock offered thereby for specific terms, including: (i) the title and
stated value per share of such Preferred Stock and the number of shares offered;
(ii) the price at which such Preferred Stock will be issued; (iii) the dividend
rate (or method of calculation), if any, the dates on which dividends shall be
payable, whether such dividends shall be cumulative or noncumulative and, if
cumulative, the dates from which dividends shall commence to cumulate; (iv) any
redemption or sinking fund provisions of such Preferred Stock; and (v) any
additional dividend, liquidation, redemption, sinking fund and other rights,
preferences, privileges, limitations and restrictions of such Preferred Stock.
 
    The Preferred Stock will, when issued, be fully paid and nonassessable.
Unless otherwise specified in the Prospectus Supplement relating to a particular
series of the Preferred Stock, each series of the Preferred Stock offered hereby
will rank junior to the Series A and Series B Preferred Stock, will rank prior
to the Series C and Series D Preferred Stock and will rank on a parity in all
respects with each other series of the Preferred Stock. See "Description of
Series A, Series B, Series C and Series D Preferred Stock and Rights."
 
DIVIDEND RIGHTS
 
    Holders of the Preferred Stock of each series offered hereby will be
entitled to receive, when, as and if declared by the Board of Directors of NWA
Corp., out of assets of NWA Corp. legally available therefor, cash dividends at
such rates and on such dates, if any, as are set forth in the Prospectus
Supplement
 
                                       16
<PAGE>
relating to such series of the Preferred Stock. Such rate may be fixed or
variable or both. Each such dividend will be payable to the holders of record as
they appear on the stock books of NWA Corp. on such record dates as will be
fixed by the Board of Directors of NWA Corp. or a duly authorized committee
thereof. Dividends on any series of the Preferred Stock may be cumulative or
noncumulative, as provided in the Prospectus Supplement relating thereto. If the
Board of Directors of NWA Corp. fails to declare a dividend payable on a
dividend payment date on any series of the Preferred Stock for which dividends
are noncumulative, then the rights to receive a dividend in respect of the
dividend period ending on such dividend payment date will be lost, and NWA Corp.
shall have no obligation to pay the dividend accrued for that period, whether or
not dividends are declared for any future period.
 
    No full dividends will be declared or paid or set apart for payment on the
Preferred Stock of any series ranking, as to dividends, on a parity with or
junior to any other series of Preferred Stock for any period unless full
dividends have been or contemporaneously are declared and paid, or declared and
a sum sufficient for the payment thereof set apart for such payment, on such
other series of Preferred Stock for the then-current dividend payment period
and, if such other Preferred Stock is cumulative, all other dividend payment
periods terminating on or before the date of payment of such full dividends.
When dividends are not paid in full upon any series of the Preferred Stock and
any other Preferred Stock ranking on a parity as to dividends with such series
of the Preferred Stock, all dividends declared upon such series of the Preferred
Stock and any other Preferred Stock ranking on a parity as to dividends will be
declared pro rata so that the amount of dividends declared per share on such
series of the Preferred Stock and such other Preferred Stock will in all cases
bear to each other the same ratio that accrued dividends per share on such
series of the Preferred Stock and such other Preferred Stock bear to each other.
Except as provided in the preceding sentence, unless full dividends, including,
in the case of cumulative Preferred Stock, accumulations, if any, in respect of
prior dividend payment periods, on all outstanding shares of any series of the
Preferred Stock have been paid, no dividends (other than in shares of Common
Stock or another stock ranking junior to such series of the Preferred Stock as
to dividends and upon liquidation) will be declared or paid or set aside for
payment or other distributions made upon the Common Stock or any other stock of
NWA Corp. ranking junior to or on a parity with such series of the Preferred
Stock as to dividends or upon liquidation, nor will any Common Stock or any
other stock of NWA Corp. ranking junior to or on a parity with such series of
the Preferred Stock as to dividends or upon liquidation be redeemed, purchased
or otherwise acquired for any consideration (or any moneys be paid to or made
available for a sinking fund for the redemption of any shares of any such stock)
by NWA Corp., PROVIDED that NWA Corp. may at any time redeem, purchase or
otherwise acquire any such shares with shares of any stock ranking junior
(either as to dividends or upon liquidation) to such series of the Preferred
Stock. No interest, or sum of money in lieu of interest, shall be payable in
respect of any dividend payment or payments which may be in arrears.
 
    The amount of dividends payable for each dividend period will be computed by
annualizing the applicable dividend rate and dividing by the number of dividend
periods in a year, except that the amount of dividends payable for the initial
dividend period or any period shorter than a full dividend period shall be
computed on the basis of a 30-day month, a 360-day year and the actual number of
days elapsed in the period.
 
    Each series of the Preferred Stock will be entitled to dividends as
described in the Prospectus Supplement relating to such series, which may be
based upon one or more methods of determination. Different series of the
Preferred Stock may be entitled to dividends at different rates or based upon
different methods of determination.
 
RIGHTS UPON LIQUIDATION
 
    In the event of any voluntary or involuntary liquidation, dissolution or
winding up of NWA Corp., the holders of each series of the Preferred Stock
offered hereby will be entitled to receive out of assets of NWA Corp. available
for distribution to stockholders, before any distribution of assets is made to
holders
 
                                       17
<PAGE>
of Common Stock or any other class of stock ranking junior to such series of the
Preferred Stock upon liquidation, liquidating distributions in the amount set
forth in the Prospectus Supplement relating to such series of the Preferred
Stock plus an amount equal to accrued and unpaid dividends for the then-current
dividend period and, if such series of the Preferred Stock is cumulative, for
all dividend periods prior thereto. If, upon any voluntary or involuntary
liquidation, dissolution or winding up of NWA Corp., the amounts payable with
respect to the Preferred Stock of any series and any other shares of stock of
NWA Corp. ranking as to any such distribution on a parity with such series of
the Preferred Stock are not paid in full, the holders of the Preferred Stock of
such series and of such other shares will share ratably in any such distribution
of assets of NWA Corp. in proportion to the full respective preferential amounts
to which they are entitled. After payment of the full amount of the liquidating
distribution to which they are entitled, the holders of such series of the
Preferred Stock will have no right or claim to any of the remaining assets of
NWA Corp. Neither the sale of all or substantially all of the property or
business of NWA Corp. nor the merger or consolidation of NWA Corp. into or with
any other corporation shall be deemed to be a dissolution, liquidation or
winding up, voluntarily or involuntarily, of NWA Corp.
 
REDEMPTION
 
    A series of the Preferred Stock may be redeemable, in whole or in part, at
the option of NWA Corp., and may be subject to mandatory redemption pursuant to
a sinking fund, in each case upon terms, at the times and at the redemption
prices set forth in the Prospectus Supplement relating to such series.
 
    The Prospectus Supplement relating to a series of the Preferred Stock which
is subject to mandatory redemption shall specify the number of shares of such
series of the Preferred Stock which shall be redeemed by NWA Corp. in each year
commencing after a date to be specified, at a redemption price per share to be
specified, together with an amount equal to any accrued and unpaid dividends
thereon to the date of redemption. The redemption price may be payable in cash,
in capital stock or in cash received from the net proceeds of the issuance of
capital stock of NWA Corp., as specified in the Prospectus Supplement relating
to such series of the Preferred Stock.
 
    If fewer than all the outstanding shares of the Preferred Stock are to be
redeemed, whether by mandatory or optional redemption, the selection of the
shares to be redeemed shall be determined by lot or pro rata as may be
determined by the Board of Directors of NWA Corp. (or a duly authorized
committee thereof) or by any other method which may be determined by the Board
of Directors (or such committee) to be equitable. From and after the redemption
date (unless default shall be made by NWA Corp. in providing for the payment of
the redemption price), dividends shall cease to accrue on the shares of the
Preferred Stock called for redemption and all rights of the holders thereof
(except the right to receive the redemption price) shall cease.
 
    Notice of redemption shall be given by mailing the same to each record
holder of the shares to be redeemed, not less than 40 nor more than 70 days
prior to the date fixed for redemption thereof, to the respective addresses of
such holders as the same shall appear on NWA Corp.'s stock books. Each such
notice shall state: (i) the redemption date; (ii) the number of shares and
series of the Preferred Stock to be redeemed; (iii) the redemption price and the
manner in which such redemption price is to be paid and delivered; (iv) the
place or places where certificates for such shares of the Preferred Stock are to
be surrendered for payment of the redemption price; and (v) that dividends on
the shares to be redeemed will cease to accrue on such redemption date. If fewer
than all shares of any series of the Preferred Stock held by any holder are to
be redeemed, the notice mailed to such holder shall also specify the number of
shares to be redeemed from such holder.
 
    In the event that full dividends, including accumulations in the case of
cumulative Preferred Stock, on any series of the Preferred Stock have not been
paid, such series of the Preferred Stock may not be redeemed in part and NWA
Corp. may not purchase or acquire any shares of such series of the Preferred
 
                                       18
<PAGE>
Stock otherwise than pursuant to a purchase or exchange offer made on the same
terms to all holders of such series of the Preferred Stock.
 
VOTING RIGHTS
 
    Except as indicated below or in the Prospectus Supplement relating to a
particular series of the Preferred Stock, or except as expressly required by
applicable law, the holders of the Preferred Stock will not be entitled to vote.
Except as indicated in the Prospectus Supplement relating to a particular series
of the Preferred Stock, when and if any such series is entitled to vote, each
share in such series will be entitled to one vote.
 
    The affirmative vote or consent of the holders of 66 2/3% of the outstanding
shares of any series of the Preferred Stock offered hereby, voting separately as
a class with all other affected series of Preferred Stock of NWA Corp. ranking
on a parity with such series of the Preferred Stock as to dividends or upon
liquidation, dissolution or winding up ("Parity Stock"), will be required for
any amendment of NWA Corp.'s Restated Certificate of Incorporation (or any
certificate amendatory thereof or supplemental thereto relating to any series of
the Preferred Stock) which alters or changes the powers, preferences, privileges
or rights of such series of the Preferred Stock so as to materially adversely
affect the holders thereof. The affirmative vote or consent of the holders of
shares representing 66 2/3% of the outstanding shares of any series of the
Preferred Stock offered hereby and any other series of Parity Stock, voting as a
single class without regard to series, will be required to authorize the
creation or issuance of, or reclassify any authorized stock of NWA Corp. into,
or issue or authorize any obligation or security convertible into or evidencing
a right to purchase, any additional class or series of stock ranking prior to
such series of the Preferred Stock as to dividends or upon liquidation,
dissolution or winding up.
 
CONVERSION AND EXCHANGE
 
    The terms, if any, on which shares of any series of the Preferred Stock are
convertible into Class A Common Stock or exchangeable for Convertible Debt
Securities will be set forth in the Prospectus Supplement relating thereto. Such
terms may include provisions for conversion, either mandatory, at the option of
the holder, or at the option of NWA Corp., in which the number of shares of
Class A Common Stock to be received by the holders of the Preferred Stock would
be calculated according to the market price of Class A Common Stock as of a time
stated in the applicable Prospectus Supplement.
 
                          DESCRIPTION OF COMMON STOCK
 
CLASS A COMMON STOCK
 
    As of July 31, 1996 there were 107,985,643 shares of Class A Common Stock
outstanding, which includes all of the shares of Class A Common Stock issued or
to be issued to the Employee Trusts pursuant to the Equity Letter Agreements.
Each share of Class A Common Stock is entitled to one vote at all meetings of
stockholders of the Company for the election of directors (other than directors
elected by holders of Preferred Stock) and all matters submitted to stockholder
vote, except as otherwise specified in the following sentence and below under
"Foreign Ownership of Shares." As a result of the exercise of the Special
Conversion Option by certain employee groups (as described below under
"Description of Series A, Series B, Series C and Series D Preferred Stock and
Rights--Series C Preferred Stock-- Conversion Rights"), a subseries of Class A
Common Stock was created (the "Special Voting Class A Common") and (A) prior to
October 29, 1996, each share of such subseries is entitled to the number of
votes per share equal to (1) the total number of shares of Special Voting Class
A Common held or to be received by a Qualified Holder (as defined below under
"Description of Series A, Series B, Series C and Series D Preferred Stock and
Rights--Series C Preferred Stock") pursuant to the exercise of the Special
Conversion Option of the Series C Preferred Stock, divided by (2) the total
number of shares of Special Voting Class A Common then held by such Qualified
Holder, and (B) on and after October 29, 1996, all
 
                                       19
<PAGE>
such outstanding shares of Special Voting Class A Common will, without the
action of any holder thereof, be converted into an equal number of shares of
Class A Common Stock. On February 9, 1994, certain employee groups that would
have otherwise been entitled to receive 9,309,293 shares of Series C Preferred
Stock exercised the Special Conversion Option, and consequently the Employee
Trusts for such employee groups will receive 16,900,343 shares of Special Voting
Class A Common Stock in lieu of Series C Preferred Stock.
 
    Holders of the Class A Common Stock and Class B Common Stock participate
equally as to any dividends or other distributions, except that dividends
payable in shares of Common Stock (or securities to acquire Common Stock) are
paid in Common Stock (or securities to acquire Common Stock) of the same class
as that held by the recipient of the dividend. The payment of dividends is
subject to many restrictions. See "Dividend Policy." Upon any liquidation,
dissolution or winding up of the Company, holders of the Class A Common Stock
are entitled to share equally and ratably with the holders of Class B Common
Stock in the assets of the Company, if any, remaining after the payment of all
debts and liabilities of the Company and the liquidation preference of any
outstanding Preferred Stock. Other than certain rights held by KLM to subscribe
for shares to maintain its voting interest in the Company (see "Corporate
Governance and Control--Stockholders' Agreements"), holders of Class A Common
Stock have no preemptive, subscription or redemption rights and are not subject
to further calls or assessments. Holders of Class A Common Stock have no right
to cumulate their votes in the election of directors.
 
    The Class A Common Stock is convertible into the Class B Common Stock on a
share-for-share basis. However, Class A Common Stock may not be converted if
immediately after such conversion Northwest would be deemed not to be a United
States Citizen under the Federal Aviation Act of 1958 (the "Federal Aviation
Act"). In particular and without any limitation of the foregoing, no holder of
Class A Common Stock may convert any share of that class to the extent that as a
result of such conversion, the voting interest in the Company owned or
controlled by non-U.S. citizens in the aggregate would exceed 25% of the voting
interest in the Company or such other percentage that would exceed federal
ownership restrictions.
 
    If the voting interest in the Company owned or controlled by non-U.S.
citizens exceeds the 25% voting interest limit or results in Northwest no longer
being deemed a United States Citizen by the U.S. Department of Transportation
(the "DOT"), the Company is required by its Restated Certificate of
Incorporation to cause Class A Common Stock held by non-U.S. citizens to be
converted into nonvoting Class B Common Stock to the extent necessary to reduce
the voting interest in the Company owned or controlled by non-U.S. citizens to
the highest amount that (i) does not exceed the 25% voting interest limit and
(ii) would reinstate Northwest as a United States Citizen.
 
    The Class A Common Stock is quoted on the Nasdaq National Market. The
transfer agent and registrar for the Class A Common Stock is Norwest Bank
Minnesota, N.A.
 
CLASS B COMMON STOCK
 
    As of July 31, 1996, there were 3,931,286 shares of Class B Common Stock
outstanding, which includes all of the shares of Class B Common Stock issued or
to be issued to the Employee Trusts pursuant to the Equity Letter Agreements.
Except as otherwise required by law, the holders of Class B Common Stock have no
right to vote on any matters to be voted on by the Company's stockholders.
Holders of the Class A Common Stock and Class B Common Stock participate equally
as to any dividends or other distributions, except that dividends payable in
shares of Common Stock (or securities to acquire Common Stock) are paid in
Common Stock (or securities to acquire Common Stock) of the same class as that
held by the recipient of the dividend. Upon any liquidation, dissolution or
winding up of the Company, holders of Class B Common Stock are entitled to share
equally and ratably with the holders of the Class A Common Stock in the assets
of the Company, if any, remaining after the payment of all debts and liabilities
of the Company and the liquidation preference of any outstanding Preferred
Stock. Other than certain
 
                                       20
<PAGE>
rights held by KLM to subscribe for shares to maintain its voting interest in
the Company (see "Corporate Governance and Control--Stockholders' Agreements"),
holders of Class B Common Stock have no preemptive, subscription or redemption
rights and are not subject to further calls or assessments. The Class B Common
Stock is convertible into Class A Common Stock on a share-for-share basis,
except that the Employee Trusts and Qualified Holders may only convert Class B
Common Stock into Class A Common Stock at such time and in such amounts as is
necessary to preserve the ratio of the number of outstanding shares of Class A
Common Stock then outstanding to the number of shares of outstanding Class B
Common Stock issued to Original Investors. In addition, Class B Common Stock may
not be converted if immediately after such conversion Northwest would be deemed
not to be a United States Citizen under the Federal Aviation Act. In particular
and without any limitation of the foregoing, no holder of Class B Common Stock
may convert any share of that class to the extent that, as a result of such
conversion, the voting interest in the Company owned or controlled by non-U.S.
citizens in the aggregate would exceed 25% of the voting interest in the Company
or such other percentage that would exceed federal foreign ownership
restrictions. See "Foreign Ownership of Shares." In addition, Class B Common
Stock held by a bank holding company or an affiliate thereof may not be
converted into shares of Class A Common Stock if immediately after such
conversion that entity and its affiliates would own more than 4.9% of any class
of voting securities of the Company, subject to certain exceptions.
 
    The Class B Common Stock is not listed on any securities exchange or
approved for quotation on any interdealer quotation system.
 
            DESCRIPTION OF SERIES A, SERIES B, SERIES C AND SERIES D
                           PREFERRED STOCK AND RIGHTS
 
SERIES A PREFERRED STOCK
 
    As of July 31, 1996, 1,308.8 shares of Series A Preferred Stock were
outstanding, all of which were held by KLM and by a trust for the benefit of
KLM. Each share of Series A Preferred Stock is entitled to a preference in
voluntary and involuntary liquidation in the amount of $50,000 per share, plus
accrued and unpaid dividends. Each share of Series A Preferred Stock is entitled
to one vote at all meetings of stockholders of the Company for the election of
directors (other than directors elected by the holders of Series C Preferred
Stock).
 
    The Company is obligated to redeem the Series A Preferred Stock, including
accrued and unpaid dividends, in three equal annual installments on August 1,
2000, 2001 and 2002. The dividend rate on the Series A Preferred Stock is 8% per
annum on the per share liquidation amount. Dividends accrue semi-annually during
the five-year period commencing on August 1, 1993 and are subsequently payable
upon redemption of the Series A Preferred Stock. After August 1, 1998 (at which
date the aggregate liquidation preference of the Series A Preferred Stock is
expected to be approximately $425 million), dividends are payable in cash. To
the extent cash dividends are not paid when due, the annual dividend rate will
increase by 0.5% every six months with a maximum dividend rate of 10%. Cash
dividends are cumulative if unpaid.
 
    The Series A Preferred Stock ranks senior to the Series B, Series C and
Series D Preferred Stock and all classes of Common Stock with respect to
liquidation and dividend rights. At any time, at the option of the Company, the
Series A Preferred Stock is redeemable (in whole only). All outstanding shares
of Series A Preferred Stock must have been previously redeemed before an
optional redemption of any Series B or Series C Preferred Stock is permitted.
 
    In the event that the Company is in default with respect to payment on the
shares of Series A Preferred Stock, and if, as a result of the Company's failure
to redeem the Series C Preferred Stock in accordance with its terms, additional
Series C Directors are added to the Board of Directors as the representative of
such defaulted series, then a majority of the holders of the Series A Preferred
Stock, voting as a separate series, will, if such series is in default,
thereupon be entitled to elect one additional director as the representative of
such defaulted series.
 
                                       21
<PAGE>
SERIES B PREFERRED STOCK
 
    As of July 31, 1996, 2,163.2 shares of Series B Preferred Stock were
outstanding. Of such shares, 436.2 shares were beneficially owned by KLM and
1,727 shares were owned by Blum.
 
    Each share of Series B Preferred Stock is entitled to a preference in
voluntary and involuntary liquidation in the amount of $50,000 per share, plus
accrued and unpaid dividends. Each share of Series B Preferred Stock is entitled
to one vote at all meetings of stockholders of the Company for the election of
directors (other than directors elected by the holders of Series C Preferred
Stock).
 
    The Company is obligated to redeem the Series B Preferred Stock, including
accrued and unpaid dividends, in three equal annual installments on August 1,
2001, 2002 and 2003. The dividend rate on the Series B Preferred Stock is 8% per
annum on the per share liquidation amount. Dividends accrue semi-annually during
the five-year period commencing on August 1, 1993 and are subsequently payable
upon redemption of the Series B Preferred Stock. After August 1, 1998 (at which
date the aggregate liquidation preference of the Series B Preferred Stock is
expected to be approximately $380 million), dividends are payable in cash. To
the extent cash dividends are not paid when due, the annual dividend rate will
increase by 0.5% every six months with a maximum dividend rate of 10%. Cash
dividends are cumulative if unpaid.
 
    The Series B Preferred Stock ranks junior to the Series A Preferred Stock
and senior to the Series C and Series D Preferred Stock and all classes of
Common Stock with respect to liquidation and dividend rights. At any time at the
option of the Company, the Series B Preferred Stock is redeemable (in whole or
in $50 million increments). All outstanding shares of Series A Preferred Stock
must have been previously redeemed before an optional redemption of any Series B
or Series C Preferred Stock is permitted. All outstanding shares of Series B
Preferred Stock must have been previously redeemed before an optional redemption
of any Series C Preferred Stock is permitted.
 
    In the event that the Company is in default with respect to payment of the
shares of Series B Preferred Stock, and if, as a result of the Company's failure
to redeem the Series C Preferred Stock in accordance with its terms, additional
Series C Directors are added to the Board of Directors, then a majority of the
holders of the Series B Preferred Stock, voting as a separate series, will, if
such series is in default, thereupon be entitled to elect one additional
director as the representative of such defaulted series.
 
SERIES C PREFERRED STOCK
 
    GENERAL
 
    Pursuant to Equity Letter Agreements entered into by the Company with the
several unions representing the Company's employees, the Company agreed to
contribute in installments to the Employee Trusts for the benefit of its
employees (including management and certain other employees not represented by
any union) 18,214,419 shares of Series C Preferred Stock. The Employee Trusts
were established under the Northwest Airlines Corporation Employee Stock Plan
(the "Plan"), which is a qualified profit-sharing plan for purposes of ERISA.
The Company agreed to issue such shares as part of an overall revised
compensation plan for the Company's employees.
 
    CONVERSION RIGHTS
 
    Each share of Series C Preferred Stock is convertible at any time prior to
redemption into 1.3640 shares of Common Stock, currently consisting of 1.2967
shares of Class A Common Stock and 0.0673 shares of Class B Common Stock. The
respective number of shares of Class A and Class B Common Stock issuable upon
conversion will be adjusted to the extent necessary to correspond to the then
existing ratio of Class A Common Stock to Class B Common Stock issued to
Original Investors.
 
    The Equity Letter Agreements also provided for a "Special Conversion Option"
which, if elected, would result in the relevant Employee Trusts receiving Common
Stock at the rate of 1.9096 shares of
 
                                       22
<PAGE>
Common Stock (rather than 1.3640) for each share of Series C Preferred Stock
that they would otherwise receive. The Special Conversion Option expired on
February 9, 1994. On that day, certain employee groups elected to exercise the
Special Conversion Option. As a result, the total stock to be contributed to the
Employee Trusts, based on current projections, consists of 8,905,126 shares of
Series C Preferred Stock, 16,900,343 shares of Special Voting Class A Common
Stock and 876,682 shares of Class B Common Stock, which in the aggregate
represents 22.7% of the Company's voting shares outstanding as of July 31, 1996.
 
    The Employee Trusts and Qualified Holders may only convert Class B Common
Stock into Class A Common Stock at such time and in such amounts as is necessary
to preserve the ratio of the number of outstanding shares of Class A Common
Stock then outstanding to the number of shares of outstanding Class B Common
Stock issued to Original Investors. Upon any sale or transfer by a Qualified
Holder to a person who is not a Qualified Holder of shares of Series C Preferred
Stock or shares of Class B Common Stock received upon conversion of such Series
C Preferred Stock, such shares will automatically convert into shares of Class A
Common Stock.
 
    PUT RIGHT
 
    During the 60-day period ending ten years after August 1, 1993 (the "Put
Date"), the Employee Trusts and other "Qualified Holders" of the Series C
Preferred Stock (generally consisting of current and former Northwest employees
and their spouses, children and heirs) will have the right to put such stock to
the Company. Prior to the commencement of such 60-day period, the Company will
have the right to elect either (i) to repurchase such Series C Preferred Stock
with cash equal to the Put Price (defined below) or with shares of Class A
Common Stock having an aggregate trading value (based on the average closing
prices for Class A Common Stock during the 30-day period ending on the Put Date)
equal to the Put Price, or (ii) to permit the relevant Employee Trust or
Qualified Holder either (A) to receive the number of shares of Common Stock into
which such Series C Preferred Stock would otherwise then be convertible plus the
"Excess Amount" (as defined below) in cash, or (B) to have such number of shares
of Common Stock otherwise issuable upon conversion sold by the Company,
whereupon the relevant Employee Trust or Qualified Holder would receive in cash
the proceeds realized upon such sale plus the Excess Amount.
 
    Notwithstanding the foregoing, any election by the Company to provide those
exercising put rights with shares of Common Stock in lieu of cash (as described
in clause (i) above) would require the approval of a majority of the Series C
Directors (such directors being described under "Voting Rights" below). Any
decision by the Company not to repurchase any shares of Series C Preferred Stock
as described above requires the consent of a majority of the Series C Directors.
 
    The "Put Price" in 2003 of the Series C Preferred Stock will be equal to an
estimated $381 million (which is the estimated actual labor cost savings based
on the Company's current operating plan, reduced by the portion of such actual
labor cost savings that would have been applicable to those shares of Series C
Preferred Stock that have been converted), divided by the number of shares of
Series C Preferred Stock issued by the Company, plus accrued and unpaid
dividends on the Series C Preferred Stock, if any. The actual labor cost savings
is calculated as the excess of the amount the Company would have paid its
employees in basic hourly wages during the period covered by the labor cost
savings absent the labor cost savings over the amount actually paid, together
with certain savings in respect of reduced vacation accruals and certain work
rule changes.
 
    The "Excess Amount" for each share of Series C Preferred Stock as to which
the put right is exercised (which Excess Amount may be payable when the Company
has elected the mechanism described in clause (ii) of the third preceding
paragraph) is equal to the excess of (i) the Put Price over (ii) the specified
market price per share of the Class A Common Stock received pursuant to such
clause (ii), multiplied by the number of shares of Common Stock into which one
share of Series C Preferred Stock may then be converted.
 
                                       23
<PAGE>
    In the event the Company fails to fulfill its mandatory redemption
obligations as described above, on a quarterly basis thereafter the Company must
use all cash held by the Company (or available under revolving credit
agreements) in excess of all the Company's then currently anticipated cash needs
for operations and capital requirements within one year of such determination
date ("Available Cash") to make partial pro rata redemptions, provided such
redemptions are not prohibited under applicable credit agreements or the
Certificate of Designation for the Series A Preferred Stock or the Series B
Preferred Stock. Cash held by NWA Corp.'s subsidiaries will be included in the
calculation of Available Cash only to the extent such cash is made available to
NWA Corp. pursuant to applicable law or any loan agreements or instruments to
which NWA Corp. or any of its subsidiaries is a party or is subject.
 
    DIVIDENDS
 
    The "Dividend Date" for the Series C Preferred Stock is August 1 of each
year. If the Class A Common Stock is listed on the New York or American Stock
Exchange or quoted on the National Association of Securities Dealers Automated
Quotations System on the business day preceding a Dividend Date, no dividend
will accrue on the Series C Preferred Stock in respect of the year then ended.
If the Class A Common Stock is not so listed or quoted on such business day, on
the following Dividend Date each share of Series C Preferred Stock will accrue a
cumulative dividend for the year then ended equal to 5% of (i) the actual labor
cost savings realized by the Company from August 1, 1993 to such Dividend Date
plus the aggregate amount of previously accrued dividends on such Series C
Preferred Stock, divided by (ii) the total number of shares of Series C
Preferred Stock being issued by the Company. Because the Class A Common Stock is
approved for quotation on the Nasdaq National Market, no dividends have accrued
on the Series C Preferred Stock.
 
    In the event the Company fails to fulfill its mandatory redemption
obligation described above, as of the Put Date the Series C Preferred Stock will
begin to accrue a cumulative dividend payable quarterly at a rate equal to the
greater of 12% per annum or the highest default dividend rate then payable on
any series of Preferred Stock of the Company.
 
    VOTING RIGHTS
 
    The Series C Preferred Stock will vote in parity with the Class A Common
Stock on all matters submitted to stockholders for vote, except that with
respect to the election of directors the Series C Preferred Stock has the
special voting rights described below. Each share of Series C Preferred Stock
will have a number of votes equal to (i) (A) the total number of shares of
Series C Preferred Stock issued or to be issued by the Company or, if greater,
the number of shares of Class A Common Stock into which all such shares of
Series C Preferred Stock (including any shares of Series C Preferred Stock not
yet issued or already converted) would be convertible at such time under the
Equity Letter Agreements, minus (B) the total number of shares of Series C
Preferred Stock which prior to that time have been converted into shares of
Common Stock or, if greater, the number of shares of Class A Common Stock into
which those shares would be convertible at that time if they had not previously
been converted, divided by (ii) the total number of shares of Series C Preferred
Stock then outstanding. While the final contribution of stock to the Employee
Trusts is not scheduled to occur until March 1997, as a result of the special
voting rights of the Series C Preferred Stock, the outstanding shares have the
right to vote as if all shares of Series C Preferred Stock to be issued to the
Employee Trusts have been issued.
 
    With respect to the election of directors, the Series C Preferred Stock
voting as a separate class is entitled to elect three Series C Directors, one of
whom is to be nominated by the International Brotherhood of Teamsters,
Chauffeurs, Warehousemen and Helpers of America ("IBT"), one by the
International Association of Machinists and Aerospace Workers ("IAM") and one by
the Northwest Master Executive Council (the "Northwest MEC") of the Air Line
Pilots Association International ("ALPA"). In addition, until July 31, 2003, the
number of Series C Directors will be the greater of three or the number that
represents at least 15% of the Company's directors.
 
                                       24
<PAGE>
    In the event the Company fails to fulfill its mandatory redemption
obligation described above, the number of Series C Directors will be increased
to the greater of (i) three more than the number of Series C Directors then
serving on the Company's Board of Directors, and (ii) the number of directors
that would cause the proportion of Series C Directors to the total number of
directors to be equal to the proportion of the total voting power of all shares
of Series C Preferred Stock then outstanding to the total voting power of all
shares of all voting capital stock of the Company then outstanding.
 
    If the holders of Series C Preferred Stock are entitled to elect more than
three directors, the Northwest MEC, the IBT and the IAM will each be entitled to
nominate one-third of the Series C Directors, and if the total number of Series
C Directors is not a multiple of three, any remaining Series C Directors will be
nominated by a unanimous vote of the existing Series C Directors designated by
these three unions.
 
    Holders of Series C Preferred Stock will not be entitled to vote such stock
for the election of any directors other than the Series C Directors. The
entitlement of the holders of Series C Preferred Stock to elect the Series C
Directors will expire on the first date on which no shares of Series C Preferred
Stock are outstanding, whether as a result of conversions, exchanges,
repurchases or redemptions.
 
    See "Corporate Governance and Control" for a description of certain veto
rights exercisable by the Series C Directors.
 
    OPTIONAL REDEMPTION
 
    The Company may redeem the Series C Preferred Stock in whole or in part at
the Put Price at any time on 60 days' prior notice. Notwithstanding the
Company's attempt to redeem the Series C Preferred Stock in whole, until August
1, 2003, each Employee Trust may retain one share of Series C Preferred Stock
for purposes of exercising the right to elect Series C Directors, as described
above.
 
    LIQUIDATION PREFERENCE
 
    The Series C Preferred Stock has a liquidation preference per share equal to
the Put Price. The Series C Preferred Stock ranks junior to the Series A
Preferred Stock and the Series B Preferred Stock and senior to the Series D
Preferred Stock both as to preference in liquidation and bankruptcy and the
receipt of dividends and repayment. The issuance by the Company of a new series
of Preferred Stock that ranks, as to both preference in liquidation and
bankruptcy and the receipt of dividends and repayment, senior to or PARI PASSU
with the Series C Preferred Stock, does not require the consent of the holders
of the Series C Preferred Stock.
 
    ACCOUNTING TREATMENT
 
    Because of applicable accounting requirements, the Company must recognize
compensation expense for each twelve-month period ending December 31 based on
the values at December 31 of the Series C Preferred Stock and the Common Stock
earned by employees during the preceding twelve-month period. Such non-cash
stock-based compensation expense is calculated each month by (1) determining the
aggregate current value of all Series C Preferred Stock and Common Stock earned
by employees since the previous January 1 using current per share values as of
the balance sheet date and then (2) subtracting the non-cash compensation
expense recognized since the prior January 1. Any increase (decrease) in share
values increases (decreases) non-cash compensation expense and the recorded
effect in any month of a change in share prices is a function of all shares
earned since the previous January 1. Such changes in share values may be
unrelated to the period's performance or cash flows.
 
    Because of the Put Right associated with the Series C Preferred Stock, such
stock is classified as a series of redeemable Preferred Stock of the Company
instead of being included in common stockholders' equity. The carrying value of
the Series C Preferred Stock will be accreted over ten years to the ultimate
 
                                       25
<PAGE>
redemption amount for the Series C Preferred Stock (projected to approximate
$381 million for the shares of Series C Preferred Stock that have not been
converted). These accretions during the ten-year period beginning August 1, 1993
will not be charged to net income. Instead, the amount of the accretions during
such period will be accomplished through a transfer of the periodic accretion
amount from retained earnings (I.E., accumulated deficit) to the Series C
Preferred Stock financial statement carrying value and will be deducted from net
income to arrive at net income (loss) applicable to common stockholders.
 
SERIES D PREFERRED STOCK AND RIGHTS
 
    On November 16, 1995, the Board of Directors of the Company declared a
dividend of one Preferred Share Purchase Right (a "Right") for each outstanding
share of Class A Common Stock and Class B Common Stock. The dividend was paid on
November 27, 1995 (the "Record Date") to the stockholders of record on that
date. Each Right entitles the registered holder to purchase from the Company one
one-hundredth of a share of Series D Preferred Stock at a price of $150 per one
one-hundredth of a share of Series D Preferred Stock (the "Purchase Price"),
subject to adjustment. The description and terms of the Rights are set forth in
a Rights Agreement dated as of November 16, 1995, as the same may be amended
from time to time (the "Rights Agreement"), between the Company and Norwest Bank
Minnesota, N.A., as Rights Agent (the "Rights Agent").
 
    Until the earlier to occur of (a) 10 days following a public announcement
that a person or group of affiliated or associated persons (an "Acquiring
Person") have acquired beneficial ownership of a number of shares of Class A
Common Stock equal to 19% or more of the sum of (i) the Common Shares then
issued and outstanding, (ii) all Common Shares issuable pursuant to the Plan to
the Employee Trusts, (iii) all Common Shares issuable upon conversion of all the
shares of Series C Preferred Stock issued or issuable to the Employee Trusts
pursuant to the Plan, (iv) all Common Shares issuable upon the exercise of all
employee stock options issued and outstanding as of the date of this Agreement
and (v) any other Common Shares not then actually issued and outstanding but
which such Person would be deemed to beneficially own hereunder (other than the
shares of Class A Common Stock issuable upon conversion of the shares of Class B
Common Stock held by such Person or the Class B Common Stock issuable upon
conversion of the Class A Common Stock held by such Person) (together, the
"outstanding Common Shares"); PROVIDED, HOWEVER, that if a Person would be
deemed an Acquiring Person upon the adoption of the Rights Agreement, such
Person will not be deemed an "Acquiring Person" for any purposes of the Rights
Agreement unless and until such Person acquires Beneficial Ownership of any
additional shares of Class A Common Stock after the date of the adoption of the
Rights Agreement unless upon the consummation of the acquisition of such
additional shares of Class A Common Stock such Person does not beneficially own
a number of shares of Class A Common Stock equal to 19% or more of the
outstanding Common Shares or (b) 10 business days (or such later date as may be
determined by action of the Board of Directors prior to such time as any person
or group of affiliated persons becomes an Acquiring Person) following the
commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of a number of shares of Class A Common Stock
equal to 19% or more of the number of outstanding Common Shares (the earlier of
such dates being called the "Distribution Date"), the Rights will be evidenced,
with respect to any of the Common Share certificates outstanding as of the
Record Date, by such Common Share certificate.
 
    The Rights Agreement provides that, until the Distribution Date (or earlier
redemption or expiration of the Rights), the Rights will be transferred with and
only with the Common Shares; PROVIDED, HOWEVER, that prior to the Distribution
Date, upon the conversion of shares of Class B Common Stock into shares of Class
A Common Stock all Rights attached to the Class B Common Stock shall be deemed
cancelled and retired by the Company and upon the conversion of shares of Class
A Common Stock into shares of Class B Common Stock all Rights attached to the
Class A Common Stock shall be deemed cancelled and retired by the Company. Until
the Distribution Date (or earlier redemption or expiration of the Rights),
 
                                       26
<PAGE>
new Common Share certificates issued after the Record Date upon transfer or new
issuances of Common Shares (including pursuant to the conversion of Series C
Series D Preferred Stock) will contain a notation incorporating the Rights
Agreement by reference. Until the Distribution Date (or earlier redemption or
expiration of the Rights), the surrender for transfer of any certificates for
Common Shares outstanding as of the Record Date will also constitute the
transfer of the Rights associated with the Common Shares represented by such
certificate. As soon as practicable following the Distribution Date, separate
certificates evidencing the Rights ("Right Certificates") will be mailed to
holders of record of the Common Shares as of the close of business on the
Distribution Date and such separate Right Certificates alone will evidence the
Rights.
 
    The Rights are not exercisable until the Distribution Date. The Rights will
expire on November 16, 2005 (the "Final Expiration Date"), unless the Final
Expiration Date is extended or unless the Rights are earlier redeemed or
exchanged by the Company, in each case as described below.
 
    The Purchase Price payable, and the number of shares of Series D Preferred
Stock or other securities or property issuable, upon exercise of the Rights are
subject to adjustment from time to time to prevent dilution (i) in the event of
a stock dividend on, or a subdivision, combination or reclassification of, the
Series D Preferred Stock, (ii) upon the grant to holders of the Series D
Preferred Stock of certain rights or warrants to subscribe for or purchase
Series D Preferred Stock at a price, or securities convertible into Series D
Preferred Stock with a conversion price, less than the then-current market price
of the Series D Preferred Stock or (iii) upon the distribution to holders of the
Series D Preferred Stock of evidences of indebtedness or assets (excluding
regular periodic cash dividends or dividends payable in Series D Preferred
Stock) or of subscription rights or warrants (other than those referred to
above).
 
    The number of outstanding Rights are also subject to adjustment in the event
of a stock split of the Common Shares or a stock dividend on the Common Shares
payable in Common Shares or subdivisions, consolidations or combinations of the
Common Shares occurring, in any such case, prior to the Distribution Date.
 
    Shares of Series D Preferred Stock purchasable upon exercise of the Rights
will not be redeemable. Each share of Series D Preferred Stock will be entitled,
when, as and if declared, to a minimum preferential quarterly dividend payment
of $1 per share but will be entitled to an aggregate dividend of 100 times the
dividend declared per share of Common Stock. In the event of liquidation, the
holders of the Series D Preferred Stock will be entitled to a minimum
preferential liquidation payment of $100 per share (plus any accrued but unpaid
dividends) but will be entitled to an aggregate payment of 100 times the payment
made per share of Common Stock. Each share of Series D Preferred Stock will have
100 votes, voting together with the Common Stock. Finally, in the event of any
merger, consolidation or other transaction in which shares of Common Stock are
converted or exchanged, each share of Series D Preferred Stock will be entitled
to receive 100 times the amount received per share of Common Stock. These rights
are protected by customary antidilution provisions.
 
    In the event that any person or group of affiliated or associated persons
becomes an Acquiring Person, each holder of a Right, other than Rights
beneficially owned by the Acquiring Person (which will thereupon become void),
will thereafter have the right to receive upon exercise of a Right at the then
current exercise price of the Right, that number of shares of Class A Common
Stock (or one one-hundredths of a share of Series D Preferred Stock) having a
market value of two times the exercise price of the Right.
 
    In the event that, after a person or group has become an Acquiring Person,
the Company is acquired in a merger or other business combination transaction or
50% or more of its consolidated assets or earning power are sold, proper
provision will be made so that each holder of a Right (other than Rights
beneficially owned by an Acquiring Person which will have become void) will
thereafter have the right to receive, upon the exercise thereof at the then
current exercise price of the Right, that number of shares of common stock of
the person with whom the Company has engaged in the foregoing transaction (or
its
 
                                       27
<PAGE>
parent), which number of shares at the time of such transaction will have a
market value of two times the exercise price of the Right.
 
    At any time after any person or group becomes an Acquiring Person and prior
to the acquisition by such person or group of beneficial ownership of a number
of shares of Class A Common Stock equal to 50% or more of the number of
outstanding Common Shares, the Board of Directors of the Company may exchange
the Rights (other than Rights owned by such person or group which will have
become void), in whole or in part, at an exchange ratio of one share of Class A
Common Stock, or one one-hundredth of a share of Series D Preferred Stock (or of
a share of a class or series of the Company's preferred stock having equivalent
rights, preferences and privileges), per Right (subject to adjustment).
 
    With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price. No fractional shares of Series D Preferred Stock will be
issued (other than fractions which are integral multiples of one one-hundredth
of a share of Series D Preferred Stock, which may, at the election of the
Company, be evidenced by depositary receipts) and in lieu thereof, an adjustment
in cash will be made based on the market price of the Series D Preferred Stock
on the last trading day prior to the date of exercise.
 
    At any time prior to the time an Acquiring Person becomes such, the Board of
Directors of the Company may redeem the Rights in whole, but not in part, at a
price of $.01 per Right (the "Redemption Price"). Immediately upon any
redemption of the Rights, the right to exercise the Rights will terminate and
the only right of the holders of Rights will be to receive the Redemption Price.
 
    For so long as the Rights are then redeemable, the Company may, except with
respect to the redemption price, amend the Rights in any manner. After the
Rights are no longer redeemable the Company may, except with respect to the
redemption price, amend the Rights in any manner that does not adversely affect
the interests of holders of the Rights.
 
    Until a Right is exercised, the holder thereof, as such, will have no rights
as a stockholder of the Company, including, without limitation, the right to
vote or to receive dividends.
 
                        CORPORATE GOVERNANCE AND CONTROL
 
    The Company's bylaws provide that the Board of Directors will consist of 15
members, subject to the rights of certain holders of Preferred Stock to elect
additional directors to the Board of Directors under certain circumstances. The
Certificate of Designation for the Series C Preferred Stock provides that the
holders of the Series C Preferred Stock will be entitled to elect three of the
15 directors as long as any shares of Series C Preferred Stock are outstanding.
See "Description of Series A, Series B, Series C and Series D Preferred Stock
and Rights--Series C Preferred Stock--Voting Rights."
 
    Special meetings of stockholders may only be called by either the Chairman
of the Board or at the direction of a majority of the Board of Directors. During
the four-year period commencing August 1, 1993, approval of the following
matters may be disapproved if votes against such approval are cast by directors
who constitute a Blocking Coalition (as defined below): (i) the restructuring of
the Company; (ii) any annual operating and capital budget or financing plan or
any medium term business plan of the Company; (iii) any merger, consolidation or
sale of the Company, or encumbrance of a substantial portion of its assets; (iv)
any sale or relinquishment of a substantial portion of Northwest's DOT route
authority or operating rights or any route or route authority granted pursuant
to the 1952 bilateral agreement with Japan, and any sale or transfer of any
combination of two or more international routes; (v) any sale or relinquishment
of operational control over the Company or any material portion of its assets;
(vi) the payment of Common Stock dividends or any redemption or repurchase of
equity securities of the Company (except as required by the terms of the
Company's Preferred Stock or stock option plan); (vii) any material (over $100
million) acquisitions, joint ventures or airline marketing agreements; (viii)
any sale of Common Stock (or securities convertible into Common Stock) to any
person or group of persons if
 
                                       28
<PAGE>
after such sale such person or group would own more than 25% of the outstanding
Common Stock; (ix) any voluntary bankruptcy filing or liquidation of the
Company; or (x) the appointment or dismissal of the president or chief executive
officer of NWA Corp., NWA Inc. or Northwest.
 
    A "Blocking Coalition" exists if at least five of the Company's directors
vote against a matter considered by the Board of Directors and the negative
votes cast against the matter satisfy the following specific requirements
specified in the succeeding sentence designed to prevent any two of the
following groups of directors from blocking any such matter that is approved by
all other directors: (1) Alfred A. Checchi, Gary L. Wilson and Frederic V.
Malek, or any person who fills a vacancy arising from the resignation, death,
removal or expiration of the term of any of Messrs. Checchi, Wilson or Malek
(the "Checchi-Wilson-Malek Directors"); (2) any person designated by KLM for
election to the Board of Directors pursuant to the Stockholders' Agreement (the
"KLM Directors"); and (3) the three Series C Directors. A Blocking Coalition
must satisfy one of the following three requirements: (a) the three
Checchi-Wilson-Malek Directors vote against the matter and the Blocking
Coalition includes at least two other directors of whom not more than one may be
a KLM Director and not more than one may be a Series C Director; (b) the three
KLM Directors vote against the matter and the Blocking Coalition includes at
least two other directors of whom not more than one may be a
Checchi-Wilson-Malek Director and not more than one may be a Series C Director;
or (c) the Series C Directors vote against the matter and the Blocking Coalition
includes at least two directors of whom not more than one may be a Checchi-
Wilson-Malek Director and not more than one may be a KLM Director.
 
    After August 1, 1997 or earlier in the event that the Series C Preferred
Stock ceases to be outstanding, a vote of a simple majority of the entire Board
of Directors is required in order to approve the foregoing actions.
 
STOCKHOLDERS' AGREEMENTS
 
    The Stockholders' Agreement provides the Original Investors will vote their
shares of Common Stock and will cause their designees on the Board of Directors
to vote in favor of the election of the following designated 11 directors:
 
        (i) three designees of Alfred A. Checchi and the Checchi Family Trusts
    (collectively, the "Checchi Family") and three designees of Gary L. Wilson
    and members of his family (the "Wilson Family"), except that prior to August
    1, 1996, the Checchi Family and the Wilson Family collectively were entitled
    to designate three, rather than six, directors to the Board of Directors and
    of the remaining three seats on the Board of Directors, two were to be
    filled by Messrs. John H. Dasburg and Thomas L. Kempner and one was to be
    filled by a person nominated by the unanimous vote of the Board of
    Directors;
 
        (ii) one designee of Blum or its affiliates;
 
       (iii) one designee of BTNY or its affiliates; and
 
        (iv) three designees of KLM or its affiliates.
 
    Seven of the 11 current members of the Board of Directors are designees
under the Stockholders' Agreement: Messrs. Checchi, Wilson and Malek were
designated jointly by the Checchi Family and the Wilson Family; Mr. Richard C.
Blum was designated by Blum; Mr. George J. Vojta was designated by BTNY; and
Messrs. Kempner and Dasburg were designated pursuant to the terms of the
Stockholders' Agreement. Mr. V.A. Ravindran was nominated pursuant to the
Company's bylaws. Messrs. Tom Ducy, Marvin L. Griswold and Duane E. Woerth were
designated by the IAM, the IBT and the Northwest MEC, respectively. There are
currently four vacancies on the Board of Directors. As noted above, under the
terms of the Stockholders' Agreement, KLM is entitled to designate three
individuals to serve as directors. During 1995, Rob J. N. Abrahamsen, Pieter
Bouw and Leo M. van Wijk served as directors and were designated by KLM under
the Stockholders' Agreement. Messrs. Abrahamsen, Bouw and van Wijk
 
                                       29
<PAGE>
resigned as directors in February 1996. KLM has not subsequently designated any
individuals to serve on the Board of Directors. KLM has advised the Company that
it will nominate three persons not affiliated with KLM to fill the vacancies
created by these resignations. Under the Stockholders' Agreement, any future
vacancies in the Board of Directors seats currently held by Messrs. Kempner and
Dasburg and the existing vacancy in the one Board of Directors seat that cannot
be designated by KLM are to be designated by the Checchi Family and the Wilson
Family.
 
    As a result of these provisions of the Stockholders' Agreement, as long as
the Stockholders' Agreement remains in effect purchasers of shares of Class A
Common Stock offered hereby will have no practical ability to influence the
election of the Company's directors.
 
    For each transfer of 2,635,019 shares of Common Stock by the Checchi Family
and the Wilson Family and their affiliates beyond the transfer of 7,905,057
shares, the number of directors that the Checchi Family and the Wilson Family
may designate on the Board of Directors will be reduced by one. The right of an
Original Investor to designate one or more directors pursuant to the
Stockholders' Agreement terminates if such party holds fewer than 2,635,019
shares of Common Stock (subject to certain exceptions based on holdings of
Series A and Series B Preferred Stock). The Stockholders' Agreement provides
that if there is a reduction in the number of directors that an Original
Investor may designate, all of the Original Investors will cause their
representatives on the Board of Directors to vote in favor of reduction in the
number of seats on the Board of Directors by the same number. In addition, if
the Company defaults in the payment of dividends or redemption payments on
either the Series A Preferred Stock or the Series B Preferred Stock, or both,
and defaults in the payment of dividends or redemption payments on the Series C
Preferred Stock, the Original Investors have agreed to cause the size of the
Board of Directors to be increased so that the holders of a majority of the
shares of such defaulted class of Preferred Stock may designate a new director
in accordance with the terms of the relevant Certificate of Designation.
 
    Pursuant to the Equity Letter Agreements, in September 1994, the Original
Investors entered into an agreement (the "1994 Stockholders' Agreement" and,
together with the Stockholders' Agreement, the "Stockholders' Agreements"), with
the IAM, the IBT, ALPA, the Employee Trusts and separate arrangements that are
signatories thereto and NWA Corp. under which certain rights were extended to
the holders of the stock to be issued to the Employee Trusts. The Stockholders'
Agreements provide among other things that the Original Investors may not
transfer any of their shares of Common Stock prior to June 15, 1997, subject to
certain exceptions. On January 25, 1995, the Company consummated an agreement
with BTNY to exchange 1,727 shares of the Company's Series B Preferred Stock
previously held by BTNY for 2,050,000 shares of newly issued Class B Common
Stock. In connection with the exchange of shares, amendments to the
Stockholders' Agreements were entered into which released BTNY from the
restrictions contained in each agreement on the transfer of shares of Common
Stock held by BTNY (including any shares of Class A Common Stock into which such
shares may be converted). Pursuant to the Stockholders' Agreement and certain
assignments of rights thereunder, Blum may sell up to approximately $11.4
million of Class A Common Stock without regard to the transfer restrictions
otherwise applicable.
 
    The Stockholders' Agreements were amended in 1995 to delete the provisions
relating to "tag-along" rights and rights of first refusal and reoffer and to
permit the Original Investors to vote their shares of Common Stock for the
election of directors in addition to the 11 directors designated pursuant to the
Stockholders' Agreement. The Stockholders' Agreement was also amended to delete
any special voting requirements applicable to the Original Investors in
connection with a merger or other business combination involving the Company.
 
    Pursuant to the Stockholders' Agreement, KLM has the right to purchase up to
5,270,038 shares of Common Stock from certain of the other Original Investors
(the "KLM Option"). Such right is exercisable in 1998. If KLM does not exercise
the KLM Option in full, each Original Investor has the right to cause KLM to
purchase its shares subject to the KLM Option. Such right is exercisable in
1999. In addition, the Company has agreed with KLM that KLM will be afforded an
opportunity to purchase from the Company
 
                                       30
<PAGE>
a pro rata percentage of shares being publicly or privately sold by the Company
over a period of five years beginning in January 1994 in order to prevent
dilution in KLM's voting interest in the Company.
 
    The terms and provisions of the Stockholders' Agreements will terminate on
the earliest of (i) the date on which shares of Common Stock sold pursuant to a
public offering, when aggregated with all other shares of Common Stock
previously sold pursuant to public offerings, equal at least 50% of the Common
Stock then outstanding on a fully diluted basis, (ii) the date on which none of
the Original Investors and their respective affiliates own at least 10% of the
original equity of the Company acquired by them in the Acquisition and (iii)
July 21, 1999. Amendments to the Stockholders' Agreements require the approvals
specified therein.
 
    A shareholders rights plan was approved at a Board of Directors meeting on
November 16, 1995 and the dividend with respect to the distribution of the
Rights occurred on November 27, 1995. See "Description of Series A, Series B,
Series C and Series D Preferred Stock and Rights--Series D Preferred Stock and
Rights." The adoption of the shareholders rights plan by the Company could
possibly affect the exercise by KLM of the KLM Option, exercisable in August
1998, to purchase up to 5,270,038 shares of Common Stock from other Original
Investors. In order to exercise the KLM Option in August 1998 should KLM's then
outstanding holdings of Common Stock plus any shares it may elect to purchase
under the KLM Option exceed the ownership threshold then in effect under the
shareholder rights plan, KLM first might have to divest itself of Common Stock
then held so as not to exceed the ownership threshold provided for in the rights
plan. KLM opposed the adoption of the shareholder rights plan and has advised
the Company that it would oppose any other action by the Company or the other
Original Investors taken without KLM's consent if such action limited or
otherwise adversely affected KLM's rights under the KLM board representation
agreement (described below under "--KLM Agreement") or the Stockholders'
Agreement.
 
    KLM has instituted litigation against the other Original Investors seeking a
declaratory judgment that the amendments to the Stockholders' Agreements
described above are null and void. KLM has also instituted litigation against
the Company and its directors (other than the KLM Directors) seeking to rescind
the adoption of the shareholders rights plan or, alternately, to require that
the KLM Option be exempted from the operation of the shareholders rights plan.
The Company believes that KLM's litigation against both the Original Investors
and the Company and its directors is without merit.
 
KLM AGREEMENT
 
    The Company has entered into an agreement with KLM providing that for the
15-year period following termination of the Stockholders' Agreement, KLM will be
entitled to designate a number of directors on the Company's Board of Directors
proportional to KLM's then percentage common equity interest in the Company (but
not in excess of one-third of the Board of Directors seats or such lesser amount
which is the maximum permitted under U.S. law). This agreement is terminable by
either party if KLM should terminate the Commercial Cooperation and Integration
Agreement entered into by the Company and KLM in September 1992, pursuant to
which the Company and KLM have entered into code-sharing, blocked-space
arrangements and joint commercial operations.
 
                          FOREIGN OWNERSHIP OF SHARES
 
    The Federal Aviation Act prohibits non-U.S. citizens from owning more than
25% of the voting interest of a company such as NWA Corp., which owns a U.S. air
carrier. NWA Corp.'s Restated Certificate of Incorporation provides that no
shares of NWA Corp.'s voting stock may be voted by or at the direction of
persons who are not U.S. citizens unless such shares are registered on a
separate stock register maintained by the Company for non-U.S. holders (the
"Foreign Stock Registry"). The Company's bylaws provide that no shares of the
Company's voting stock held by non-U.S. citizens will be registered on the
 
                                       31
<PAGE>
Foreign Stock Registry if the amount so registered would exceed foreign
ownership restrictions--currently 25% of the Company's voting stock.
 
    As of July 31, 1996, approximately 19.7% of Company's outstanding voting
stock was registered on the Foreign Share Registry. As of July 31, 1996, KLM
owned or controlled and had registered on the Foreign Stock Registry 21,684,099
shares of Class A Common Stock, 1,308.8 shares of Series A Preferred Stock and
436.2 shares of Series B Preferred Stock, which constitute 19.7% of the total
outstanding voting stock of the Company. KLM has a priority right to register
new Class A Common Stock it may acquire pursuant to an anti-dilution provision
in favor of KLM contained in the Stockholders' Agreement. Any holder of Class A
Common Stock who is not a U.S. citizen and has not registered its shares on the
Foreign Stock Registry will not be permitted to vote its shares. Because the
Foreign Share Registry has only limited remaining capacity, non-U.S. purchasers
of the securities may not be able to vote the shares of Class A Common Stock
purchased by them.
 
    Under Section 40102(a)(15) of the Federal Aviation Act, the term "citizen of
the United States" is defined as: (i) an individual who is a citizen of the
U.S., (ii) a partnership each of whose partners is an individual who is a
citizen of the U.S., and (iii) a corporation or association organized under the
laws of the U.S. or a state, the District of Columbia or a territory or
possession of the U.S. of which the president and at least two-thirds of the
board of directors and other managing officers are citizens of the U.S., and in
which at least 75% of the voting interest is owned or controlled by persons that
are citizens of the U.S.
 
            POTENTIAL SALES OF COMMON STOCK BY CERTAIN STOCKHOLDERS
 
GENERAL
 
    As of July 31, 1996, the Original Investors held 53,431,933 shares of Class
A Common Stock (assuming conversion into Class A Common Stock of shares of Class
B Common Stock held by BTNY), employees held options to acquire an additional
3,217,358 shares of Class A Common Stock, and the Employee Trusts held for the
benefit of participants 20,349,203 shares of Class A Common Stock (expressed on
a basis fully converted to Class A Common Stock). By March 31, 1997, NWA Corp.
will have contributed to the Plan an additional 5,930,217 shares of Class A
Common Stock (expressed on a basis fully converted to Class A Common Stock).
 
    Since April 1, 1996, participants in the Plan have had the right, from time
to time, to direct that all or a portion of the "liquid shares" then allocated
to their accounts under the Plan be sold. See "--Liquidity for Employee Shares."
NWA Corp. has agreed with the trustees under the Plan to take such actions as
shall be reasonably necessary in order that Class A Common Stock able to be sold
under the Plan may generally be freely resold without further registration under
the Securities Act. Shares issuable upon exercise of employee stock options have
already been registered under the Securities Act and generally may be freely
resold. A "lock-up" imposed by the Stockholders' Agreement on the Original
Investors (other than BTNY) will expire on June 15, 1997, at which point the
Original Investors will be able to sell their shares (other than certain shares
subject to a purchase option held by KLM) under Rule 144 or pursuant to an
effective registration statement. Under the registration rights agreement
described below, the Original Investors have certain "piggyback" and "demand"
registration rights. To a limited extent, the trustees under the Plan have
certain "piggyback" registration rights.
 
    As a result of all of the foregoing, there is a substantial number of shares
of Class A Common Stock which could be subject to future sale. No predictions
can be made as to the effect, if any, that market sales of shares of Class A
Common Stock or the availability of such shares for sale will have on the market
price prevailing from time to time. Public or private sales of substantial
amounts of Class A Common Stock (including shares issued upon the exercise of
stock options and/or conversion of the Series C Preferred Stock and Class B
Common Stock), or the perception that such sales could take place, may adversely
affect prevailing market prices for the Class A Common Stock.
 
                                       32
<PAGE>
LIQUIDITY FOR EMPLOYEE SHARES
 
    NWA Corp. has already contributed to the Plan shares of its capital stock
representing 23,993,401 shares of Class A Common Stock on a fully converted
basis, and prior to March 31, 1997 it is obligated to make additional
contributions representing another 5,930,215 shares of Class A Common Stock on a
fully converted basis. Such contributed shares are periodically allocated to
individual participants' accounts in accordance with criteria specified in the
Plan.
 
    Since April 1, 1996, participants have had the right, from time to time, to
direct the relevant trustee under the Plan to sell all or any portion of the
remaining "liquid shares" allocated to such participant (expressed on a basis
fully converted to Class A Common Stock). The aggregate cumulative number of
liquid shares that may be designated for sale by participants (which will be
reduced by prior sales or withdrawals from the Plan) increases over time, as
reflected in the following table:
 
<TABLE>
<CAPTION>
                                   AGGREGATE CUMULATIVE                                     AGGREGATE CUMULATIVE
                                     NUMBER OF LIQUID                                         NUMBER OF LIQUID
              DATE                        SHARES                       DATE                        SHARES
- ---------------------------------  --------------------  ---------------------------------  --------------------
<S>                                <C>                   <C>                                <C>
12/31/95 to 03/30/96.............          6,031,520     06/30/97 to 09/29/97.............         19,897,189
03/31/96 to 06/29/96.............          8,374,510     09/30/97 to 12/30/97.............         22,107,988
06/30/96 to 09/29/96.............         10,468,138     12/31/97 to 03/30/98.............         24,318,787
09/30/96 to 12/30/96.............         12,561,765     03/31/98 to 06/29/98.............         26,529,585
12/31/96 to 03/30/97.............         15,120,870     06/30/98 to 09/29/98.............         28,740,384
03/31/97 to 06/29/97.............         17,686,390     09/30/98 and thereafter..........         29,923,616
</TABLE>
 
    The number of liquid shares that an individual participant can direct for
sale as of a given date is the "liquid percentage" of such participant's
allocated shares as of such period, minus the number of shares previously sold
or otherwise withdrawn from the Plan by such participant. The "liquid
percentage" means the percentage based on a fraction, the numerator of which is
the aggregate cumulative number of liquid shares as of the date of determination
and the denominator of which is the number of previously allocated shares as of
such date for all participants, without regard to prior sales or withdrawals.
 
REGISTRATION RIGHTS AGREEMENT
 
    The Registration Rights Agreement provides the Original Investors and, under
certain circumstances, the holders of shares contributed to the Plan, with
"piggy-back" registration rights, under which any of them has the right to have
their shares of Class A Common Stock registered under the Securities Act under
any registration statement (other than a registration statement on Form S-4 or
S-8) that the Company may file with the Commission with respect to such Class A
Common Stock. However, in certain events the exercise of such piggy-back rights
may be subject to the approval of the managing underwriter of the offering being
registered by the Company. If the managing underwriter believes that inclusion
of the requesting stockholders' shares would have an adverse effect on the
Company's offering, the managing underwriter may refuse to allow exercise of the
piggy-back registration rights.
 
    The Registration Rights Agreement further provides the Original Investors
and certain of their transferees with demand registration rights under which the
holders of not less than 20% of the Class A Common Stock subject to such
agreement have the right to demand that the Company file a registration
statement with the Commission in order to register such shares under the
Securities Act. However, in the following circumstances these demand
registration rights may not be exercised unless holders of two-thirds of the
Common Stock subject to the Registration Rights Agreement consent thereto: (i) a
request for registration is made within one year after the effective date of any
other registration statement relating to exercise of demand registration rights
or exercise of piggy-back registration rights; (ii) four registration statements
relating to exercise of demand registration rights have been filed and declared
effective by the Commission; or (iii) the managing underwriter, the Commission,
the Securities Act or the form on which the registration statement is to be
filed would require the conduct of an audit other than the regular audit
 
                                       33
<PAGE>
conducted by the Company at the end of its fiscal year (unless the holders of
such Common Stock to be registered agree to pay the expenses of the Company in
connection with such a special audit).
 
    All expenses associated with the registration of Class A Common Stock
pursuant to the exercise of piggy-back registration rights and all costs
associated with the first two registration statements filed pursuant to the
exercise of demand registration rights will be borne by the Company, with the
exception of underwriting discounts and commissions and any transfer taxes
relating to the transfer of such registered shares. In accordance with the terms
of the Registration Rights Agreement, the Company is required to indemnify any
holder of Common Stock whose shares are registered pursuant to the exercise of
piggy-back registration rights or demand registration rights for any liability
or loss resulting from any material misstatements or omissions in the
registration statement under which such shares are registered.
 
    Under a separate registration rights agreement and the Stockholders'
Agreement, the holders of Series A Preferred Stock and Series B Preferred Stock
have been granted demand registration rights substantially similar to those
granted under the Registration Rights Agreement.
 
                              PLAN OF DISTRIBUTION
 
    NWA Corp. may sell Securities to one or more underwriters for public
offering and sale by them or may sell Securities to investors or other persons
directly or through one or more dealers or agents. Any such underwriter, dealer
or agent involved in the offer and sale of the Offered Securities will be named
in an applicable Prospectus Supplement.
 
    The Offered Securities may be sold at a fixed price or prices, which may be
changed, or at prices related to prevailing market prices or at negotiated
prices. Dealer trading may take place in certain of the Offered Securities,
including Offered Securities not listed on any securities exchange. NWA Corp.
also may, from time to time, authorize underwriters acting as NWA Corp.'s agents
to offer and sell the Offered Securities upon the terms and conditions as shall
be set forth in any Prospectus Supplement. In connection with the sale of
Offered Securities, underwriters may be deemed to have received compensation
from NWA Corp. in the form of underwriting discounts or commissions and also may
receive commissions from purchasers of Offered Securities for whom they may act
as agent. Underwriters may sell Offered Securities to or through dealers, and
such dealers may receive compensation in the form of discounts, concessions or
commissions from the underwriters and/or commissions (which may be changed from
time to time) from the purchasers for whom they may act as agent.
 
    If a dealer is used directly by NWA Corp. in the sale of Offered Securities
in respect of which this Prospectus is delivered, NWA Corp. will sell such
Offered Securities to the dealer, as principal. The dealer may then resell such
Offered Securities to the public at varying prices to be determined by such
dealer at the time of resale. Any such dealer and the terms of any such sale
will be set forth in the Prospectus Supplement relating thereto.
 
    Offered Securities may be offered and sold through agents designated by NWA
Corp. from time to time. Any such agent involved in the offer or sale of the
Offered Securities in respect of which this Prospectus is delivered will be
named in, and any commissions payable by NWA Corp. to such agent will be set
forth in, the applicable Prospectus Supplement. Unless otherwise indicated in
the applicable Prospectus Supplement, any such agent will be acting on a best
efforts basis for the period of its appointment.
 
    Offers to purchase Offered Securities may be solicited directly by NWA Corp.
and sales thereof may be made by NWA Corp. directly to institutional investors
or others who may be deemed to be underwriters within the meaning of the
Securities Act with respect to any resale thereof. The terms of any such sales
will be described in the Prospectus Supplement relating thereto. Except as set
forth in the applicable Prospectus Supplement, no director, officer or employee
of NWA Corp. will solicit or receive a commission in connection with direct
sales by NWA Corp. of the Offered Securities, although such persons may respond
to inquiries by potential purchasers and perform ministerial and clerical work
in connection with any such direct sales.
 
                                       34
<PAGE>
    Any underwriting compensation paid by NWA Corp. to underwriters, dealers or
agents in connection with the offering of Offered Securities, and any discounts,
concessions or commissions allowed by underwriters to participating dealers,
will be set forth in an applicable Prospectus Supplement. Underwriters, dealers
and agents participating in the distribution of the Offered Securities may be
deemed to be underwriters, and any discounts and commissions received by them
and any profit realized by them on resale of the Offered Securities may be
deemed to be underwriting discounts and commissions under the Securities Act.
Underwriters, dealers and agents may be entitled, under agreements with NWA
Corp., to indemnification against and contribution toward certain civil
liabilities, including liabilities under the Securities Act, and to
reimbursement by NWA Corp. for certain expenses.
 
    Underwriters, dealers and agents may engage in transactions with, or perform
services for, NWA Corp. and its subsidiaries in the ordinary course of business.
 
    If so indicated in an applicable Prospectus Supplement and subject to
existing market conditions, NWA Corp. will authorize dealers acting as NWA
Corp.'s agents to solicit offers by certain institutions to purchase Convertible
Debt Securities from NWA Corp. at the public offering price set forth in such
Prospectus Supplement pursuant to Delayed Delivery Contracts ("Contracts")
providing for payment and delivery on the date or dates stated in such
Prospectus Supplement. Institutions with whom Contracts, when authorized, may be
made include commercial and savings banks, insurance companies, pension funds,
investment companies, educational and charitable institutions and other
institutions, but will in all cases be subject to the approval of NWA Corp.
Contracts will not be subject to any conditions except the purchase by an
institution of Convertible Debt Securities covered by its Contracts shall not at
the time of delivery be prohibited under the laws of any jurisdiction in the
United States to which such institution is subject. A commission indicated in
the applicable Prospectus Supplement will be granted to underwriters and agents
soliciting purchases of Offered Securities pursuant to Contracts accepted by NWA
Corp. Agents and underwriters will have no responsibility in respect of the
delivery or performance of Contracts.
 
    The Offered Securities may or may not be listed on a national securities
exchange or a foreign securities exchange (other than the Class A Common Stock,
which is approved for quotation on the Nasdaq National Market). If an
underwriter or underwriters are utilized in the sale of any Offered Securities,
the applicable Prospectus Supplement will contain a statement as to the
intention, if any, of such underwriters at the date of such Prospectus
Supplement to make a market in the Offered Securities. No assurances can be
given that there will be a market for the Offered Securities.
 
    The place and time of delivery for the Offered Securities in respect of
which this Prospectus is delivered will be set forth in the applicable
Prospectus Supplement. Class A Common Stock issuable upon exercise of Warrants
will be issued upon payment of the exercise price and otherwise in accordance
with the relevant terms applicable to such Warrants and described in the
relevant Prospectus Supplement.
 
                                 LEGAL OPINIONS
 
    Unless otherwise indicated in the applicable Prospectus Supplement, the
validity of the Convertible Debt Securities, Preferred Stock, Warrants and Class
A Common Stock offered hereby will be passed upon for NWA Corp. by Simpson
Thacher & Bartlett (a partnership which includes professional corporations), New
York, New York.
 
                                    EXPERTS
 
    The consolidated financial statements and schedule of Northwest Airlines
Corporation, appearing or incorporated by reference in Northwest Airlines
Corporation's Annual Report (Form 10-K) for the year ended December 31, 1995,
have been audited by Ernst & Young LLP, independent auditors, as set forth in
their report thereon included or incorporated by reference therein and
incorporated herein by reference. Such consolidated financial statements and
schedule are incorporated herein by reference in reliance upon such report given
upon the authority of such firm as experts in accounting and auditing.
 
                                       35
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS OR ANY RELATED PROSPECTUS
SUPPLEMENT AND/OR PRICING SUPPLEMENT IN CONNECTION WITH THE OFFER CONTAINED IN
THIS PROSPECTUS AND SUCH PROSPECTUS SUPPLEMENT AND/OR PRICING SUPPLEMENT AND, IF
GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY NWA CORP. OR ANY UNDERWRITERS, AGENTS OR DEALERS. THIS
PROSPECTUS AND ANY RELATED PROSPECTUS SUPPLEMENT AND/OR PRICING SUPPLEMENT DO
NOT CONSTITUTE AN OFFER TO SELL OR SOLICITATION OF AN OFFER TO BUY SECURITIES IN
ANY JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR
SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS AND ANY RELATED PROSPECTUS
SUPPLEMENT AND/OR PRICING SUPPLEMENT NOR ANY SALE MADE HEREUNDER OR THEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS BEEN NO
CHANGE IN THE AFFAIRS OF NWA CORP. SINCE THE DATE HEREOF OR THEREOF OR THAT THE
INFORMATION CONTAINED HEREIN OR THEREIN IS CORRECT AT ANY TIME SUBSEQUENT TO THE
DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Available Information.....................................................    2
Incorporation of Certain Documents by Reference...........................    2
The Company...............................................................    3
Dividend Policy...........................................................    3
Use of Proceeds...........................................................    3
Ratio of Earnings to Fixed Charges and Ratio of Earnings to Fixed Charges
  and Preferred Stock Requirements........................................    4
Description of Convertible Debt
  Securities..............................................................    4
Description of Warrants...................................................   14
Description of Capital Stock..............................................   15
Description of Preferred Stock............................................   16
Description of Common Stock...............................................   19
Description of Series A, Series B, Series C and Series D Preferred Stock
  and Rights..............................................................   21
Corporate Governance and Control..........................................   28
Foreign Ownership of Shares...............................................   31
Potential Sales of Common Stock by Certain Stockholders...................   32
Plan of Distribution......................................................   34
Legal Opinions............................................................   35
Experts...................................................................   35
</TABLE>
 
                                  $500,000,000
 
                                   NORTHWEST
                                    AIRLINES
                                  CORPORATION
 
                          CONVERTIBLE DEBT SECURITIES
                                PREFERRED STOCK
                              CLASS A COMMON STOCK
                              WARRANTS TO PURCHASE
                              CLASS A COMMON STOCK
 
                                          , 1996
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                  SUBJECT TO COMPLETION, DATED OCTOBER 2, 1996
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
PROSPECTUS
 
                                  $500,000,000
 
                            NORTHWEST AIRLINES, INC.
 
            DEBT SECURITIES AND WARRANTS TO PURCHASE DEBT SECURITIES
                             ---------------------
 PAYMENT OF PRINCIPAL, PREMIUM, IF ANY, AND INTEREST FULLY AND UNCONDITIONALLY
                                 GUARANTEED BY
 
                         NORTHWEST AIRLINES CORPORATION
 
    Northwest Airlines, Inc. ("Northwest") may from time to time offer, together
or separately, its debt securities, consisting of debentures, notes and/or other
evidences of indebtedness representing unsecured obligations of Northwest (the
"Debt Securities"), and warrants (the "Warrants") to purchase Debt Securities
(collectively, the "Securities"), in amounts, at prices and on terms to be
determined at the time of offering. The Debt Securities offered pursuant to this
Prospectus may be issued as unsecured and unsubordinated Debt Securities
("Senior Debt Securities") or as unsecured and subordinated Debt Securities
("Senior Subordinated Debt Securities"), in one or more series and, together
with any Warrants, will be limited to $500,000,000 aggregate public offering
price and exercise price (or its equivalent (based on the applicable exchange
rate at the time of sale) in one or more foreign currencies or currency units).
 
    The specific terms of the particular Securities in respect of which this
Prospectus is being delivered (the "Offered Securities") will be set forth in a
supplement to this Prospectus (the "Prospectus Supplement") which will be
delivered together with this Prospectus, including, where applicable, in the
case of Debt Securities, the specific designation (including whether the Offered
Securities are Senior Debt Securities or Senior Subordinated Debt Securities),
aggregate principal amount, the denomination, maturity, premium, if any, the
rate (which may be fixed or variable), time and method of calculating payments
of interest, if any, the place or places where principal of, premium, if any,
and interest, if any, on such Debt Securities will be payable, the currency in
which principal of, premium, if any, and interest, if any, on such Debt
Securities will be payable, any terms of redemption at the option of Northwest
or the holder, any sinking fund provisions, the initial public offering price
and other special terms and, in the case of Warrants, the specific designation,
aggregate number, duration, initial public offering price, exercise price,
currency in which the exercise price is payable, detachability of any Warrants,
description of the Debt Securities for which such Warrants are exercisable,
terms of any mandatory or optional call and other special terms, together with
any other terms in connection with the offering and sale of the Offered
Securities, and the net proceeds to Northwest from such offering. This
Prospectus, together with the Prospectus Supplement relating to any Warrants
that have been issued, may also be delivered in connection with the issuance of
the Debt Securities for which such Warrants are exercised.
 
    The Securities may be denominated in United States dollars or, at the option
of Northwest if so specified in the applicable Prospectus Supplement, in one or
more foreign currencies or currency units. The Debt Securities may be issued in
registered form or bearer form, or both. If so specified in the applicable
Prospectus Supplement, Debt Securities of a series may be issued in whole or in
part in the form of one or more temporary or permanent global securities.
 
    The Senior Debt Securities will rank on a parity with all unsecured and
unsubordinated indebtedness of Northwest, and the Senior Subordinated Debt
Securities will be subordinated in right of payment to all Senior Indebtedness
(as hereinafter defined). See "Description of Securities--Subordination of
Senior Subordinated Debt Securities." The Senior Debt Securities and the Senior
Subordinated Debt Securities will be fully and unconditionally guaranteed (the
"Parent Guaranty") by Northwest Airlines Corporation ("NWA Corp." and, together
with its subsidiaries, the "Company"), the indirect parent of Northwest, on a
senior basis and a senior subordinated basis, respectively.
 
    As of June 30, 1996, Northwest had $2,128.9 million of long-term debt and
capital lease obligations which would rank PARI PASSU in right of payment with
the Senior Debt Securities, of which $1,789.1 million was secured by Northwest's
assets and no long-term debt or capital lease obligations which would rank
senior in right of payment to the Senior Debt Securities. As of the same date,
Northwest had no long-term debt or capital lease obligations which would rank
PARI PASSU in right of payment with the Senior Subordinated Debt Securities and
$2,128.9 million of long-term debt and capital lease obligations which would
rank senior in right of payment to the Senior Subordinated Debt Securities, of
which $1,789.1 million was secured by Northwest's assets. As of the same date,
NWA Corp. had $609.9 million of long-term debt obligations (consisting entirely
of NWA Corp.'s guarantees of the indebtedness of subsidiaries) which would rank
PARI PASSU in right of payment with the Parent Guaranty of the Senior Debt
Securities, none of which was secured by NWA Corp.'s assets, and which would
rank prior in right of payment to the Parent Guaranty of the Senior Subordinated
Debt Securities. As of such date, NWA Corp. had no obligations which would rank
senior in right of payment to the Parent Guaranty of the Senior Debt Securities
and no obligations which would rank PARI PASSU in right of payment with the
Parent Guaranty of the Senior Subordinated Debt Securities.
                         ------------------------------
 
    Northwest may sell the Securities to or through underwriters, through
dealers or agents or directly to purchasers. See "Plan of Distribution." The
Prospectus Supplement will set forth the names of any underwriters, dealers or
agents involved in the sale of the Offered Securities in respect of which this
Prospectus is being delivered, the proposed amounts, if any, to be purchased by
underwriters and the compensation, if any, of such underwriters or agents.
 
    THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE SALES OF DEBT SECURITIES OR
WARRANTS UNLESS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.
                         ------------------------------
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
     EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
            REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
               The date of this Prospectus is             , 1996.
<PAGE>
                             AVAILABLE INFORMATION
 
    NWA Corp. and Northwest together have filed with the Securities and Exchange
Commission (the "Commission") a Registration Statement on Form S-3 (together
with all amendments and exhibits, the "Registration Statement") under the
Securities Act of 1933, as amended (the "Securities Act"), with respect to the
Securities offered hereby. This Prospectus does not contain all of the
information set forth in the Registration Statement, certain parts of which are
omitted in accordance with the rules and regulations of the Commission, and to
which reference is hereby made. Statements made in this Prospectus as to the
contents of any contract, agreement or other document referred to are not
necessarily complete. With respect to each such contract, agreement or other
document filed as an exhibit to the Registration Statement, reference is made to
the exhibit for a more complete description of the matter involved.
 
    NWA Corp. is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files periodic reports and other information with the Commission. Such
reports and other information, as well as the Registration Statement, including
exhibits and schedules filed therewith, may be inspected at the public reference
facilities maintained by the Commission at 450 Fifth Street, N.W., Washington,
D.C. 20549, Room 1024, and at the regional offices of the Commission located at
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661
and at 7 World Trade Center, 13th Floor, New York, New York 10048. Copies of
such materials may be obtained from the Public Reference Section of the
Commission, 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed rates.
The Commission maintains a Web site (http://www.sec.gov) that contains reports,
proxy and information statements and other information regarding registrants
that file electronically with the Commission. Northwest is not required to file
separate reports, proxy statements or other information with the Commission
pursuant to the requirements of the Exchange Act. Instead, information with
respect to Northwest is provided, to the extent required, in filings made by NWA
Corp.
 
    Separate financial statements of Northwest are not being provided because
all of the securities being issued by Northwest under this prospectus are fully
and unconditionally guaranteed by NWA Corp. and such financial statements are
therefore not deemed material.
 
    UNLESS OTHERWISE STATED HEREIN, INFORMATION CONTAINED HEREIN CONCERNING THE
AGGREGATE NUMBER OF SHARES AND RESPECTIVE PERCENTAGES OF NWA CORP. STOCK HELD BY
INVESTORS IS BASED ON THE FOLLOWING ASSUMPTIONS: (I) THE ISSUANCE OF ALL CLASS A
COMMON STOCK, PAR VALUE $.01 PER SHARE, OF NWA CORP. (THE "CLASS A COMMON
STOCK"), AND CLASS B COMMON STOCK, PAR VALUE $.01 PER SHARE, OF NWA CORP. (THE
"CLASS B COMMON STOCK" AND, TOGETHER WITH THE CLASS A COMMON STOCK, THE "COMMON
STOCK") AND SERIES C PREFERRED STOCK TO BE ISSUED TO THE EMPLOYEE TRUSTS (AS
DEFINED HEREIN) PURSUANT TO THE EQUITY LETTER AGREEMENTS (AS DEFINED HEREIN) AND
THE CONVERSION OF THE SERIES C PREFERRED STOCK INTO COMMON STOCK AND (II) THE
EXERCISE OF ALL STOCK OPTIONS HELD BY EXECUTIVE OFFICERS THAT ARE EXERCISABLE
WITHIN 60 DAYS OF JULY 31, 1996.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents of NWA Corp., which have been filed with the
Commission, are hereby incorporated by reference in this Prospectus:
 
    (a) NWA Corp.'s Annual Report on Form 10-K for the fiscal year ended
       December 31, 1995; and
 
    (b) NWA Corp.'s Quarterly Reports on Form 10-Q for the quarters ended March
       31, 1996 and June 30, 1996.
 
    All documents filed by NWA Corp. pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering of the Securities offered hereby shall be deemed
to be incorporated by reference into this Prospectus and to be a part hereof
from the respective dates of filing of such documents. Any statement contained
in a document incorporated or deemed to be incorporated by reference herein
shall be deemed to be modified or superseded for purposes of this Prospectus to
the extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus. The Exchange Act file number is 0-23642.
 
    NWA Corp. will provide without charge to any person to whom a copy of this
Prospectus has been delivered, upon written or oral request, a copy of any or
all of the foregoing documents incorporated herein by reference (other than
exhibits to such documents). Requests should be directed to the Secretary's
Office, NWA Corp., 5101 Northwest Drive, Dept. A1180, St. Paul, Minnesota
55111-3034, telephone number (612) 726-2111.
 
                                       2
<PAGE>
                                  THE COMPANY
 
    NWA Corp. was incorporated in February 1989 under the laws of the State of
Delaware. Northwest, the principal wholly-owned indirect subsidiary of NWA
Corp., operates the world's fourth largest airline (as measured by 1995 revenue
passenger miles ("RPMs")) and is engaged principally in commercial
transportation of passengers and cargo. Northwest's business focuses on the
development of a global airline network through the optimization of Northwest's
strategic assets, which include domestic hubs at Detroit and Minneapolis/St.
Paul, an extensive Pacific route system with a hub at Tokyo, and a transatlantic
alliance with KLM Royal Dutch Airlines ("KLM").
 
    Northwest operates substantial domestic and international route networks and
as of June 30, 1996 directly serves more than 150 cities in 18 countries on the
continents of North America, Asia and Europe. Northwest had more than 49 million
enplanements and flew over 62 billion RPMs in 1995.
 
    NWA Inc., the parent company of Northwest, was acquired in 1989 (the
"Acquisition") by NWA Corp., a Delaware corporation formed by Alfred A. Checchi,
Gary L. Wilson, Frederic V. Malek, Fosters Brewing Group Ltd. of Australia
("Fosters"), Bankers Trust New York Corporation ("BTNY"), KLM and Richard C.
Blum & Associates--NWA Partners, L.P. ("Blum") (together (other than Fosters,
which has sold its interest in NWA Corp. to KLM), the "Original Investors") for
the purpose of the Acquisition. As of July 31, 1996, the Original Investors
beneficially owned approximately 46.9% of the common equity representing
approximately 46.2% of the voting equity of NWA Corp. In addition, pursuant to
certain agreements (the "Equity Letter Agreements") entered into by the Company
with several unions representing the Company's employees, NWA Corp. will have
issued to trusts (the "Employee Trusts") for the benefit of Company employees
shares of Series C Preferred Stock and Common Stock which represent
approximately 22.7% of the voting equity of the Company as of July 31, 1996. The
holders of Series C Preferred Stock have the right to elect three of the
Company's directors (the "Series C Directors"). The Original Investors are
parties to an Investor Stockholders' Agreement (the "Stockholders' Agreement")
which governs their votes for the election of 11 of the Company's directors. The
Stockholders' Agreement expires in July 1999, subject to earlier termination in
certain circumstances. See "Corporate Governance and Control."
 
                            ------------------------
 
    NWA Corp. was originally formed under the name Wings Holdings Inc. The
Company's principal executive offices are located at 2700 Lone Oak Parkway,
Eagan, Minnesota 55121; its mailing address is 5101 Northwest Drive, St. Paul,
Minnesota 55111-3034 and its telephone number is (612) 726-2111.
 
                                USE OF PROCEEDS
 
    Unless otherwise indicated in the applicable Prospectus Supplement, the net
proceeds to Northwest from the sale of the Securities offered hereby will be
added to the working capital of Northwest and will be available for general
corporate purposes, among which may be the repayment of outstanding indebtedness
and financing of capital expenditures. The Company does not currently expect to
discharge any such indebtedness or finance any such capital expenditures with
the proceeds of the sale of Securities offered hereby.
 
                                       3
<PAGE>
                       RATIO OF EARNINGS TO FIXED CHARGES
 
    The following table sets forth the ratio of earnings to fixed charges for
NWA Corp. and its consolidated subsidiaries for the periods indicated. The ratio
of earnings to fixed charges represents the number of times that fixed charges
were covered by earnings. In computing the ratio, earnings represent
consolidated earnings (loss) before income taxes, cumulative effect of
accounting change and fixed charges (excluding capitalized interest). Fixed
charges consist of interest expense (including capitalized interest), one-third
of rental expense, which is considered representative of the interest factor,
and amortization of debt discount and expense.
 
<TABLE>
<CAPTION>
               YEAR ENDED DECEMBER 31
- -----------------------------------------------------
  1995       1994       1993       1992       1991
- ---------  ---------  ---------  ---------  ---------
<S>        <C>        <C>        <C>        <C>
     1.91       1.88     (a)        (a)        (a)
</TABLE>
 
- ------------------------
 
(a) Earnings did not cover fixed charges by $121.5 million for the year ended
    December 31, 1993, $1,513.5 million for the year ended December 31, 1992 and
    $522.1 million for the year ended December 31, 1991. Excluding non-recurring
    special charges of $94.3 million for the year ended December 31, 1993, and
    $792.7 million for the year ended December 31, 1992, earnings did not cover
    fixed charges by $27.2 million and $720.8 million for the two periods,
    respectively.
 
                         DESCRIPTION OF DEBT SECURITIES
 
    The Senior Debt Securities are to be issued under an Indenture, dated as of
July 1, 1995, among Northwest, as issuer, NWA Corp., as guarantor, and State
Street Bank & Trust Company, successor to The First National Bank of Boston, as
Trustee (the "Senior Indenture"). The Senior Subordinated Debt Securities are to
be issued under an Indenture, dated as of July 1, 1995, among Northwest, as
issuer, NWA Corp., as guarantor, and State Street Bank & Trust Company,
successor to The First National Bank of Boston, as Trustee (the "Subordinated
Indenture"). The Senior Indenture and the Subordinated Indenture are referred to
herein individually as an "Indenture" and collectively as the "Indentures." A
copy of the form of each Indenture is filed as an exhibit to the Registration
Statement of which this Prospectus is a part.
 
    A series of Debt Securities may be offered contemporaneously with an
offering of Warrants to purchase an additional portion of such or another series
of Debt Securities. Warrants to purchase a series of Debt Securities may also be
offered independently of any offering of Debt Securities. See "Description of
Warrants." The statements herein relating to the Debt Securities and the
Indentures are summaries and reference is made to the detailed provisions of the
Indentures, including the definitions therein of certain terms capitalized in
this Prospectus. Where no distinction is made between the Senior Debt Securities
and the Senior Subordinated Debt Securities or between the Senior Indenture and
the Subordinated Indenture, such summaries refer to any Debt Securities and
either Indenture. Whenever particular defined terms of the Indentures are
referred to herein or in a Prospectus Supplement, such defined terms are
incorporated herein or therein by reference.
 
    The anticipated market for the Debt Securities and the specific use of
proceeds of an offering of such securities will be set forth in the applicable
Prospectus Supplement.
 
GENERAL
 
    The Indentures do not limit the aggregate principal amount of Debt
Securities which may be issued thereunder and provide that Debt Securities may
be issued from time to time in one or more series. The Senior Debt Securities
will be unsecured and unsubordinated obligations of Northwest and will rank on a
parity with all other unsecured and unsubordinated indebtedness of Northwest.
The Senior Subordinated Debt Securities will be unsecured obligations of
Northwest and, as set forth below under "Subordination of
 
                                       4
<PAGE>
Senior Subordinated Debt Securities," will be subordinated in right of payment
to all Senior Indebtedness of Northwest.
 
    Reference is made to the Prospectus Supplement which accompanies this
Prospectus for a description of the specific series of Debt Securities being
offered thereby or, if Warrants are being offered thereby, the Debt Securities
to be issued upon exercise of such Warrants, including: (1) the specific
designation of such Debt Securities, including whether the Debt Securities are
Senior Debt Securities or Senior Subordinated Debt Securities; (2) any limit
upon the aggregate principal amount of such Debt Securities; (3) the date or
dates on which the principal of such Debt Securities will mature or the method
of determining such date or dates; (4) the rate or rates (which may be fixed or
variable) at which such Debt Securities will bear interest, if any, or the
method of calculating such rate or rates; (5) the date or dates from which
interest, if any, will accrue or the method by which such date or dates will be
determined; (6) the date or dates on which interest, if any, will be payable and
the record date or dates therefor; (7) the place or places where principal of,
premium, if any, and interest, if any, on such Debt Securities will be payable;
(8) the period or periods within which, the price or prices at which, the
currency or currencies (including currency units) in which, and the terms and
conditions upon which, such Debt Securities may be redeemed, in whole or in
part, at the option of Northwest; (9) the obligation, if any, of Northwest to
redeem or purchase such Debt Securities pursuant to any sinking fund or
analogous provisions, upon the happening of specified events, or at the option
of a holder thereof and the period or periods within which, the price or prices
at which and the terms and conditions upon which, such Debt Securities shall be
redeemed or purchased, in whole or in part, pursuant to such obligations; (10)
the denominations in which such Debt Securities are authorized to be issued;
(11) the currency or currency units for which Debt Securities may be purchased
or in which Debt Securities may be denominated and/or the currency or currency
units in which principal of, premium, if any, and/or interest, if any, on such
Debt Securities will be payable or redeemable and whether Northwest or the
holders of any such Debt Securities may elect to receive payments in respect of
such Debt Securities in a currency or currency units other than that in which
such Debt Securities are stated to be payable or redeemable; (12) if other than
the principal amount thereof, the portion of the principal amount of such Debt
Securities which will be payable upon declaration of the acceleration of the
maturity thereof or the method by which such portion shall be determined; (13)
the person to whom any interest on any such Debt Security shall be payable if
other than the person in whose name such Debt Security is registered on the
applicable record date; (14) any addition to, or modification or deletion of,
any Event of Default or any covenant of Northwest or NWA Corp. specified in the
Indenture with respect to such Debt Securities; (15) the application, if any, of
such means of defeasance or covenant defeasance as may be specified for such
Debt Securities and coupons; (16) whether such Debt Securities are to be issued
in whole or in part in the form of one or more temporary or permanent global
securities and, if so, the identity of the depositary for such global security
or securities; (17) the terms and conditions relating to Warrants issued by
Northwest in connection with or for the purchase of such Debt Securities; (18)
any index used to determine the amount of payments of principal of (and premium,
if any) and interest, if any, on such Debt Securities; (19) any provisions
relating to the exchange of such Debt Securities; and (20) any other special
terms pertaining to such Debt Securities. Unless otherwise specified in the
applicable Prospectus Supplement, the Debt Securities will not be listed on any
securities exchange.
 
    Unless otherwise specified in the applicable Prospectus Supplement, Debt
Securities will be issued in fully registered form without coupons. Where Debt
Securities of any series are issued in bearer form, the special restrictions and
considerations, including special offering restrictions and special Federal
income tax considerations, applicable to any such Debt Securities and to payment
on and transfer and exchange of such Debt Securities will be described in the
applicable Prospectus Supplement. Bearer Debt Securities will be transferable by
delivery.
 
    Debt Securities may be sold at a substantial discount below their stated
principal amount, bearing no interest or interest at a rate which at the time of
issuance is below market rates. Certain Federal income tax
 
                                       5
<PAGE>
consequences and special considerations applicable to any such Debt Securities
will be described in the applicable Prospectus Supplement.
 
    If the purchase price of any Debt Securities is payable in one or more
foreign currencies or currency units or if any Debt Securities are denominated
in one or more foreign currencies or currency units or if the principal of,
premium, if any, or interest, if any, on any Debt Securities is payable in one
or more foreign currencies or currency units, the restrictions, elections,
certain Federal income tax considerations, specific terms and other information
with respect to such issue of Debt Securities and such foreign currency or
currency units will be set forth in the applicable Prospectus Supplement.
 
DENOMINATIONS, PAYMENT, REGISTRATION, TRANSFER AND EXCHANGE
 
    Registered Securities will be issuable in denominations of $1,000 and
integral multiples of $1,000, and Bearer Securities will be issuable in the
denomination of $5,000 or, in each case, in such other denominations and
currencies as may be in the terms of the Debt Securities of any particular
series. Unless otherwise provided in the applicable Prospectus Supplement,
payments in respect of the Debt Securities will be made, subject to any
applicable laws and regulations, in the designated currency at the office or
agency of Northwest maintained for that purpose as Northwest may designate from
time to time, except that, at the option of Northwest, interest payments, if
any, on Debt Securities in registered form may be made (i) by checks mailed by
the Trustee to the holders of Debt Securities entitled thereto at their
registered addresses or (ii) by wire transfer to an account maintained by the
Person entitled thereto as specified in the Register. Unless otherwise indicated
in an applicable Prospectus Supplement, payment of any installment of interest
on Debt Securities in registered form will be made to the Person in whose name
such Debt Security is registered at the close of business on the regular record
date for such interest.
 
    Payment in respect of Debt Securities in bearer form will be payable in the
currency and in the manner designated in the applicable Prospectus Supplement,
subject to any applicable laws and regulations, at such paying agencies outside
the United States as Northwest may appoint from time to time. The paying agents
outside the United States, if any, initially appointed by Northwest for a series
of Debt Securities will be named in the applicable Prospectus Supplement.
Northwest may at any time designate additional Paying Agents or rescind the
designation of any paying agents, except that, if Debt Securities of a series
are issuable as Registered Securities, Northwest will be required to maintain at
least one paying agent in each Place of Payment for such series and, if Debt
Securities of a series are issuable as Bearer Securities, Northwest will be
required to maintain a Paying Agent in a Place of Payment outside the United
States where Debt Securities of such series and any coupons appertaining thereto
may be presented and surrendered for payment. Northwest will have the right to
require a holder of any Debt Security, in connection with the payment of the
principal of, premium, if any, and interest, if any, on such Debt Security, to
certify information to Northwest or, in the absence of such certification,
Northwest will be entitled to rely on any legal presumption to enable Northwest
to determine its duties and liabilities, if any, to deduct or withhold taxes,
assessments or governmental charges from such payment.
 
    Unless otherwise provided in the applicable Prospectus Supplement, Debt
Securities in registered form will be transferable or exchangeable at the agency
of Northwest maintained for such purpose as designated by Northwest from time to
time. Debt Securities may be transferred or exchanged without service charge,
other than any tax or other governmental charge imposed in connection therewith.
 
    In the event of any redemption in part, Northwest shall not be required to
(i) issue, register the transfer of or exchange Debt Securities of any series
during a period beginning at the opening of business 15 days before any
selection of Debt Securities of that series to be redeemed and ending at the
close of business on (A) if Debt Securities of the series are issuable only as
Registered Securities, the day of mailing of the relevant notice of redemption
and (B) if Debt Securities of the series are issuable as Bearer Securities, the
day of the first publication of the relevant notice of redemption or, if Debt
Securities of the series are also issuable as Registered Securities and there is
no publication, the mailing of the relevant
 
                                       6
<PAGE>
notice of redemption; (ii) register the transfer of or exchange any Registered
Securities, or portion thereof, called for redemption or otherwise surrendered
for repayment, except the unredeemed or unrepaid portion of any Registered
Security being redeemed or repaid in part; or (iii) exchange any Bearer Security
called for redemption, except to exchange such Bearer Security for a Registered
Security of that series and like tenor which is immediately surrendered for
redemption.
 
SUBORDINATION OF SENIOR SUBORDINATED DEBT SECURITIES
 
    The obligation of Northwest to make payment on account of the principal of,
premium, if any, and interest, if any, on the Senior Subordinated Debt
Securities will be subordinated and junior in right of payment, as set forth in
the Subordinated Indenture, to the prior payment in full of all Senior
Indebtedness of Northwest. The Senior Subordinated Debt Securities will rank
PARI PASSU with any future Indebtedness of Northwest which by its terms states
that it will rank PARI PASSU with the Senior Subordinated Debt Securities. The
Senior Subordinated Debt Securities will rank senior to all other existing and
future subordinated Indebtedness or other subordinated obligations of Northwest.
Notwithstanding the foregoing, payment from the money or the proceeds of U.S.
Government Obligations held in any defeasance trust described under "Defeasance"
below is not subordinate to any Senior Indebtedness or subject to the
restrictions described herein.
 
    "Senior Indebtedness" of Northwest means all Indebtedness of Northwest
(other than the Senior Subordinated Debt Securities) unless such Indebtedness,
by its terms or the terms of the instrument creating or evidencing it, is
subordinate in right of payment to or PARI PASSU with the Senior Subordinated
Debt Securities; PROVIDED, HOWEVER, that such Senior Indebtedness does not
include (x) any Indebtedness, guarantee or other obligation of Northwest that is
subordinate or junior in any respect to any other Indebtedness of Northwest or
(y) any Indebtedness of Northwest to any of its Subsidiaries or to any Person of
which Northwest is a Subsidiary. "Indebtedness" of any Person means, without
duplication, the principal of, premium, if any, and accrued and unpaid interest
(including post-petition interest, whether or not allowable as a claim in
bankruptcy) on (i) indebtedness of such Person for money borrowed, (ii)
guarantees by such Person of indebtedness for money borrowed by any other
Person, (iii) indebtedness of such Person evidenced by notes, debentures, bonds
or other instruments of indebtedness for payment of which such Person is
responsible or liable, (iv) obligations for the reimbursement of any obligor on
any letter of credit, bankers' acceptance or similar credit transaction, (v)
obligations of such Person under Capital Leases and Flight Equipment leases,
(vi) obligations under interest rate and currency swaps, caps, collars options,
forward or spot contracts or similar arrangements or with respect to foreign
currency hedges or aircraft fuel hedges, (vii) commitment and other bank
financing fees under contractual obligations associated with bank debt, (viii)
any indebtedness representing the deferred and unpaid purchase price of any
property or business, and (ix) all deferrals, renewals, extensions and
refundings of any such indebtedness or obligations; PROVIDED, HOWEVER, that
Indebtedness shall not include amounts owed to trade creditors in the ordinary
course of business, nonrecourse indebtedness secured by real property located
outside the United States or operating lease rental payments (other than Flight
Equipment lease rental payments) in the ordinary course of business.
 
    No payment on account of principal of, premium, if any, or interest on the
Senior Subordinated Debt Securities or deposit pursuant to the provisions
described under "Defeasance" below may be made if (i) any Senior Indebtedness is
not paid when due (following the expiration of any applicable grace period) or
(ii) any other default on Senior Indebtedness occurs and the maturity of any
Senior Indebtedness is accelerated in accordance with its terms unless, in
either case, (a) such failure to pay or acceleration relates to Senior
Indebtedness in an aggregate amount equal to or less than $20 million, (b) the
default has been cured or waived or has ceased to exist, (c) such acceleration
has been rescinded, or (d) such Senior Indebtedness has been paid in full. A
failure to make any payment with respect to the Senior Subordinated Debt
Securities as a result of the foregoing provisions will not limit the right of
the holders of the Senior Subordinated Debt Securities to accelerate the
maturity thereof as a result of such payment default.
 
                                       7
<PAGE>
    Upon any distribution of the assets of Northwest upon any dissolution, total
or partial liquidation or reorganization of or similar proceeding relating to
Northwest, the holders of Senior Indebtedness will be entitled to receive
payment in full before the holders of the Senior Subordinated Debt Securities
are entitled to receive any payment. By reason of such subordination, in the
event of insolvency, creditors of Northwest who are holders of Senior
Indebtedness or of other unsubordinated Indebtedness may recover more, ratably,
than the holders of the Senior Subordinated Debt Securities.
 
THE PARENT GUARANTY
 
    NWA Corp. will unconditionally guarantee, pursuant to Indentures, the due
and punctual payment of the principal of, premium, if any, and interest on the
Debt Securities when the same shall become due, whether by acceleration or
otherwise. The Parent Guaranty will be enforceable without any need first to
enforce Debt Securities against Northwest. The Parent Guaranty of the Senior
Subordinated Debt Securities will be subordinated and junior in right of
payment, as set forth in the Senior Subordinated Debt Securities Indenture, to
the prior payment in full of all Senior Indebtedness of NWA Corp. The terms of
such subordination will parallel the subordination terms applicable to the
Senior Subordinated Debt Securities as set forth above under "Subordination of
Senior Subordinated Debt Securities," except that, for purposes of the Parent
Guaranty, Senior Indebtedness of NWA Corp. means all Indebtedness of NWA Corp.
(other than the Parent Guaranty) unless such Indebtedness, by its terms or by
the terms of the instrument creating or evidencing it, is subordinate in right
of payment to or PARI PASSU with the Parent Guaranty; PROVIDED, HOWEVER, that
such Senior Indebtedness does not include any Indebtedness of NWA Corp. to any
of its subsidiaries. The Parent Guaranty of the Senior Subordinated Debt
Securities will rank PARI PASSU with any future Indebtedness of NWA Corp. which
by its terms states that it will rank PARI PASSU with the Parent Guaranty of the
Senior Subordinated Debt Securities. The Parent Guaranty of the Senior
Subordinated Debt Securities will rank senior to all other existing and future
subordinated Indebtedness or other subordinated obligations of NWA Corp.
 
GLOBAL DEBT SECURITIES
 
    The Debt Securities of a series may be issued in whole or in part in the
form of one or more fully registered global securities (a "Registered Global
Security") that will be deposited with a depositary (the "Depositary") or with a
nominee for the Depositary identified in the applicable Prospectus Supplement.
In such a case, one or more Registered Global Securities will be issued in a
denomination or aggregate denominations equal to the portion of the aggregate
principal amount of outstanding Debt Securities of the series to be represented
by such Registered Global Security or Securities. Unless and until it is
exchanged in whole or in part for Debt Securities in definitive certificated
form, a Registered Global Security may not be registered for transfer or
exchange except as a whole by the Depositary for such Registered Global Security
to a nominee of such Depositary or by a nominee of such Depositary to such
Depositary or another nominee of such Depositary or by such Depositary or any
such nominee to a successor Depositary for such series or a nominee of such
successor Depositary and except in the circumstances described in the applicable
Prospectus Supplement.
 
    The specific terms of the depositary arrangement with respect to any portion
of a series of Debt Securities to be represented by a Registered Global Security
will be described in the applicable Prospectus Supplement. Northwest expects
that the following provisions will apply to depositary arrangements.
 
    Upon the issuance of any Registered Global Security, and the deposit of such
Registered Global Security with or on behalf of the Depositary for such
Registered Global Security, the Depositary will credit, on its book-entry
registration and transfer system, the respective principal amounts of the Debt
Securities represented by such Registered Global Security to the accounts of
institutions ("participants") that have accounts with the Depositary or its
nominee. The accounts to be credited will be designated by the underwriters or
agents engaging in the distribution of such Debt Securities or by Northwest, if
such Debt Securities are offered and sold directly by Northwest. Ownership of
beneficial interests in a Registered
 
                                       8
<PAGE>
Global Security will be limited to participants or persons that may hold
interests through participants. Ownership of beneficial interests by
participants in such Registered Global Security will be shown on, and the
transfer of that ownership interest will be effected only through, records
maintained by the Depositary for such Registered Global Security or by its
nominee. Ownership of beneficial interests in such Registered Global Security by
persons that hold through participants will be shown on, and the transfer of
that ownership interest within such participant will be effected only through,
records maintained by such participant. The laws of some jurisdictions require
that certain purchasers of securities take physical delivery of such securities
in certificated form. The foregoing limitations and such laws may impair the
ability to transfer beneficial interests in such Registered Global Securities.
 
    So long as the Depositary for a Registered Global Security, or its nominee,
is the registered owner of such Registered Global Security, such Depositary or
such nominee, as the case may be, will be considered the sole owner or holder of
the Debt Securities represented by such Registered Global Security for all
purposes under the Indentures. Unless otherwise specified in the applicable
Prospectus Supplement and except as specified below, owners of beneficial
interests in such Registered Global Security will not be entitled to have Debt
Securities of the series represented by such Registered Global Security
registered in their names, will not receive or be entitled to receive physical
delivery of Debt Securities of such series in certificated form and will not be
considered the holders thereof for any purposes under the Indentures.
Accordingly, each person owning a beneficial interest in such Registered Global
Security must rely on the procedures of the Depositary and, if such person is
not a participant, on the procedures of the participant through which such
person owns its interest, to exercise any rights of a holder under the
Indentures. The Depositary may grant proxies and otherwise authorize
participants to give or take any request, demand, authorization, direction,
notice, consent, waiver or other action which a holder is entitled to give or
take under the Indentures. Northwest understands that, under existing industry
practices, if Northwest requests any action of holders or an owner of a
beneficial interest in which Registered Global Security desires to give any
notice or take any action a holder is entitled to give or take under the
Indentures, the Depositary would authorize the participants to give such notice
or take such action, and participants would authorize beneficial owners owning
through such participants to give such notice or take such action or would
otherwise act upon the instructions of beneficial owners owning through them.
 
    Unless otherwise specified in the applicable Prospectus Supplement, payments
with respect to principal, premium, if any, and interest, if any, on Debt
Securities represented by a Registered Global Security registered in the name of
a Depositary or its nominee will be made to such Depositary or its nominee, as
the case may be, as the registered owner of such Registered Global Security.
 
    Northwest expects that the Depositary for any Debt Securities represented by
a Registered Global Security, upon receipt of any payment of principal, premium
or interest, will immediately credit participants' accounts with payments in
amounts proportionate to their respective beneficial interests in the principal
amount of such Registered Global Security as shown on the records of such
Depositary. Northwest also expects that payments by participants to owners of
beneficial interests in such Registered Global Security held through such
participants will be governed by standing instructions and customary practices,
as is now the case with the securities held for the accounts of customers
registered in "street names," and will be the responsibility of such
participants. None of Northwest, NWA Corp., the Trustee or any agent of
Northwest shall have any responsibility or liability for any aspect of the
records relating to or payments made on account of beneficial ownership
interests of a Registered Global Security, or for maintaining, supervising or
reviewing any records relating to such beneficial ownership interests.
 
    Unless otherwise specified in the applicable Prospectus Supplement, if the
Depositary for any Debt Securities represented by a Registered Global Security
is at any time unwilling or unable to continue as Depositary and a successor
Depositary is not appointed by Northwest within ninety days, Northwest will
issue such Debt Securities in definitive certificated form in exchange for such
Registered Global Security. In addition, Northwest may at any time and in its
sole discretion determine not to have any of the Debt Securities of a series
represented by one or more Registered Global Securities and, in such event, will
issue
 
                                       9
<PAGE>
Debt Securities of such series in definitive certificated form in exchange for
all of the Registered Global Securities representing such Debt Securities.
Further, if Northwest so specifies with respect to the Debt Securities of a
series, an owner of a beneficial interest in a Registered Global Security
representing Debt Securities of such series may, on terms acceptable to
Northwest and the Depositary for such Registered Global Security, receive Debt
Securities of such series in definitive form registered in the name of such
beneficial owner or its designee.
 
CONSOLIDATION, MERGER OR SALE BY NORTHWEST OR NWA CORP.
 
    Each Indenture provides that neither Northwest nor NWA Corp. may merge or
consolidate with or into any other corporation or sell, convey, transfer, lease
or otherwise dispose of all or substantially all of its assets to any Person,
unless (i) (a) in the case of a merger or consolidation, Northwest or NWA Corp.
is the surviving corporation, as the case may be, or (b) in the case of a merger
or consolidation where Northwest or NWA Corp. is not the surviving corporation
and in the case of such a sale, conveyance or other disposition, the resulting,
successor or acquiring Person is a corporation organized and existing under the
laws of the United States of America or a State thereof or the District of
Columbia and such corporation expressly assumes by supplemental indenture all
the obligations of Northwest under the Debt Securities and any coupons
appertaining thereto (or of NWA Corp. under the Parent Guaranty, as the case may
be) and the obligations of Northwest or NWA Corp., as the case may be, under the
Indentures, (ii) immediately after giving effect to such merger or
consolidation, or such sale, conveyance, transfer, lease or other disposition
(including, without limitation, any Debt directly or indirectly incurred or
anticipated to be incurred in connection with or in respect of such
transaction), no Default or Event of Default shall have occurred and be
continuing and (iii) certain other conditions are met. In the event a successor
corporation assumes the obligations of Northwest or NWA Corp., as the case may
be, such successor corporation shall succeed to and be substituted for Northwest
or NWA Corp. as the case may be, under the Indentures and under the Debt
Securities and any coupons appertaining thereto and all obligations of Northwest
or NWA Corp., as the case may be, shall terminate. In the event of any such
permitted consolidation, merger, sale, conveyance, disposition or other change
of control transaction (including a highly leveraged transaction), the holders
of the Debt Securities will not have the right to require redemption thereof or
similar rights unless otherwise provided in the applicable Prospectus
Supplement.
 
EVENTS OF DEFAULT, NOTICE AND CERTAIN RIGHTS ON DEFAULT
 
    Events of Default with respect to Debt Securities of any series issued
thereunder are defined in the Indentures as being: default for thirty days in
payment of any interest on any Debt Security of that series or any coupon
appertaining thereto or any additional amount payable with respect to Debt
Securities of such series as specified in the applicable Prospectus Supplement
when due; default in payment of principal, premium, if any, or on redemption or
otherwise, or in the making of a mandatory sinking fund payment of any Debt
Securities of that series when due; default for sixty days after notice to
Northwest or NWA Corp., as applicable, by the Trustee for such series, or by the
holders of 25% in aggregate principal amount of the Debt Securities of such
series then outstanding, in the performance of any other agreement applicable to
the Debt Securities of that series, in the Indenture or in any supplemental
indenture or board resolution referred to therein under which the Debt
Securities of that series may have been issued; and certain events of
bankruptcy, insolvency or reorganization of Northwest or NWA Corp. Any other
Events of Default applicable to a specified series of Debt Securities will be
described in the applicable Prospectus Supplement. An Event of Default with
respect to a particular series of Debt Securities will not necessarily be an
Event of Default with respect to any other series of Debt Securities.
 
    The Indentures provide that, if an Event of Default specified therein occurs
with respect to the Debt Securities of any series issued thereunder and is
continuing, the Trustee for such series or the holders of 25% in aggregate
principal amount of all of the outstanding Debt Securities of that series, by
written notice
 
                                       10
<PAGE>
to Northwest (and to the Trustee for such series, if notice is given by such
holders of Debt Securities), may declare the principal (or, if the Debt
Securities of that series are original issue discount Debt Securities or indexed
Debt Securities, such portion of the principal amount specified in the
applicable Prospectus Supplement) of all the Debt Securities of that series to
be due and payable.
 
    The Indentures provide that the Trustee for any series of Debt Securities
shall, within ninety days after the occurrence of a Default known to it with
respect to Debt Securities of that series, give to the holders of the Debt
Securities of that series notice of all such uncured Defaults; PROVIDED, that
such notice shall not be given until 60 days after the occurrence of a Default
with respect to Debt Securities of that series involving a failure to perform a
covenant other than the obligation to pay principal, premium, if any, or
interest or make a mandatory sinking fund payment; and PROVIDED FURTHER, that,
except in the case of default in payment on the Debt Securities of that series,
the Trustee may withhold the notice if and so long as a committee of its
Responsible Officers (as defined therein) in good faith determines that
withholding such notice is in the interest of the holders of the Debt Securities
of that series. "Default" means any event which is, or, after notice or passage
of time or both, would be, an Event of Default.
 
    The Indentures provide that the Trustee will be under no obligation to
exercise any of its rights or powers under such Indenture at the request or
direction of any of the Holders, unless such Holders shall have offered to the
Trustee reasonable indemnity. Subject to such provisions for indemnification of
the Trustee, the Indentures provide that the holders of not less than a majority
in aggregate principal amount
of the Debt Securities of each series affected (with each such series voting as
a class) may direct the time, method and place of conducting any proceeding for
any remedy available to the Trustee for such series, or exercising any trust or
power conferred on such Trustee.
 
    The Indentures include a covenant that Northwest will file annually with the
Trustee a certificate as to Northwest's compliance with all conditions and
covenants of the applicable Indenture.
 
    The holders of not less than a majority in aggregate principal amount of any
series of Debt Securities by notice to the Trustee for such series may waive, on
behalf of the holders of all Debt Securities of such series, any past Default or
Event of Default with respect to that series and its consequences, and may
rescind and annul a declaration of acceleration with respect to that series
(unless a judgment or decree based on such acceleration has been obtained and
entered), except a Default or Event of Default in the payment of the principal
of, premium, if any, or interest, if any, on any Debt Security (and any
acceleration resulting therefrom) and certain other defaults.
 
MODIFICATION OF THE INDENTURES
 
    The Indentures contain provisions permitting Northwest, NWA Corp. and the
Trustee to enter into one or more supplemental indentures without the consent of
the holders of any of the Debt Securities in order (i) to evidence the
succession of another corporation to Northwest or NWA Corp. and the assumption
of the covenants of Northwest or NWA Corp. by a successor; (ii) to add to the
covenants of Northwest or NWA Corp. or surrender any right or power of Northwest
or NWA Corp.; (iii) to add additional Events of Default with respect to any
series; (iv) to add or change any provisions to such extent as necessary to
permit or facilitate the issuance of Debt Securities in bearer form or in global
form; (v) under certain circumstances to add to, change or eliminate any
provision affecting Debt Securities not yet issued; (vi) to secure the Debt
Securities; (vii) to establish the form or terms of Debt Securities; (viii) to
evidence and provide for successor Trustees; (ix) if allowed without penalty
under applicable laws and regulations, to permit payment in respect of Debt
Securities in bearer form in the United States; (x) to correct or supplement any
inconsistent provisions or to make any other provisions with respect to matters
or questions arising under the Indentures, PROVIDED that such action does not
adversely affect the interests of any holder of Debt Securities of any series
issued under such Indentures in any material respect; or (xi) to cure any
ambiguity or correct any mistake.
 
                                       11
<PAGE>
    The Indentures also contain provisions permitting Northwest, NWA Corp. and
the Trustee, with the consent of the holders of a majority in aggregate
principal amount of the outstanding Debt Securities of each series affected by
such supplemental indenture, to execute supplemental indentures adding any
provisions to or changing or eliminating any of the provisions of the Indentures
or any supplemental indenture or modifying the rights of the holders of Debt
Securities of such series, except that no such supplemental indenture may,
without the consent of the holder of each Debt Security so affected, (i) change
the time for payment of principal or interest on any Debt Security; (ii) reduce
the principal of, or any installment of principal of, or interest on any Debt
Security; (iii) reduce the amount of premium, if any, payable upon the
redemption of any Debt Security; (iv) reduce the amount of principal payable
upon acceleration of the maturity of an Original Issue Discount Debt Security;
(v) change the coin or currency in which any Debt Security or any premium or
interest thereon is payable; (vi) impair the right to institute suit for the
enforcement of any payment on or with respect to any Debt Security; (vii) reduce
the percentage in principal amount of the outstanding Debt Securities of any
series the consent of whose holders is required for modification or amendment of
the Indentures or for waiver of compliance with certain provisions of the
Indentures or for waiver of certain defaults; (viii) change the obligation of
Northwest to maintain an office or agency in the places and for the purposes
specified in the Indentures; (ix) modify the obligations of NWA Corp. to make
payment under the Parent Guaranty; or (x) modify any of the foregoing
provisions.
 
DEFEASANCE
 
    If indicated in the applicable Prospectus Supplement, Northwest may elect
either (i) to defease and be discharged from any and all obligations with
respect to the Debt Securities of or within any series (except as described
below) ("defeasance") or (ii) to be released from its obligations with respect
to certain covenants applicable to the Debt Securities of or within any series
("covenant defeasance"), upon the deposit with the Trustee for such series (or
other qualifying trustee), in trust for such purpose, of money and/or Government
Obligations which through the payment of principal and interest in accordance
with their terms will provide money in the amount sufficient to pay the
principal of, premium, if any, and interest on such Debt Securities to Maturity
or redemption, as the case may be, and any mandatory sinking fund or analogous
payments thereon. Upon the occurrence of a defeasance, Northwest will be deemed
to have paid and discharged the entire indebtedness represented by such Debt
Securities and any coupons appertaining thereto and to have satisfied all of its
other obligations under such Debt Securities and any coupons appertaining
thereto (except for (i) the rights of holders of such Debt Securities to
receive, solely from the trust funds deposited to defease such Debt Securities,
payments in respect of the principal of, premium, if any, and interest, if any,
on such Debt Securities or any coupons appertaining thereto when such payments
are due and (ii) certain other obligations as provided in the Indentures). Upon
the occurrence of a covenant defeasance, Northwest will be released only from
its obligations to comply with certain covenants contained in the Indenture
relating to such Debt Securities, will continue to be obligated in all other
respects under such Debt Securities and will continue to be contingently liable
with respect to the payment of principal, interest, if any, and premium, if any,
with respect to such Debt Securities.
 
    Unless otherwise specified in the applicable Prospectus Supplement and
except as described below, the conditions to both defeasance and covenant
defeasance are as follows: (i) such defeasance or covenant defeasance must not
result in a breach or violation of, or constitute a Default or Event of Default
under, the applicable Indenture, or result in a breach or violation of, or
constitute a default under, any other material agreement or instrument of
Northwest; (ii) certain bankruptcy related Defaults or Events of Default with
respect to Northwest must not have occurred and be continuing during the period
commencing on the date of the deposit of the trust funds to defease such Debt
Securities and ending on the 91st day after such date; (iii) Northwest must
deliver to the Trustee an Opinion of Counsel to the effect that the holders of
such Debt Securities will not recognize income, gain or loss for Federal income
tax purposes as a result of such defeasance or covenant defeasance and will be
subject to Federal income tax on the same amounts and in the same manner and at
all the same times as would have been the case if such defeasance
 
                                       12
<PAGE>
or covenant defeasance had not occurred (such Opinion of Counsel, in the case of
defeasance, must refer to and be based upon a ruling of the Internal Revenue
Service or a change in applicable Federal income tax law occurring after the
date of the Indentures); (iv) Northwest must deliver to the Trustee an Officers'
Certificate and an Opinion of Counsel with respect to compliance with the
conditions precedent to such defeasance or covenant defeasance and with respect
to certain registration requirements under the Investment Company Act of 1940,
as amended; and (v) any additional conditions to such defeasance or covenant
defeasance which may be imposed on Northwest pursuant to the applicable
Indenture. The Indentures require that a nationally recognized firm of
independent public accountants deliver to the Trustee a written certification as
to the sufficiency of the trust funds deposited for the defeasance or covenant
defeasance of such Debt Securities. The Indentures do not provide the holders of
such Debt Securities with recourse against such firm. If indicated in the
applicable Prospectus Supplement, in addition to obligations of the United
States or an agency or instrumentality thereof, Government Obligations may
include obligations of the government or any agency or instrumentality of the
government issuing the currency in which Debt Securities of such series are
payable. In the event that Government Obligations deposited with the Trustee for
the defeasance of such Debt Securities decrease in value or default subsequent
to their being deposited, Northwest will have no further obligation, and the
holders of such Debt Securities will have no additional recourse against
Northwest, as a result of such decrease in value or default. As described above,
in the event of a covenant defeasance, Northwest remains contingently liable
with respect to the payment of principal, interest, if any, and premium, if any,
with respect to the Debt Securities.
 
    Northwest may exercise its defeasance option with respect to such Debt
Securities notwithstanding its prior exercise of its covenant defeasance option.
If Northwest exercises its defeasance option, payment of such Debt Securities
may not be accelerated because of a Default or an Event of Default. If Northwest
exercises its covenant defeasance option, payment of such Debt Securities may
not be accelerated by reason of a Default or an Event of Default with respect to
the covenants to which such covenant defeasance is applicable. However, if such
acceleration were to occur, the realizable value at the acceleration date of the
money and Government Obligations in the defeasance trust could be less than the
principal and interest then due on such Debt Securities, in that the required
deposit in the defeasance trust is based upon scheduled cash flow rather than
market value, which will vary depending upon interest rates and other factors.
 
    The applicable Prospectus Supplement may further describe the provisions, if
any, applicable to defeasance or covenant defeasance with respect to Debt
Securities of a particular series.
 
THE TRUSTEE
 
    State Street Bank & Trust Company, successor to The First National Bank of
Boston, is the Trustee under the Indentures. Northwest and NWA Corp. also
maintain banking and other commercial relationships with State Street Bank &
Trust Company, successor to The First National Bank of Boston, and its
affiliates in the ordinary course of business and State Street Bank & Trust
Company, successor to The First National Bank of Boston, acts as Trustee under
several other indentures for NWA Corp. and Northwest.
 
                            DESCRIPTION OF WARRANTS
 
    Northwest may issue Warrants for the purchase of Debt Securities. Warrants
may be issued together with or separately from any Debt Securities offered by
any Prospectus Supplement and, if issued together with Debt Securities, may be
attached to or separate from such Debt Securities. The Warrants are to be issued
under one or more separate Warrant Agreements (a "Warrant Agreement") to be
entered into between Northwest and State Street Bank & Trust Company, successor
to The First National Bank of Boston, as Warrant Agent, all as set forth in the
Prospectus Supplement relating to the particular issue of Warrants. The Warrant
Agent will act solely as an agent of Northwest in connection with the Warrants
and will not assume any obligation or relationship of agency or trust for or
with any holders of Warrants or
 
                                       13
<PAGE>
beneficial owners of Warrants. The statements herein relating to the Warrants
and the Warrant Agreements are summaries and reference is made to the detailed
provisions of the Warrant Agreements. A form of Warrant Agreement for Warrants
Sold Attached to Debt Securities and a form of Warrant Agreement for Warrants
Sold Alone have been incorporated by reference as exhibits to the Registration
Statement.
 
GENERAL
 
    If Warrants are offered, reference is made to the applicable Prospectus
Supplement which accompanies this Prospectus for a description of the specific
terms of the Warrants being offered thereby, including (i) the specific
designation and aggregate number of such Warrants, (ii) the offering price and
the currency or composite currencies for which Warrants may be purchased, (iii)
the designation (including whether the Debt Securities are Senior Debt
Securities or Senior Subordinated Debt Securities), aggregate principal amount,
currency or composite currencies and terms of the Debt Securities purchasable
upon exercise of the Warrants, (iv) if applicable, the designation and terms of
the Debt Securities with which the Warrants are issued and the number of
Warrants issued with the minimum denomination of each such Debt Security, (v) if
applicable, the date on and after which the Warrants and the related Debt
Securities will be separately transferable, (vi) the principal amount of Debt
Securities purchasable upon exercise of one Warrant and the price or the manner
of determining the price and currency or composite currencies or other
consideration (which may include Debt Securities) for which such principal
amount of Debt Securities may be purchased upon such exercise, (vii) the date on
which the right to exercise the Warrants shall commence and the date on which
such right shall expire (the "Expiration Date"), (viii) the terms of any
mandatory or optional redemption by Northwest, (ix) certain Federal income tax
consequences, (x) whether the certificates for Warrants will be issued in
registered or unregistered form, and (xi) any other special terms pertaining to
such Warrants. Unless otherwise specified in the applicable Prospectus
Supplement, the Warrants will not be listed on any securities exchange.
 
    Warrant certificates may be exchanged for new Warrant certificates of
different denominations, may (if in registered form) be presented for
registration of transfer and exchange and may be exercised at an office or
agency of the Warrant Agent maintained for that purpose (the "Warrant Agent
Office"). No service charge will be made for any transfer or exchange of Warrant
certificates, but Northwest may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith. Prior to the
exercise of their Warrants, holders of Warrants will not have any of the rights
of holders of the Debt Securities purchasable upon such exercise, including the
right to receive payments of principal of, premium, if any, or interest, if any,
on the Debt Securities purchasable upon such exercise or to enforce covenants in
the Indenture.
 
    The Warrant Agent will act solely as an agent of Northwest in connection
with the Warrants and will not assume any obligation or relationship of agency
or trust for or with any holders of Warrants or beneficial owners of Warrants.
 
EXERCISE OF WARRANTS
 
    Each Warrant will entitle the holder to purchase such principal amount of
Debt Securities at such exercise price, for such consideration and during such
period or periods as shall in each case be set forth in, or calculable from, the
Prospectus Supplement relating to the Warrants. Warrants may be exercised at any
time during such period up to 5:00 P.M. New York City time on the Expiration
Date set forth in the Prospectus Supplement relating to such Warrants. After the
close of business on the Expiration Date (or such later date to which such
Expiration Date may be extended by Northwest), unexercised Warrants will become
void.
 
    Warrants may be exercised by delivery to the Warrant Agent of payment as
provided in the applicable Prospectus Supplement of the amount required to
purchase the Debt Securities purchasable upon such exercise together with
certain information set forth on the reverse side of the Warrant certificate.
Unless
 
                                       14
<PAGE>
otherwise provided in the applicable Prospectus Supplement, upon receipt of such
payment and the Warrant certificate properly completed and duly executed at the
Warrant Agent Office or any other office or agency indicated in the applicable
Prospectus Supplement, Northwest will, as soon as practicable, issue and deliver
the Debt Securities purchasable upon such exercise. If fewer than all of the
Warrants represented by such Warrant certificate are exercised, a new Warrant
certificate will be issued for the amount of unexercised Warrants.
 
MODIFICATION OF WARRANT AGREEMENTS
 
    The Warrant Agreements contain a provision permitting Northwest and the
Warrant Agent, without the consent of any Warrantholder, to supplement or amend
the Warrant Agreement in order to cure any ambiguity, and to correct or
supplement any provision contained therein which may be defective or
inconsistent with any other provisions or to make other provisions in regard to
matters or questions arising thereunder which Northwest and the Warrant Agent
may deem necessary or desirable and which do not adversely affect the interests
of the Warrantholders.
 
WARRANT AGENT
 
    State Street Bank & Trust Company, successor to The First National Bank of
Boston will act as the Warrant Agent under the Warrant Agreement. Northwest and
NWA Corp. maintain banking and other commercial relationships with the First
National Bank of Boston and its affiliates in the ordinary course of business.
 
                          DESCRIPTION OF CAPITAL STOCK
 
    The following descriptions and the descriptions contained in "Description of
Series A, Series B, Series C and Series D Preferred Stock and Rights" are
summaries, and reference is made to the provisions of NWA Corp.'s Restated
Certificate of Incorporation and bylaws and the agreements referred to in such
descriptions, copies of which have been filed as exhibits to the Registration
Statement of which this Prospectus is a part.
 
    The authorized capital stock of NWA Corp. consists of 360,020,000 shares, of
which 250,000,000 shares have been designated as Class A Common Stock,
65,000,000 shares have been designated as Class B Common Stock, and 45,020,000
shares have been designated as preferred stock. Of such authorized shares of
preferred stock, 10,000 shares have been designated Series A Preferred Stock,
$.01 par value per share (the "Series A Preferred Stock"), 10,000 shares have
been designated Series B Preferred Stock, $.01 par value per share (the "Series
B Preferred Stock"), 25,000,000 shares have been designated Series C Preferred
Stock, $.01 par value per share (the "Series C Preferred Stock"), 3,000,000
shares have been designated Series D Junior Participating Preferred Stock, $.01
par value per share (the "Series D Preferred Stock"), and 17,000,000 shares are
undesignated.
 
    The preferred stock has preference over the Common Stock with respect to the
payment of dividends and the distribution of assets in the event of a
liquidation or dissolution of the Company. In addition, the Board of Directors
of NWA Corp. has the authority to issue additional preferred stock in one or
more series and to fix the voting and other powers, designations, dividends,
preferences and relative, participating, optional, conversion, exchange,
redemption and other special rights and qualifications, limitations or
restrictions thereon of any such series of preferred stock.
 
                                       15
<PAGE>
            DESCRIPTION OF SERIES A, SERIES B, SERIES C AND SERIES D
                           PREFERRED STOCK AND RIGHTS
 
SERIES A PREFERRED STOCK
 
    As of July 31, 1996, 1,308.8 shares of Series A Preferred Stock were
outstanding, all of which were held by KLM and by a trust for the benefit of
KLM. Each share of Series A Preferred Stock is entitled to a preference in
voluntary and involuntary liquidation in the amount of $50,000 per share, plus
accrued and unpaid dividends. Each share of Series A Preferred Stock is entitled
to one vote at all meetings of stockholders of the Company for the election of
directors (other than directors elected by the holders of Series C Preferred
Stock).
 
    The Company is obligated to redeem the Series A Preferred Stock, including
accrued and unpaid dividends, in three equal annual installments on August 1,
2000, 2001 and 2002. The dividend rate on the Series A Preferred Stock is 8% per
annum on the per share liquidation amount. Dividends accrue semi-annually during
the five-year period commencing on August 1, 1993 and are subsequently payable
upon redemption of the Series A Preferred Stock. After August 1, 1998 (at which
date the aggregate liquidation preference of the Series A Preferred Stock is
expected to be approximately $425 million), dividends are payable in cash. To
the extent cash dividends are not paid when due, the annual dividend rate will
increase by 0.5% every six months with a maximum dividend rate of 10%. Cash
dividends are cumulative if unpaid.
 
    The Series A Preferred Stock ranks senior to the Series B, Series C and
Series D Preferred Stock and all classes of Common Stock with respect to
liquidation and dividend rights. At any time, at the option of the Company, the
Series A Preferred Stock is redeemable (in whole only). All outstanding shares
of Series A Preferred Stock must have been previously redeemed before an
optional redemption of any Series B or Series C Preferred Stock is permitted.
 
    In the event that the Company is in default with respect to payment on the
shares of Series A Preferred Stock, and if, as a result of the Company's failure
to redeem the Series C Preferred Stock in accordance with its terms, additional
Series C Directors are added to the Board of Directors as the representative of
such defaulted series, then a majority of the holders of the Series A Preferred
Stock, voting as a separate series, will, if such series is in default,
thereupon be entitled to elect one additional director as the representative of
such defaulted series.
 
SERIES B PREFERRED STOCK
 
    As of July 31, 1996, 2,163.2 shares of Series B Preferred Stock were
outstanding. Of such shares, 436.2 shares were beneficially owned by KLM and
1,727 shares were owned by Blum.
 
    Each share of Series B Preferred Stock is entitled to a preference in
voluntary and involuntary liquidation in the amount of $50,000 per share, plus
accrued and unpaid dividends. Each share of Series B Preferred Stock is entitled
to one vote at all meetings of stockholders of the Company for the election of
directors (other than directors elected by the holders of Series C Preferred
Stock).
 
    The Company is obligated to redeem the Series B Preferred Stock, including
accrued and unpaid dividends, in three equal annual installments on August 1,
2001, 2002 and 2003. The dividend rate on the Series B Preferred Stock is 8% per
annum on the per share liquidation amount. Dividends accrue semi-annually during
the five-year period commencing on August 1, 1993 and are subsequently payable
upon redemption of the Series B Preferred Stock. After August 1, 1998 (at which
date the aggregate liquidation preference of the Series B Preferred Stock is
expected to be approximately $380 million), dividends are payable in cash. To
the extent cash dividends are not paid when due, the annual dividend rate will
increase by 0.5% every six months with a maximum dividend rate of 10%. Cash
dividends are cumulative if unpaid.
 
    The Series B Preferred Stock ranks junior to the Series A Preferred Stock
and senior to the Series C and Series D Preferred Stock and all classes of
Common Stock with respect to liquidation and dividend
 
                                       16
<PAGE>
rights. At any time at the option of the Company, the Series B Preferred Stock
is redeemable (in whole or in $50 million increments). All outstanding shares of
Series A Preferred Stock must have been previously redeemed before an optional
redemption of any Series B or Series C Preferred Stock is permitted. All
outstanding shares of Series B Preferred Stock must have been previously
redeemed before an optional redemption of any Series C Preferred Stock is
permitted.
 
    In the event that the Company is in default with respect to payment of the
shares of Series B Preferred Stock, and if, as a result of the Company's failure
to redeem the Series C Preferred Stock in accordance with its terms, additional
Series C Directors are added to the Board of Directors, then a majority of the
holders of the Series B Preferred Stock, voting as a separate series, will, if
such series is in default, thereupon be entitled to elect one additional
director as the representative of such defaulted series.
 
SERIES C PREFERRED STOCK
 
    GENERAL
 
    Pursuant to Equity Letter Agreements entered into by the Company with the
several unions representing the Company's employees, the Company agreed to
contribute in installments to the Employee Trusts for the benefit of its
employees (including management and certain other employees not represented by
any union) 18,214,419 shares of Series C Preferred Stock. The Employee Trusts
were established under the Northwest Airlines Corporation Employee Stock Plan
(the "Plan"), which is a qualified profit-sharing plan for purposes of ERISA.
The Company agreed to issue such shares as part of an overall revised
compensation plan for the Company's employees.
 
    CONVERSION RIGHTS
 
    Each share of Series C Preferred Stock is convertible at any time prior to
redemption into 1.3640 shares of Common Stock, currently consisting of 1.2967
shares of Class A Common Stock and 0.0673 shares of Class B Common Stock. The
respective number of shares of Class A and Class B Common Stock issuable upon
conversion will be adjusted to the extent necessary to correspond to the then
existing ratio of Class A Common Stock to Class B Common Stock issued to
Original Investors.
 
    The Equity Letter Agreements also provided for a "Special Conversion Option"
which, if elected, would result in the Employee Trusts receiving Common Stock at
the rate of 1.9096 shares of Common Stock (rather than 1.3640) for each share of
Series C Preferred Stock that they would otherwise receive. The Special
Conversion Option expired on February 9, 1994. On that day, certain employee
groups elected to exercise the Special Conversion Option. As a result, the total
stock to be contributed to the Employee Trusts, based on current projections,
consists of 8,905,126 shares of Series C Preferred Stock, 16,900,343 shares of
Special Voting Class A Common Stock and 876,682 shares of Class B Common Stock,
which in the aggregate represents 22.7% of the Company's voting shares
outstanding as of July 31, 1996.
 
    The Employee Trusts and Qualified Holders may only convert Class B Common
Stock into Class A Common Stock at such time and in such amounts as is necessary
to preserve the ratio of the number of outstanding shares of Class A Common
Stock then outstanding to the number of shares of outstanding Class B Common
Stock issued to Original Investors. Upon any sale or transfer by a Qualified
Holder to a person who is not a Qualified Holder of shares of Series C Preferred
Stock or shares of Class B Common Stock received upon conversion of such Series
C Preferred Stock, such shares will automatically convert into shares of Class A
Common Stock.
 
    PUT RIGHT
 
    During the 60-day period ending ten years after August 1, 1993 (the "Put
Date"), the Employee Trusts and other "Qualified Holders" of the Series C
Preferred Stock (generally consisting of current and former Northwest employees
and their spouses, children and heirs) will have the right to put such stock to
the
 
                                       17
<PAGE>
Company. Prior to the commencement of such 60-day period, the Company will have
the right to elect either (i) to repurchase such Series C Preferred Stock with
cash equal to the Put Price (defined below) or with shares of Class A Common
Stock having an aggregate trading value (based on the average closing prices for
Class A Common Stock during the 30-day period ending on the Put Date) equal to
the Put Price, or (ii) to permit the relevant Employee Trust or Qualified Holder
either (A) to receive the number of shares of Common Stock into which such
Series C Preferred Stock would otherwise then be convertible plus the "Excess
Amount" (as defined below) in cash, or (B) to have such number of shares of
Common Stock otherwise issuable upon conversion sold by the Company, whereupon
the relevant Employee Trust or Qualified Holder would receive in cash the
proceeds realized upon such sale plus the Excess Amount.
 
    Notwithstanding the foregoing, any election by the Company to provide those
exercising put rights with shares of Common Stock in lieu of cash (as described
in clause (i) above) would require the approval of a majority of the Series C
Directors (such directors being described under "Voting Rights" below). Any
decision by the Company not to repurchase any shares of Series C Preferred Stock
as described above requires the consent of a majority of the Series C Directors.
 
    The "Put Price" in 2003 of the Series C Preferred Stock will be equal to an
estimated $381 million (which is the estimated actual labor cost savings based
on the Company's current operating plan, reduced by the portion of such actual
labor cost savings that would have been applicable to those shares of Series C
Preferred Stock that have been converted), divided by the number of shares of
Series C Preferred Stock issued by the Company, plus accrued and unpaid
dividends on the Series C Preferred Stock, if any. The actual labor cost savings
is calculated as the excess of the amount the Company would have paid its
employees in basic hourly wages during the period covered by the labor cost
savings absent the labor cost savings over the amount actually paid, together
with certain savings in respect of reduced vacation accruals and certain work
rule changes.
 
    The "Excess Amount" for each share of Series C Preferred Stock as to which
the put right is exercised (which Excess Amount may be payable when the Company
has elected the mechanism described in clause (ii) of the third preceding
paragraph) is equal to the excess of (i) the Put Price over (ii) the specified
market price per share of the Class A Common Stock received pursuant to such
clause (ii), multiplied by the number of shares of Common Stock into which one
share of Series C Preferred Stock may then be converted.
 
    In the event the Company fails to fulfill its mandatory redemption
obligations as described above, on a quarterly basis thereafter the Company must
use all cash held by the Company (or available under revolving credit
agreements) in excess of all the Company's then currently anticipated cash needs
for operations and capital requirements within one year of such determination
date ("Available Cash") to make partial pro rata redemptions, provided such
redemptions are not prohibited under applicable credit agreements or the
Certificate of Designation for the Series A Preferred Stock or the Series B
Preferred Stock. Cash held by NWA Corp.'s subsidiaries will be included in the
calculation of Available Cash only to the extent such cash is made available to
NWA Corp. pursuant to applicable law or any loan agreements or instruments to
which NWA Corp. or any of its subsidiaries is a party or is subject.
 
    DIVIDENDS
 
    The "Dividend Date" for the Series C Preferred Stock is August 1 of each
year. If the Class A Common Stock is listed on the New York or American Stock
Exchange or quoted on the National Association of Securities Dealers Automated
Quotations System on the business day preceding a Dividend Date, no dividend
will accrue on the Series C Preferred Stock in respect of the year then ended.
If the Class A Common Stock is not so listed or quoted on such business day, on
the following Dividend Date each share of Series C Preferred Stock will accrue a
cumulative dividend for the year then ended equal to 5% of (i) the actual labor
cost savings realized by the Company from August 1, 1993 to such Dividend Date
plus the aggregate amount of previously accrued dividends on such Series C
Preferred Stock, divided by
 
                                       18
<PAGE>
(ii) the total number of shares of Series C Preferred Stock being issued by the
Company. Because the Class A Common Stock is approved for quotation on the
Nasdaq National Market, no dividends have accrued on the Series C Preferred
Stock.
 
    In the event the Company fails to fulfill its mandatory redemption
obligation described above, as of the Put Date the Series C Preferred Stock will
begin to accrue a cumulative dividend payable quarterly at a rate equal to the
greater of 12% per annum or the highest default dividend rate then payable on
any series of Preferred Stock of the Company.
 
    VOTING RIGHTS
 
    The Series C Preferred Stock will vote in parity with the Class A Common
Stock on all matters submitted to stockholders for vote, except that with
respect to the election of directors the Series C Preferred Stock has the
special voting rights described below. Each share of Series C Preferred Stock
will have a number of votes equal to (i) (A) the total number of shares of
Series C Preferred Stock issued or to be issued by the Company or, if greater,
the number of shares of Class A Common Stock into which all such shares of
Series C Preferred Stock (including any shares of Series C Preferred Stock not
yet issued or already converted) would be convertible at such time under the
Equity Letter Agreements, minus (B) the total number of shares of Series C
Preferred Stock which prior to that time have been converted into shares of
Common Stock or, if greater, the number of shares of Class A Common Stock into
which those shares would be convertible at that time if they had not previously
been converted, divided by (ii) the total number of shares of Series C Preferred
Stock then outstanding. While the final contribution of stock to the Employee
Trusts is not scheduled to occur until March 1997, as a result of the special
voting rights of the Series C Preferred Stock, the outstanding shares have the
right to vote as if all shares of Series C Preferred Stock to be issued to the
Employee Trusts have been issued.
 
    With respect to the election of directors, the Series C Preferred Stock
voting as a separate class is entitled to elect three Series C Directors, one of
whom is to be nominated by the International Brotherhood of Teamsters,
Chauffeurs, Warehousemen and Helpers of America ("IBT"), one by the
International Association of Machinists and Aerospace Workers ("IAM") and one by
the Northwest Master Executive Council (the "Northwest MEC") of the Air Line
Pilots Association International ("ALPA"). In addition, until July 31, 2003, the
number of Series C Directors will be the greater of three or the number that
represents at least 15% of the Company's directors.
 
    In the event the Company fails to fulfill its mandatory redemption
obligation described above, the number of Series C Directors will be increased
to the greater of (i) three more than the number of Series C Directors then
serving on the Company's Board of Directors, and (ii) the number of directors
that would cause the proportion of Series C Directors to the total number of
directors to be equal to the proportion of the total voting power of all shares
of Series C Preferred Stock then outstanding to the total voting power of all
shares of all voting capital stock of the Company then outstanding.
 
    If the holders of Series C Preferred Stock are entitled to elect more than
three directors, the Northwest MEC, the IBT and the IAM will each be entitled to
nominate one-third of the Series C Directors, and if the total number of Series
C Directors is not a multiple of three, any remaining Series C Directors will be
nominated by a unanimous vote of the existing Series C Directors designated by
these three unions.
 
    Holders of Series C Preferred Stock will not be entitled to vote such stock
for the election of any directors other than the Series C Directors. The
entitlement of the holders of Series C Preferred Stock to elect the Series C
Directors will expire on the first date on which no shares of Series C Preferred
Stock are outstanding, whether as a result of conversions, exchanges,
repurchases or redemptions.
 
    See "Corporate Governance and Control" for a description of certain veto
rights exercisable by the Series C Directors.
 
                                       19
<PAGE>
    OPTIONAL REDEMPTION
 
    The Company may redeem the Series C Preferred Stock in whole or in part at
the Put Price at any time on 60 days' prior notice. Notwithstanding the
Company's attempt to redeem the Series C Preferred Stock in whole, until August
1, 2003, each Employee Trust may retain one share of Series C Preferred Stock
for purposes of exercising the right to elect Series C Directors, as described
above.
 
    LIQUIDATION PREFERENCE
 
    The Series C Preferred Stock has a liquidation preference per share equal to
the Put Price. The Series C Preferred Stock ranks junior to the Series A
Preferred Stock and the Series B Preferred Stock and senior to the Series D
Preferred Stock both as to preference in liquidation and bankruptcy and the
receipt of dividends and repayment. The issuance by the Company of a new series
of Preferred Stock that ranks, as to both preference in liquidation and
bankruptcy and the receipt of dividends and repayment, senior to or PARI PASSU
with the Series C Preferred Stock, does not require the consent of the holders
of the Series C Preferred Stock.
 
    ACCOUNTING TREATMENT
 
    Because of applicable accounting requirements, the Company must recognize
compensation expense for each twelve-month period ending December 31 based on
the values at December 31 of the Series C Preferred Stock and the Common Stock
earned by employees during the preceding twelve-month period. Such non-cash
stock-based compensation expense is calculated each month by (1) determining the
aggregate current value of all Series C Preferred Stock and Common Stock earned
by employees since the previous January 1 using current per share values as of
the balance sheet date and then (2) subtracting the non-cash compensation
expense recognized since the prior January 1. Any increase (decrease) in share
values increases (decreases) non-cash compensation expense and the recorded
effect in any month of a change in share prices is a function of all shares
earned since the previous January 1. Such changes in share values may be
unrelated to the period's performance or cash flows.
 
    Because of the Put Right associated with the Series C Preferred Stock, such
stock is classified as a series of redeemable Preferred Stock of the Company
instead of being included in common stockholders' equity. The carrying value of
the Series C Preferred Stock will be accreted over ten years to the ultimate
redemption amount for the Series C Preferred Stock (projected to approximate
$381 million for the shares of Series C Preferred Stock that have not been
converted). These accretions during the ten-year period beginning August 1, 1993
will not be charged to net income. Instead, the amount of the accretions during
such period will be accomplished through a transfer of the periodic accretion
amount from retained earnings (I.E., accumulated deficit) to the Series C
Preferred Stock financial statement carrying value and will be deducted from net
income to arrive at net income (loss) applicable to common stockholders.
 
SERIES D PREFERRED STOCK AND RIGHTS
 
    On November 16, 1995, the Board of Directors of the Company declared a
dividend of one Preferred Share Purchase Right (a "Right") for each outstanding
share of Class A Common Stock and Class B Common Stock. The dividend was paid on
November 27, 1995 (the "Record Date") to the stockholders of record on that
date. Each Right entitles the registered holder to purchase from the Company one
one-hundredth of a share of Series D Preferred Stock at a price of $150 per one
one-hundredth of a share of Series D Preferred Stock (the "Purchase Price"),
subject to adjustment. The description and terms of the Rights are set forth in
a Rights Agreement dated as of November 16, 1995, as the same may be amended
from time to time (the "Rights Agreement"), between the Company and Norwest Bank
Minnesota, N.A., as Rights Agent (the "Rights Agent").
 
    Until the earlier to occur of (a) 10 days following a public announcement
that a person or group of affiliated or associated persons (an "Acquiring
Person") have acquired beneficial ownership of a number of
 
                                       20
<PAGE>
shares of Class A Common Stock equal to 19% or more of the sum of (i) the Common
Shares then issued and outstanding, (ii) all Common Shares issuable pursuant to
the Plan to the Employee Trusts, (iii) all Common Shares issuable upon
conversion of all the shares of Series C Preferred Stock issued or issuable to
the Employee Trusts pursuant to the Plan, (iv) all Common Shares issuable upon
the exercise of all employee stock options issued and outstanding as of the date
of this Agreement and (v) any other Common Shares not then actually issued and
outstanding but which such Person would be deemed to beneficially own hereunder
(other than the shares of Class A Common Stock issuable upon conversion of the
shares of Class B Common Stock held by such Person or the Class B Common Stock
issuable upon conversion of the Class A Common Stock held by such Person)
(together, the "outstanding Common Shares"); PROVIDED, HOWEVER, that if a Person
would be deemed an Acquiring Person upon the adoption of the Rights Agreement,
such Person will not be deemed an "Acquiring Person" for any purposes of the
Rights Agreement unless and until such Person acquires Beneficial Ownership of
any additional shares of Class A Common Stock after the date of the adoption of
the Rights Agreement unless upon the consummation of the acquisition of such
additional shares of Class A Common Stock such Person does not beneficially own
a number of shares of Class A Common Stock equal to 19% or more of the
outstanding Common Shares or (b) 10 business days (or such later date as may be
determined by action of the Board of Directors prior to such time as any person
or group of affiliated persons becomes an Acquiring Person) following the
commencement of, or announcement of an intention to make, a tender offer or
exchange offer the consummation of which would result in the beneficial
ownership by a person or group of a number of shares of Class A Common Stock
equal to 19% or more of the number of outstanding Common Shares (the earlier of
such dates being called the "Distribution Date"), the Rights will be evidenced,
with respect to any of the Common Share certificates outstanding as of the
Record Date, by such Common Share certificate.
 
    The Rights Agreement provides that, until the Distribution Date (or earlier
redemption or expiration of the Rights), the Rights will be transferred with and
only with the Common Shares; PROVIDED, HOWEVER, that prior to the Distribution
Date, upon the conversion of shares of Class B Common Stock into shares of Class
A Common Stock all Rights attached to the Class B Common Stock shall be deemed
cancelled and retired by the Company and upon the conversion of shares of Class
A Common Stock into shares of Class B Common Stock all Rights attached to the
Class A Common Stock shall be deemed cancelled and retired by the Company. Until
the Distribution Date (or earlier redemption or expiration of the Rights), new
Common Share certificates issued after the Record Date upon transfer or new
issuances of Common Shares (including pursuant to the conversion of Series C
Series D Preferred Stock) will contain a notation incorporating the Rights
Agreement by reference. Until the Distribution Date (or earlier redemption or
expiration of the Rights), the surrender for transfer of any certificates for
Common Shares outstanding as of the Record Date will also constitute the
transfer of the Rights associated with the Common Shares represented by such
certificate. As soon as practicable following the Distribution Date, separate
certificates evidencing the Rights ("Right Certificates") will be mailed to
holders of record of the Common Shares as of the close of business on the
Distribution Date and such separate Right Certificates alone will evidence the
Rights.
 
    The Rights are not exercisable until the Distribution Date. The Rights will
expire on November 16, 2005 (the "Final Expiration Date"), unless the Final
Expiration Date is extended or unless the Rights are earlier redeemed or
exchanged by the Company, in each case as described below.
 
    The Purchase Price payable, and the number of shares of Series D Preferred
Stock or other securities or property issuable, upon exercise of the Rights are
subject to adjustment from time to time to prevent dilution (i) in the event of
a stock dividend on, or a subdivision, combination or reclassification of, the
Series D Preferred Stock, (ii) upon the grant to holders of the Series D
Preferred Stock of certain rights or warrants to subscribe for or purchase
Series D Preferred Stock at a price, or securities convertible into Series D
Preferred Stock with a conversion price, less than the then-current market price
of the Series D Preferred Stock or (iii) upon the distribution to holders of the
Series D Preferred Stock of evidences of
 
                                       21
<PAGE>
indebtedness or assets (excluding regular periodic cash dividends or dividends
payable in Series D Preferred Stock) or of subscription rights or warrants
(other than those referred to above).
 
    The number of outstanding Rights are also subject to adjustment in the event
of a stock split of the Common Shares or a stock dividend on the Common Shares
payable in Common Shares or subdivisions, consolidations or combinations of the
Common Shares occurring, in any such case, prior to the Distribution Date.
 
    Shares of Series D Preferred Stock purchasable upon exercise of the Rights
will not be redeemable. Each share of Series D Preferred Stock will be entitled,
when, as and if declared, to a minimum preferential quarterly dividend payment
of $1 per share but will be entitled to an aggregate dividend of 100 times the
dividend declared per share of Common Stock. In the event of liquidation, the
holders of the Series D Preferred Stock will be entitled to a minimum
preferential liquidation payment of $100 per share (plus any accrued but unpaid
dividends) but will be entitled to an aggregate payment of 100 times the payment
made per share of Common Stock. Each share of Series D Preferred Stock will have
100 votes, voting together with the Common Stock. Finally, in the event of any
merger, consolidation or other transaction in which shares of Common Stock are
converted or exchanged, each share of Series D Preferred Stock will be entitled
to receive 100 times the amount received per share of Common Stock. These rights
are protected by customary antidilution provisions.
 
    In the event that any person or group of affiliated or associated persons
becomes an Acquiring Person, each holder of a Right, other than Rights
beneficially owned by the Acquiring Person (which will thereupon become void),
will thereafter have the right to receive upon exercise of a Right at the then
current exercise price of the Right, that number of shares of Class A Common
Stock (or one one-hundredths of a share of Series D Preferred Stock) having a
market value of two times the exercise price of the Right.
 
    In the event that, after a person or group has become an Acquiring Person,
the Company is acquired in a merger or other business combination transaction or
50% or more of its consolidated assets or earning power are sold, proper
provision will be made so that each holder of a Right (other than Rights
beneficially owned by an Acquiring Person which will have become void) will
thereafter have the right to receive, upon the exercise thereof at the then
current exercise price of the Right, that number of shares of common stock of
the person with whom the Company has engaged in the foregoing transaction (or
its parent), which number of shares at the time of such transaction will have a
market value of two times the exercise price of the Right.
 
    At any time after any person or group becomes an Acquiring Person and prior
to the acquisition by such person or group of beneficial ownership of a number
of shares of Class A Common Stock equal to 50% or more of the number of
outstanding Common Shares, the Board of Directors of the Company may exchange
the Rights (other than Rights owned by such person or group which will have
become void), in whole or in part, at an exchange ratio of one share of Class A
Common Stock, or one one-hundredth of a share of Series D Preferred Stock (or of
a share of a class or series of the Company's preferred stock having equivalent
rights, preferences and privileges), per Right (subject to adjustment).
 
    With certain exceptions, no adjustment in the Purchase Price will be
required until cumulative adjustments require an adjustment of at least 1% in
such Purchase Price. No fractional shares of Series D Preferred Stock will be
issued (other than fractions which are integral multiples of one one-hundredth
of a share of Series D Preferred Stock, which may, at the election of the
Company, be evidenced by depositary receipts) and in lieu thereof, an adjustment
in cash will be made based on the market price of the Series D Preferred Stock
on the last trading day prior to the date of exercise.
 
    At any time prior to the time an Acquiring Person becomes such, the Board of
Directors of the Company may redeem the Rights in whole, but not in part, at a
price of $.01 per Right (the "Redemption
 
                                       22
<PAGE>
Price"). Immediately upon any redemption of the Rights, the right to exercise
the Rights will terminate and the only right of the holders of Rights will be to
receive the Redemption Price.
 
    For so long as the Rights are then redeemable, the Company may, except with
respect to the redemption price, amend the Rights in any manner. After the
Rights are no longer redeemable the Company may, except with respect to the
redemption price, amend the Rights in any manner that does not adversely affect
the interests of holders of the Rights.
 
    Until a Right is exercised, the holder thereof, as such, will have no rights
as a stockholder of the Company, including, without limitation, the right to
vote or to receive dividends.
 
                        CORPORATE GOVERNANCE AND CONTROL
 
    The Company's bylaws provide that the Board of Directors will consist of 15
members, subject to the rights of certain holders of Preferred Stock to elect
additional directors to the Board of Directors under certain circumstances. The
Certificate of Designation for the Series C Preferred Stock provides that the
holders of the Series C Preferred Stock will be entitled to elect three of the
15 directors as long as any shares of Series C Preferred Stock are outstanding.
See "Description of Series A, Series B, Series C and Series D Preferred Stock
and Rights--Series C Preferred Stock--Voting Rights."
 
    Special meetings of stockholders may only be called by either the Chairman
of the Board of Directors or at the direction of a majority of the Board of
Directors. During the four-year period commencing August 1, 1993, approval of
the following matters may be disapproved if votes against such approval are cast
by directors who constitute a Blocking Coalition (as defined below): (i) the
restructuring of the Company; (ii) any annual operating and capital budget or
financing plan or any medium term business plan of the Company; (iii) any
merger, consolidation or sale of the Company, or encumbrance of a substantial
portion of its assets; (iv) any sale or relinquishment of a substantial portion
of Northwest's DOT route authority or operating rights or any route or route
authority granted pursuant to the 1952 bilateral agreement with Japan, and any
sale or transfer of any combination of two or more international routes; (v) any
sale or relinquishment of operational control over the Company or any material
portion of its assets; (vi) the payment of Common Stock dividends or any
redemption or repurchase of equity securities of the Company (except as required
by the terms of the Company's Preferred Stock or stock option plan); (vii) any
material (over $100 million) acquisitions, joint ventures or airline marketing
agreements; (viii) any sale of Common Stock (or securities convertible into
Common Stock) to any person or group of persons if after such sale such person
or group would own more than 25% of the outstanding Common Stock; (ix) any
voluntary bankruptcy filing or liquidation of the Company; or (x) the
appointment or dismissal of the president or chief executive officer of NWA
Corp., NWA Inc. or Northwest.
 
    A "Blocking Coalition" exists if at least five of the Company's directors
vote against a matter considered by the Board of Directors and the negative
votes cast against the matter satisfy the following specific requirements
specified in the succeeding sentence designed to prevent any two of the
following groups of directors from blocking any such matter that is approved by
all other directors: (1) Alfred A. Checchi, Gary L. Wilson and Frederic V.
Malek, or any person who fills a vacancy arising from the resignation, death,
removal or expiration of the term of any of Messrs. Checchi, Wilson or Malek
(the "Checchi-Wilson-Malek Directors"); (2) any person designated by KLM for
election to the Board of Directors pursuant to the Stockholders' Agreement (the
"KLM Directors"); and (3) the three Series C Directors. A Blocking Coalition
must satisfy one of the following three requirements: (a) the three
Checchi-Wilson-Malek Directors vote against the matter and the Blocking
Coalition includes at least two other directors of whom not more than one may be
a KLM Director and not more than one may be a Series C Director; (b) the three
KLM Directors vote against the matter and the Blocking Coalition includes at
least two other directors of whom not more than one may be a
Checchi-Wilson-Malek Director and not more than one may be a Series C Director;
or (c) the Series C Directors vote against the matter
 
                                       23
<PAGE>
and the Blocking Coalition includes at least two directors of whom not more than
one may be a Checchi-Wilson-Malek Director and not more than one may be a KLM
Director.
 
    After August 1, 1997 or earlier in the event that the Series C Preferred
Stock ceases to be outstanding, a vote of a simple majority of the entire Board
of Directors is required in order to approve the foregoing actions.
 
STOCKHOLDERS' AGREEMENTS
 
    The Stockholders' Agreement provides the Original Investors will vote their
shares of Common Stock and will cause their designees on the Board of Directors
to vote in favor of the election of the following designated 11 directors:
 
    (i) three designees of Alfred A. Checchi and the Checchi Family Trusts
       (collectively, the "Checchi Family") and three designees of Gary L.
       Wilson and members of his family (the "Wilson Family"), except that prior
       to August 1, 1996, the Checchi Family and the Wilson Family collectively
       were entitled to designate three, rather than six, directors to the Board
       of Directors and of the remaining three seats on the Board of Directors,
       two were to be filled by Messrs. John H. Dasburg and Thomas L. Kempner
       and one was to be filled by a person nominated by the unanimous vote of
       the Board of Directors;
 
    (ii) one designee of Blum or its affiliates;
 
    (iii) one designee of BTNY or its affiliates; and
 
    (iv) three designees of KLM or its affiliates.
 
    Seven of the 11 current members of the Board of Directors are designees
under the Stockholders' Agreement: Messrs. Checchi, Wilson and Malek were
designated jointly by the Checchi Family and the Wilson Family; Mr. Richard C.
Blum was designated by Blum; Mr. George J. Vojta was designated by BTNY; Messrs.
Kempner and Dasburg were designated pursuant to the terms of the Stockholders'
Agreement. Mr. V.A. Ravindran was nominated pursuant to the Company's bylaws.
Messrs. Tom Ducy, Marvin L. Griswold and Duane E. Woerth were designated by the
IAM, the IBT and the Northwest MEC, respectively. There are currently four
vacancies on the Board of Directors. As noted above, under the terms of the
Stockholders' Agreement, KLM is entitled to designate three individuals to serve
as directors. During 1995, Rob J.N. Abrahamsen, Pieter Bouw and Leo M. van Wijk
served as directors and were designated by KLM under the Stockholders'
Agreement. Messrs. Abrahamsen, Bouw and van Wijk resigned as directors in
February 1996. KLM has not subsequently designated any individuals to serve on
the Board of Directors. KLM has advised the Company that it will nominate three
persons not affiliated with KLM to fill the vacancies created by those
resignations. Under the Stockholders' Agreement, any future vacancies in the
Board of Directors seats currently held by Messrs. Kempner and Dasburg and the
existing vacancy in the one Board of Directors seat that cannot be designated by
KLM are to be designated by the Checchi Family and the Wilson Family.
 
    For each transfer of 2,635,019 shares of Common Stock by the Checchi Family
and the Wilson Family and their affiliates beyond the transfer of 7,905,057
shares, the number of directors that the Checchi Family and the Wilson Family
may designate on the Board of Directors will be reduced by one. The right of an
Original Investor to designate one or more directors pursuant to the
Stockholders' Agreement terminates if such party holds fewer than 2,635,019
shares of Common Stock (subject to certain exceptions based on holdings of
Series A and Series B Preferred Stock). The Stockholders' Agreement provides
that if there is a reduction in the number of directors that an Original
Investor may designate, all of the Original Investors will cause their
representatives on the Board of Directors to vote in favor of reduction in the
number of seats on the Board of Directors by the same number. In addition, if
the Company defaults in the payment of dividends or redemption payments on
either the Series A Preferred Stock or the Series B Preferred Stock, or both,
and defaults in the payment of dividends or redemption payments on the Series C
 
                                       24
<PAGE>
Preferred Stock, the Original Investors have agreed to cause the size of the
Board of Directors to be increased so that the holders of a majority of the
shares of such defaulted class of Preferred Stock may designate a new director
in accordance with the terms of the relevant Certificate of Designation.
 
    Pursuant to the Equity Letter Agreements, in September 1994, the Original
Investors entered into an agreement (the "1994 Stockholders' Agreement" and,
together with the Stockholders' Agreement, the "Stockholders' Agreements"), with
the IAM, the IBT, ALPA, the Employee Trusts and separate arrangements that are
signatories thereto and NWA Corp. under which certain rights were extended to
the holders of the stock to be issued to the Employee Trusts. The Stockholders'
Agreements provide among other things that the Original Investors may not
transfer any of their shares of Common Stock prior to June 15, 1997, subject to
certain exceptions. On January 25, 1995, the Company consummated an agreement
with BTNY to exchange 1,727 shares of the Company's Series B Preferred Stock
previously held by BTNY for 2,050,000 shares of newly issued Class B Common
Stock. In connection with the exchange of shares, amendments to the
Stockholders' Agreements were entered into which released BTNY from the
restrictions contained in each agreement on the transfer of shares of Common
Stock held by BTNY (including any shares of Class A Common Stock into which such
shares may be converted). Pursuant to the Stockholders' Agreement and certain
assignments of rights thereunder, Blum may sell up to approximately $11.4
million of Class A Common Stock without regard to the transfer restrictions
otherwise applicable.
 
    The Stockholders' Agreements were amended in 1995 to delete the provisions
relating to "tag-along" rights and rights of first refusal and reoffer and to
permit the Original Investors to vote their shares of Common Stock for the
election of directors in addition to the 11 directors designated pursuant to the
Stockholders' Agreement. The Stockholders' Agreement was also amended to delete
any special voting requirements applicable to the Original Investors in
connection with a merger or other business combination involving the Company.
 
    Pursuant to the Stockholders' Agreement, KLM has the right to purchase up to
5,270,038 shares of Common Stock from certain of the other Original Investors
(the "KLM Option"). Such right is exercisable in 1998. If KLM does not exercise
the KLM Option in full, each Original Investor has the right to cause KLM to
purchase its shares subject to the KLM Option. Such right is exercisable in
1999. In addition, the Company has agreed with KLM that KLM will be afforded an
opportunity to purchase from the Company a pro rata percentage of shares being
publicly or privately sold by the Company over a period of five years beginning
in January 1994 in order to prevent dilution in KLM's voting interest in the
Company.
 
    The terms and provisions of the Stockholders' Agreements will terminate on
the earliest of (i) the date on which shares of Common Stock sold pursuant to a
public offering, when aggregated with all other shares of Common Stock
previously sold pursuant to public offerings, equal at least 50% of the Common
Stock then outstanding on a fully diluted basis, (ii) the date on which none of
the Original Investors and their respective affiliates own at least 10% of the
original equity of the Company acquired by them in the Acquisition and (iii)
July 21, 1999. Amendments to the Stockholders' Agreements require the approvals
specified therein.
 
    A shareholders rights plan was approved at a Board of Directors meeting on
November 16, 1995 and the dividend with respect to the distribution of the
Rights occurred on November 27, 1995. See "Description of Series A, Series B,
Series C and Series D Preferred Stock and Rights--Series D Preferred Stock and
Rights." The adoption of the shareholders rights plan by the Company could
possibly affect the exercise by KLM of the KLM Option, exercisable in August
1998, to purchase up to 5,270,038 shares of Common Stock from other Original
Investors. In order to exercise the KLM Option in August 1998 should KLM's then
outstanding holdings of Common Stock plus any shares it may elect to purchase
under the KLM Option exceed the ownership threshold then in effect under the
shareholder rights plan, KLM first might have to divest itself of Common Stock
then held so as not to exceed the ownership threshold provided for in the rights
plan. KLM opposed the adoption of the shareholder rights plan and has advised
the Company that it would oppose any other action by the Company or the other
Original Investors taken
 
                                       25
<PAGE>
without KLM's consent if such action limited or otherwise adversely affected
KLM's rights under the KLM board representation agreement (described below under
"--KLM Agreement") or the Stockholders' Agreement.
 
    KLM has instituted litigation against the other Original Investors seeking a
declaratory judgment that the amendments to the Stockholders' Agreements
described above are null and void. KLM has also instituted litigation against
the Company and its directors (other than the KLM Directors) seeking to rescind
the adoption of the shareholder rights plan or, alternately, to require that the
KLM Option be exempted from the operation of the shareholder rights plan. The
Company believes that KLM's litigation against both the Original Investors and
the Company and its directors is without merit.
 
KLM AGREEMENT
 
    The Company has entered into an agreement with KLM providing that for the
15-year period following termination of the Stockholders' Agreement, KLM will be
entitled to designate a number of directors on the Company's Board of Directors
proportional to KLM's then percentage common equity interest in the Company (but
not in excess of one-third of the Board of Directors seats or such lesser amount
which is the maximum permitted under U.S. law). This agreement is terminable by
either party if KLM should terminate the Commercial Cooperation and Integration
Agreement entered into by the Company and KLM in September 1992, pursuant to
which the Company and KLM have entered into code-sharing, blocked-space
arrangements and joint commercial operations.
 
                              PLAN OF DISTRIBUTION
 
    Northwest may sell Securities to one or more underwriters for public
offering and sale by them or may sell Securities to investors or other persons
directly or through one or more dealers or agents. Any such underwriter, dealer
or agent involved in the offer and sale of the Offered Securities will be named
in an applicable Prospectus Supplement.
 
    The Offered Securities may be sold at a fixed price or prices, which may be
changed, or from time to time at market prices prevailing at the time of sale,
at prices related to such prevailing market prices or at negotiated prices.
Dealer trading may take place in certain of the Offered Securities, including
Offered Securities not listed on any securities exchange. Northwest also may,
from time to time, authorize underwriters acting as Northwest's agents to offer
and sell the Offered Securities upon the terms and conditions as shall be set
forth in any Prospectus Supplement. In connection with the sale of Offered
Securities, underwriters may be deemed to have received compensation from
Northwest in the form of underwriting discounts or commissions and may also
receive commissions from purchasers of Offered Securities for whom they may act
as agent. Underwriters may sell Offered Securities to or through dealers, and
such dealers may receive compensation in the form of discounts, concessions or
commissions from the underwriters and/or commissions (which may be changed from
time to time) from the purchasers for whom they may act as agent.
 
    If a dealer is used directly by Northwest in the sale of Offered Securities
in respect of which this Prospectus is delivered, Northwest will sell such
Offered Securities to the dealer, as principal. The dealer may then resell such
Offered Securities to the public at varying prices to be determined by such
dealer at the time of resale. Any such dealer and the terms of any such sale
will be set forth in the Prospectus Supplement relating thereto.
 
    Offered Securities may be offered and sold through agents designated by
Northwest from time to time. Any such agent involved in the offer or sale of the
Offered Securities in respect of which this Prospectus is delivered will be
named in, and any commissions payable by Northwest to such agent will be set
forth in, the applicable Prospectus Supplement. Unless otherwise indicated in
the applicable Prospectus Supplement, any such agent will be acting on a best
efforts basis for the period of its appointment.
 
                                       26
<PAGE>
    Offers to purchase Offered Securities may be solicited directly by Northwest
and sales thereof may be made by Northwest directly to institutional investors
or others who may be deemed to be underwriters within the meaning of the
Securities Act with respect to any resale thereof. The terms of any such sales
will be described in the Prospectus Supplement relating thereto. Except as set
forth in the applicable Prospectus Supplement, no director, officer or employee
of Northwest or NWA Corp. will solicit or receive a commission in connection
with direct sales by Northwest of the Offered Securities, although such persons
may respond to inquiries by potential purchasers and perform ministerial and
clerical work in connection with any such direct sales.
 
    Any underwriting compensation paid by Northwest to underwriters, dealers or
agents in connection with the offering of Offered Securities, and any discounts,
concessions or commissions allowed by underwriters to participating dealers,
will be set forth in an applicable Prospectus Supplement. Underwriters, dealers
and agents participating in the distribution of the Offered Securities may be
deemed to be underwriters, and any discounts and commissions received by them
and any profit realized by them on resale of the Offered Securities may be
deemed to be underwriting discounts and commissions under the Securities Act.
Underwriters, dealers and agents may be entitled, under agreements with
Northwest, to indemnification against and contribution toward certain civil
liabilities, including liabilities under the Securities Act, and to
reimbursement by Northwest for certain expenses.
 
    Underwriters, dealers and agents may engage in transactions with, or perform
services for, NWA Corp., Northwest and NWA Corp.'s other subsidiaries in the
ordinary course of business.
 
    If so indicated in an applicable Prospectus Supplement and subject to
existing market conditions, Northwest will authorize dealers acting as
Northwest's agents to solicit offers by certain institutions to purchase Offered
Securities from Northwest at the public offering price set forth in such
Prospectus Supplement pursuant to Delayed Delivery Contracts ("Contracts")
providing for payment and delivery on the date or dates stated in such
Prospectus Supplement. Each Contract will be for an amount not less than, and
the aggregate principal amount of Offered Securities sold pursuant to Contracts
shall not be less nor more than, the respective amounts stated in such
Prospectus Supplement. Institutions with whom Contracts, when authorized, may be
made include commercial and savings banks, insurance companies, pension funds,
investment companies, educational and charitable institutions and other
institutions, but will in all cases be subject to the approval of Northwest.
Contracts will not be subject to any conditions except the purchase by an
institution of the Offered Securities covered by its Contracts shall not at the
time of delivery be prohibited under the laws of any jurisdiction in the United
States to which such institution is subject. A commission indicated in the
applicable Prospectus Supplement will be granted to underwriters and agents
soliciting purchases of Offered Securities pursuant to Contracts accepted by
Northwest. Agents and underwriters will have no responsibility in respect of the
delivery or performance of Contracts.
 
    The Offered Securities may or may not be listed on a national securities
exchange or a foreign securities exchange. If an underwriter or underwriters are
utilized in the sale of any Offered Securities, the applicable Prospectus
Supplement will contain a statement as to the intention, if any, of such
underwriters at the date of such Prospectus Supplement to make a market in the
Offered Securities. No assurances can be given that there will be a market for
the Offered Securities.
 
    The place and time of delivery for the Offered Securities in respect of
which this Prospectus is delivered will be set forth in the applicable
Prospectus Supplement. Debt Securities issuable upon exercise of Warrants will
be issued upon payment of the exercise price and otherwise in accordance with
the relevant terms applicable to such Warrants and described in the relevant
Prospectus Supplement.
 
                                       27
<PAGE>
                                 LEGAL OPINIONS
 
    Unless otherwise indicated in the applicable Prospectus Supplement, the
validity of the Debt Securities (and the Parent Guaranty) and Warrants offered
hereby will be passed upon for Northwest and NWA Corp. by Simpson Thacher &
Bartlett (a partnership which includes professional corporations), New York, New
York.
 
                                    EXPERTS
 
    The consolidated financial statements and schedule of Northwest Airlines
Corporation appearing or incorporated by reference in Northwest Airlines
Corporation's Annual Report (Form 10-K) for the year ended December 31, 1995,
have been audited by Ernst & Young LLP, independent auditors, as set forth in
their report thereon included or incorporated by reference therein and
incorporated herein by reference. Such consolidated financial statements and
schedule are incorporated herein by reference in reliance upon such report given
upon the authority of such firm as experts in accounting and auditing.
 
                                       28
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS OR ANY RELATED PROSPECTUS
SUPPLEMENT AND/OR PRICING SUPPLEMENT IN CONNECTION WITH THE OFFER CONTAINED IN
THIS PROSPECTUS AND SUCH PROSPECTUS SUPPLEMENT AND/OR PRICING SUPPLEMENT AND, IF
GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY NORTHWEST, NWA CORP. OR ANY UNDERWRITERS, AGENTS OR
DEALERS. THIS PROSPECTUS AND ANY RELATED PROSPECTUS SUPPLEMENT AND/OR PRICING
SUPPLEMENT DO NOT CONSTITUTE AN OFFER TO SELL OR SOLICITATION OF AN OFFER TO BUY
SECURITIES IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH
OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS AND ANY RELATED
PROSPECTUS SUPPLEMENT AND/OR PRICING SUPPLEMENT NOR ANY SALE MADE HEREUNDER OR
THEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN THE AFFAIRS OF NORTHWEST OR NWA CORP. SINCE THE DATE HEREOF OR
THEREOF OR THAT THE INFORMATION CONTAINED HEREIN OR THEREIN IS CORRECT AT ANY
TIME SUBSEQUENT TO THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Available Information.....................................................    3
Incorporation of Certain Documents by Reference...........................    3
The Company...............................................................    4
Use of Proceeds...........................................................    4
Ratio of Earnings to Fixed Charges........................................    5
Description of Debt Securities............................................    5
Description of Warrants...................................................   14
Description of Capital Stock..............................................   16
Description of Series A, Series B, Series C and Series D Preferred Stock
  and Rights..............................................................   17
Corporate Governance and Control..........................................   24
Plan of Distribution......................................................   27
Legal Opinions............................................................   29
Experts...................................................................   29
</TABLE>
 
                                  $500,000,000
 
                                   NORTHWEST
                                 AIRLINES, INC.
 
                              DEBT SECURITIES AND
                              WARRANTS TO PURCHASE
                                DEBT SECURITIES
 
                                   FULLY AND
                         UNCONDITIONALLY GUARANTEED BY
 
                               NORTHWEST AIRLINES
                                  CORPORATION
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
                                          , 1996
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                  SUBJECT TO COMPLETION, DATED OCTOBER 2, 1996
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
PROSPECTUS
 
                                  $500,000,000
 
                            NORTHWEST AIRLINES, INC.
 
                           PASS THROUGH CERTIFICATES
                               ------------------
 
                         APPLICABLE UNDERLYING PAYMENTS
                    FULLY AND UNCONDITIONALLY GUARANTEED BY
                         NORTHWEST AIRLINES CORPORATION
 
    Up to $500,000,000 aggregate public offering price of Pass Through
Certificates (the "Certificates") (or its equivalent (based on the applicable
exchange rate at the time of sale) in one or more foreign currencies or currency
units) may be offered for sale from time to time pursuant to this Prospectus and
related Prospectus Supplements (as defined below). Certificates may be issued in
one or more series in amounts, at prices and on terms to be determined at the
time of the offering. In respect of each offering of Certificates, a separate
Northwest Airlines Pass Through Trust for each series of Certificates being
offered (each, a "Trust") will be formed pursuant to one or more Pass Through
Trust Agreements (each, a "Basic Agreement") and one or more supplements thereto
(each, a "Trust Supplement") relating to such Trust to be entered into among
Northwest Airlines, Inc. ("Northwest"), Northwest Airlines Corporation ("NWA
Corp." and, together with its subsidiaries, the "Company") and the trustee named
therein (the "Trustee"), as trustee under each Trust. Each Certificate in a
series will represent a fractional undivided interest in the related Trust and
will have no rights, benefits or interests in respect of any other Trust. The
property of the Trusts will consist of equipment notes issued (a) on a
nonrecourse basis by one or more owner trustees pursuant to separate leveraged
lease transactions (the "Leased Aircraft Notes") to finance or refinance a
portion of the equipment cost of aircraft, including engines (each, a "Leased
Aircraft" and, collectively, the "Leased Aircraft"), which have been or will be
leased to Northwest pursuant to a separate lease agreement (each such lease
agreement, a "Lease") for each Leased Aircraft, or (b) with recourse to
Northwest (the "Owned Aircraft Notes" and, together with any Leased Aircraft
Notes, the "Equipment Notes") to finance all or a portion of the equipment cost
of, or to purchase all or a portion of the outstanding debt with respect to,
aircraft, including engines (each, an "Owned Aircraft" and, collectively, the
"Owned Aircraft"; together with Leased Aircraft, the "Aircraft"), which have
been or will be purchased and owned by Northwest. NWA Corp. will fully and
unconditionally guarantee (the "Parent Guaranty") to the holders from time to
time of Certificates (i) with respect to related Owned Aircraft Notes, the full
and prompt payment of principal, premium, if any, and interest thereon when and
as the same shall become due and payable, whether at maturity, upon redemption
or otherwise and (ii) with respect to related Leased Aircraft Notes, the full
and prompt payment of all amounts payable by Northwest under the related Lease
when and as the same shall become due and payable.
 
    The specific terms of the particular Certificates in respect of which this
Prospectus is being delivered will be set forth in a supplement to this
Prospectus (the "Prospectus Supplement") which will be delivered together with
this Prospectus, including, where applicable, the specific designation, form,
aggregate principal amount, initial public offering price and distribution dates
relating to such Certificates, the currency in which such Certificates will be
payable, the Trust or Trusts relating to such Certificates, the Equipment Notes
to be purchased by such Trust or Trusts, the Aircraft relating to such Equipment
Notes, the leveraged lease transactions or financing arrangements, as the case
may be, relating to such Equipment Notes and other special terms relating to
such Certificates and the net proceeds from the offering of such Certificates.
The Certificates shall be issued in registered form only and may, if so
specified in the applicable Prospectus Supplement, be issued in accordance with
a book-entry system.
 
    With respect to one or more Aircraft, Equipment Notes may be issued, each of
which may have a different interest rate, final maturity date and ranking in
respect of priority of payment. For each series of Certificates, the Trustee
will purchase one or more Equipment Notes issued with respect to one or more
Aircraft such that all of the Equipment Notes held in the related Trust will
have identical ranking and identical interest rates (in each case equal to the
rate applicable to the Certificates issued by such Trust), and such that the
latest maturity date for such Equipment Notes will occur on or before the final
distribution date for such Certificates. Interest paid on the Equipment Notes
held in each Trust will be passed through to the holders of the Certificates
relating to such Trust on the dates and at the rate per annum set forth in the
Prospectus Supplement relating to such Certificates until the final distribution
date for such Trust. Principal paid on the Equipment Notes held in each Trust
will be passed through to the holders of the Certificates relating to such Trust
in scheduled amounts on the dates set forth in the Prospectus Supplement
relating to such Certificates until the final distribution date for such Trust.
The Equipment Notes issued with respect to any Aircraft will be secured by a
security interest in such Aircraft and, in the case of the Leased Aircraft, by a
security interest in the Lease relating thereto, including the right to receive
rentals payable in respect of such Leased Aircraft by Northwest. Although
neither the Certificates nor the Leased Aircraft Notes will be direct
obligations of, or guaranteed by, Northwest, the amounts unconditionally payable
by Northwest for lease of Leased Aircraft will be sufficient to pay in full when
due all payments required to be made on the corresponding Leased Aircraft Notes.
 
    The Certificates may be sold to or through underwriters, through dealers or
agents or directly to purchasers. See "Plan of Distribution." The Prospectus
Supplement will set forth the names of any underwriters, dealers or agents
involved in the sale of the Certificates in respect of which this Prospectus is
being delivered, the proposed amounts, if any, to be purchased by underwriters
and the compensation, if any, of such underwriters or agents. See "Plan of
Distribution" for information concerning secondary trading of the Certificates.
 
    THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE SALES OF CERTIFICATES UNLESS
ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.
                         ------------------------------
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
     EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
            REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
               The date of this Prospectus is             , 1996.
<PAGE>
                             AVAILABLE INFORMATION
 
    NWA Corp. and Northwest together have filed with the Securities and Exchange
Commission (the "Commission") a Registration Statement on Form S-3 (together
with all amendments and exhibits, the "Registration Statement") under the
Securities Act of 1933, as amended (the "Securities Act"), with respect to the
Certificates offered hereby. This Prospectus does not contain all of the
information set forth in the Registration Statement, certain parts of which are
omitted in accordance with the rules and regulations of the Commission, and to
which reference is hereby made. Statements made in this Prospectus as to the
contents of any contract, agreement or other document referred to are not
necessarily complete. With respect to each such contract, agreement or other
document filed as an exhibit to the Registration Statement, reference is made to
the exhibit for a more complete description of the matter involved.
 
    NWA Corp. is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files periodic reports and other information with the Commission. Such
reports and other information, as well as the Registration Statement, including
exhibits and schedules filed therewith, may be inspected at the public reference
facilities maintained by the Commission at 450 Fifth Street, N.W., Washington,
D.C. 20549, Room 1024, and at the regional offices of the Commission located at
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661
and at 7 World Trade Center, 13th Floor, New York, New York 10048. Copies of
such materials may be obtained from the Public Reference Section of the
Commission, 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed rates.
The Commission maintains a Web site (http:www.sec.gov) that contains reports,
proxy and information statements and other information regarding registrants
that file electronically with the Commission. Northwest is not required to file
separate reports, proxy statements or other information with the Commission
pursuant to the requirements of the Exchange Act. Instead, information with
respect to Northwest is provided, to the extent required, in filings made by NWA
Corp.
 
    Separate financial statements of Northwest are not being provided because
all of the Certificates being issued by Northwest under this Prospectus will be
supported by full and unconditional guarantees by NWA Corp. and, therefore, such
financial statements are not deemed material.
 
    UNLESS OTHERWISE STATED HEREIN, INFORMATION CONTAINED HEREIN CONCERNING THE
AGGREGATE NUMBER OF SHARES AND RESPECTIVE PERCENTAGES OF NWA CORP. STOCK HELD BY
INVESTORS IS BASED ON THE FOLLOWING ASSUMPTIONS: (I) THE ISSUANCE OF ALL CLASS A
COMMON STOCK, PAR VALUE $.01 PER SHARE, OF NWA CORP. (THE "CLASS A COMMON
STOCK"), AND CLASS B COMMON STOCK, PAR VALUE $.01 PER SHARE, OF NWA CORP. (THE
"CLASS B COMMON STOCK" AND, TOGETHER WITH THE CLASS A COMMON STOCK, THE "COMMON
STOCK") AND SERIES C PREFERRED STOCK TO BE ISSUED TO THE EMPLOYEE TRUSTS (AS
DEFINED HEREIN) PURSUANT TO THE EQUITY LETTER AGREEMENTS (AS DEFINED HEREIN) AND
THE CONVERSION OF THE SERIES C PREFERRED STOCK INTO COMMON STOCK AND (II) THE
EXERCISE OF ALL STOCK OPTIONS HELD BY EXECUTIVE OFFICERS THAT ARE EXERCISABLE
WITHIN 60 DAYS OF JULY 31, 1996.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following document of NWA Corp., which has been filed with the
Commission, is hereby incorporated by reference in this Prospectus:
 
    (a) NWA Corp.'s Annual Report on Form 10-K for the fiscal year ended
       December 31, 1995; and
 
    (b) NWA Corp.'s Quarterly Reports on Form 10-Q for the quarters ended March
       31, 1996 and June 30, 1996.
 
    All documents filed by NWA Corp. pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering of the Certificates offered hereby shall be
deemed to be incorporated by reference into this Prospectus and to be a part
hereof from the respective dates of filing of such documents. Any statement
contained in a document incorporated or deemed to be incorporated by reference
herein shall be deemed to be modified or superseded for purposes of this
Prospectus to the extent that a statement contained herein or in any other
subsequently filed document which also is or is deemed to be incorporated by
reference herein modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus. The Exchange Act file number is
0-23642.
 
    NWA Corp. will provide without charge to any person to whom a copy of this
Prospectus has been delivered, upon written or oral request, a copy of any or
all of the foregoing documents incorporated herein by reference (other than
exhibits to such documents unless such exhibits are specifically incorporated by
reference into such documents). Requests should be directed to the Secretary's
Office, NWA Corp., 5101 Northwest Drive, Dept. A1180, St. Paul, Minnesota
55111-3034, telephone number (612) 726-2111.
 
                                       2
<PAGE>
                                  THE COMPANY
 
    NWA Corp. was incorporated in February 1989 under the laws of the State of
Delaware. Northwest, the principal wholly-owned indirect subsidiary of NWA
Corp., operates the world's fourth largest airline (as measured by 1995 revenue
passenger miles ("RPMs")) and is engaged principally in commercial
transportation of passengers and cargo. Northwest's business focuses on the
development of a global airline network through the optimization of Northwest's
strategic assets, which include domestic hubs at Detroit and Minneapolis/St.
Paul, an extensive Pacific route system with a hub at Tokyo, and a transatlantic
alliance with KLM Royal Dutch Airlines ("KLM").
 
    Northwest operates substantial domestic and international route networks and
as of June 30, 1996 directly serves more than 150 cities in 18 countries on the
continents of North America, Asia and Europe. Northwest had more than 49 million
enplanements and flew over 62 billion RPMs in 1995.
 
    NWA Inc., the parent company of Northwest, was acquired in 1989 (the
"Acquisition") by NWA Corp., a Delaware corporation formed by Alfred A. Checchi,
Gary L. Wilson, Frederic V. Malek, Fosters Brewing Group Ltd. of Australia
("Fosters"), Bankers Trust New York Corporation, KLM and Richard C. Blum &
Associates--NWA Partners, L.P. ("Blum") (together (other than Fosters, which has
sold its interest in NWA Corp. to KLM), the "Original Investors") for the
purpose of the Acquisition. As of July 31, 1996, the Original Investors
beneficially owned approximately 46.9% of the common equity representing
approximately 46.2% of the voting equity of NWA Corp. In addition, pursuant to
certain agreements (the "Equity Letter Agreements") entered into by the Company
with several unions representing the Company's employees, NWA Corp. will have
issued to trusts (the "Employee Trusts") for the benefit of Company employees
shares of Series C Preferred Stock and Common Stock which represent
approximately 22.7% of the voting equity of the Company as of July 31, 1996. The
holders of Series C Preferred Stock have the right to elect three of the
Company's directors (the "Series C Directors"). The Original Investors are
parties to an Investor Stockholders' Agreement (the "Stockholders' Agreement")
which governs their votes for the election of 11 of the Company's directors. The
Stockholders' Agreement expires in July 1999, subject to earlier termination in
certain circumstances.
 
                            ------------------------
 
    NWA Corp. was originally formed under the name Wings Holdings Inc. The
Company's principal executive offices are located at 2700 Lone Oak Parkway,
Eagan, Minnesota 55121; its mailing address is 5101 Northwest Drive, St. Paul,
Minnesota 55111-3034 and its telephone number is (612) 726-2111.
 
                       GENERAL OUTLINE OF TRUST STRUCTURE
 
    In respect of each offering of Certificates, one or more Trusts will be
formed, and the related Certificates issued, pursuant to separate Trust
Supplements to be entered into among the Trustee, NWA Corp. and Northwest in
accordance with the terms of the Basic Agreement. Concurrently with the
execution and delivery of each Trust Supplement, the Trustee, on behalf of the
Trust formed thereby, will enter into one or more purchase or refunding
agreements (each such agreement being herein referred to as a "Note Purchase
Agreement") pursuant to which it will purchase one or more Equipment Notes
relating to one or more of the Aircraft described in the applicable Prospectus
Supplement. Pursuant to the applicable Note Purchase Agreement or Note Purchase
Agreements, the Trustee, on behalf of each Trust, will purchase one or more
Equipment Notes such that the Equipment Notes that constitute the property of
such Trust will have identical interest rates (in each case equal to the rate
applicable to the Certificates issued by such Trust) and identical priority of
payment relative to each of the other Equipment Notes issued under the Related
Indentures (as defined below). The maturity dates of the Equipment Notes
acquired by each Trust will occur on or before the final distribution date
applicable to the Certificates that will be issued by such Trust. The Trustee
will distribute the amount of payments of principal, premium, if any, and
interest received by it as holder of the Equipment Notes to the Certificate
holders of the Trust in which such Equipment Notes are held. See "Description of
the Certificates" and "Description of the Equipment Notes."
 
                                       3
<PAGE>
                                USE OF PROCEEDS
 
    Except as set forth in a Prospectus Supplement for a specific offering of
Certificates, the Certificates will be issued in order to facilitate (a) the
financing or refinancing of the debt portion and, in certain cases, the
refinancing of some of the equity portion of one or more separate leveraged
lease transactions entered into by Northwest, as lessee, with respect to the
Leased Aircraft as described in the applicable Prospectus Supplement, and (b)
the financing or refinancing of the aggregate principal amount of debt to be
issued, or the purchase of the aggregate principal amount of the debt previously
issued, by Northwest in respect of the Owned Aircraft as described in the
applicable Prospectus Supplement. The proceeds from the sale of Certificates in
respect of such Owned or Leased Aircraft is not expected to exceed 80% of the
appraised value of such Owned or Leased Aircraft at the time of financing or
refinancing. Except as set forth in a Prospectus Supplement for a specific
offering of Certificates, the proceeds from the sale of the Certificates will be
used by the Trustee on behalf of the applicable Trust or Trusts to purchase
either (a) Leased Aircraft Notes issued by the respective Owner Trustee or Owner
Trustees to finance or refinance (as specified in the applicable Prospectus
Supplement) the related Leased Aircraft, or (b) Owned Aircraft Notes issued by
Northwest to finance or refinance (as specified in the applicable Prospectus
Supplement) the related Owned Aircraft. Any portion of the proceeds from the
sale of Certificates not used by the Trustee to purchase Equipment Notes on or
prior to the date specified therefor in the applicable Prospectus Supplement
will be distributed on a Special Distribution Date (as defined below) to the
applicable Certificate holders, together with interest, but without premium. See
"Description of Certificates--Special Distribution Upon Unavailability of
Aircraft."
 
    The Leased Aircraft Notes will be issued under separate trust indentures
(the "Leased Aircraft Indentures") between a bank, trust company or other
institution specified in the related Prospectus Supplement, as trustee
thereunder (in such capacity, herein referred to as the "Loan Trustee"), and an
institution specified in the related Prospectus Supplement acting, not in its
individual capacity, but solely as owner trustee (an "Owner Trustee") of a
separate trust for the benefit of one or more institutional investors (each, an
"Owner Participant"). With respect to each Leased Aircraft, the related Owner
Participant will have provided or will provide from sources other than the
Leased Aircraft Notes a portion of the equipment cost of the related Leased
Aircraft. No Owner Participant, however, will be personally liable for any
amount payable under the related Leased Aircraft Indenture or the Leased
Aircraft Notes issued thereunder. Simultaneously with the acquisition of each
Leased Aircraft, the related Owner Trustee leased or will lease such Aircraft to
Northwest pursuant to a separate Lease. The Owned Aircraft Notes will be issued
under separate trust indentures (the "Owned Aircraft Indentures" and, together
with any Leased Aircraft Indentures, the "Indentures") between the applicable
Loan Trustee and Northwest.
 
                                       4
<PAGE>
                       RATIO OF EARNINGS TO FIXED CHARGES
 
    The following table sets forth the ratio of earnings to fixed charges for
NWA Corp. and its consolidated subsidiaries for the periods indicated. The ratio
of earnings to fixed charges represents the number of times that fixed charges
were covered by earnings. In computing the ratio, earnings represent
consolidated earnings (loss) before income taxes, cumulative effect of
accounting change and fixed charges (excluding capitalized interest). Fixed
charges consist of interest expense (including capitalized interest), one-third
of rental expense, which is considered representative of the interest factor,
and amortization of debt discount and expense.
 
<TABLE>
<CAPTION>
               YEAR ENDED DECEMBER 31,
- -----------------------------------------------------
  1995       1994       1993       1992       1991
- ---------  ---------  ---------  ---------  ---------
<S>        <C>        <C>        <C>        <C>
     1.91       1.88     (a)        (a)        (a)
</TABLE>
 
- ------------------------
 
(a) Earnings did not cover fixed charges by $121.5 million for the year ended
    December 31, 1993, $1,513.5 million for the year ended December 31, 1992 and
    $522.1 million for the year ended December 31, 1991. Excluding non-recurring
    special charges of $94.3 million for the year ended December 31, 1993, and
    $792.7 million for the year ended December 31, 1992, earnings did not cover
    fixed charges by $27.2 million and $720.8 million for the two periods,
    respectively.
 
                        DESCRIPTION OF THE CERTIFICATES
 
    In connection with each offering of Certificates, one or more separate
Trusts will be formed and one or more series of Certificates will be issued
pursuant to the Basic Agreement and one or more separate Trust Supplements to be
entered into among Northwest, NWA Corp. and the Trustee. The statements made
under this caption are summaries and reference is made to the detailed
provisions of the Basic Agreement, the form of which has been filed as an
exhibit to the Registration Statement of which this Prospectus is a part. The
summaries relate to the Basic Agreement and each of the Trust Supplements, the
Trusts to be formed thereby and the Certificates to be issued by each Trust
except to the extent, if any, described in the applicable Prospectus Supplement.
The Prospectus Supplement that accompanies this Prospectus contains a glossary
of the material terms used with respect to the specific series of Certificates
being offered thereby. The Trust Supplement relating to each series of
Certificates and the forms of the related Note Purchase Agreement, Indenture,
Lease, Trust Agreement, Participation Agreement, Refunding Agreement,
Intercreditor Agreement and Revolving Credit Agreement, as applicable, will be
filed as exhibits to a post-effective amendment to the Registration Statement of
which this Prospectus is a part, a Current Report on Form 8-K, a Quarterly
Report on Form 10-Q or an Annual Report on Form 10-K, as applicable, filed by
NWA Corp. with the Commission.
 
    The Certificates offered pursuant to this Prospectus will be limited to
$500,000,000 aggregate public offering price (or its equivalent (based on the
applicable exchange rate at the time of sale) in one or more foreign currencies
or currency units).
 
    Certain provisions of the description of the Certificates in this Prospectus
do not necessarily apply to one Certificate of each Trust which may be issued in
a denomination of less than $1,000.
 
    TO THE EXTENT THAT ANY PROVISION IN ANY PROSPECTUS SUPPLEMENT IS
INCONSISTENT WITH ANY PROVISION IN THIS SUMMARY, THE PROVISION OF SUCH
PROSPECTUS SUPPLEMENT WILL CONTROL.
 
GENERAL
 
    Each Certificate will represent a fractional undivided interest in the Trust
created by the Trust Supplement pursuant to which such Certificate was issued
and all payments and distributions shall be made only from the related Trust
Property (as defined below). The property of each Trust (the "Trust Property")
will include the Equipment Notes held in such Trust, all monies at any time paid
thereon and all
 
                                       5
<PAGE>
monies due and to become due thereunder and funds from time to time deposited
with the Trustee in accounts relating to such Trust and, if so specified in the
Prospectus Supplement related to a series of Certificates, rights under
intercreditor agreements relating to cross-subordination arrangements and monies
receivable under a liquidity facility. Each Certificate will represent a pro
rata share of the outstanding principal amount of the Equipment Notes held in
the related Trust and, unless otherwise specified in the applicable Prospectus
Supplement, will be issued in minimum denominations of $1,000 or any integral
multiple thereof. The Certificates do not represent an interest in or obligation
of Northwest, NWA Corp., the Trustee, any of the Loan Trustees or Owner Trustees
in their individual capacities, any Owner Participant, or any affiliate of any
thereof. Each Certificate holder by its acceptance of a Certificate agrees to
look solely to the income and proceeds from the Trust Property as provided in
the Basic Agreement and the applicable Trust Supplement.
 
    The Equipment Notes issued under an Indenture may be held in more than one
Trust and one Trust may hold Equipment Notes issued under more than one
Indenture (each Indenture the Equipment Notes of which are held in a Trust, a
"Related Indenture"). Unless otherwise provided in a Prospectus Supplement, only
Equipment Notes having the same priority of payment (the Equipment Notes of any
such priority, a "Class") may be held in the same Trust.
 
    Interest will be passed through to Certificate holders of each Trust at the
rate per annum payable on the Equipment Notes held in such Trust, as set forth
for such Trust on the cover page of the applicable Prospectus Supplement.
 
    Reference is made to the Prospectus Supplement that accompanies this
Prospectus for a description of the specific series of Certificates being
offered thereby, including: (1) the specific designation and title of such
Certificates; (2) the Regular Distribution Dates (as defined below) and Special
Distribution Dates (as defined below) applicable to such Certificates; (3) the
currency or currencies (including currency units) in which such Certificates may
be denominated; (4) the specific form of such Certificates, including whether or
not such Certificates are to be issued in accordance with a book-entry system;
(5) a description of the Equipment Notes to be purchased by such Trust,
including (a) the period or periods within which, the price or prices at which,
and the terms and conditions upon which such Equipment Notes may or must be
redeemed or defeased in whole or in part, by Northwest or, with respect to
Leased Aircraft Notes, the Owner Trustee, (b) the payment priority of such
Equipment Notes in relation to any other Equipment Notes issued with respect to
the related Aircraft, (c) any additional security or liquidity enhancements
therefor and (d) any intercreditor or other rights or limitations between or
among the holders of Equipment Notes of different priorities issued by the same
Owner Trustee; (6) a description of the related Aircraft, including whether such
Aircraft is a Leased Aircraft or an Owned Aircraft; (7) a description of the
related Note Purchase Agreement and Related Indentures, including a description
of the events of default under the Related Indentures, the remedies exercisable
upon the occurrence of such events of default and any limitations on the
exercise of such remedies with respect to such Equipment Notes; (8) if such
Certificates relate to Leased Aircraft, a description of the related Lease,
Trust Agreement and Participation Agreement, including (a) the names of the
related Owner Trustees, (b) a description of the events of default under the
related Leases, the remedies exercisable upon the occurrence of such events of
default and any limitations on the exercise of such remedies with respect to
such Leased Aircraft Notes, and (c) the rights of the related Owner Trustee, if
any, and/or Owner Participant, if any, to cure failures of Northwest to pay rent
under the related Lease; (9) the extent, if any, to which the provisions of the
operative documents applicable to such Equipment Notes may be amended by the
parties thereto without the consent of the holders of, or only upon the consent
of the holders of a specified percentage of aggregate principal amount of, such
Equipment Notes; (10) cross-default or cross-collateralization provisions in the
Related Indentures; (11) subordination provisions among the holders of
Certificates, including any cross-subordination provisions among the holders of
Certificates in separate Trusts; and (12) any other special terms pertaining to
such Certificates.
 
                                       6
<PAGE>
    If any Certificates are denominated in one or more foreign currencies or
currency units, the restrictions, certain United States federal income tax
considerations, specific terms and other information with respect to such
Certificates and such foreign currency or currency units will be set forth in
the applicable Prospectus Supplement.
 
BOOK-ENTRY REGISTRATION
 
    GENERAL
 
    If specified in the applicable Prospectus Supplement, the Certificates will
be subject to the provisions described below and under the caption "--Definitive
Certificates." Upon issuance, each series of Certificates will be represented by
one fully registered global certificate. Each global certificate will be
deposited with, or on behalf of, The Depository Trust Company ("DTC") and
registered in the name of Cede & Co. ("Cede"), or its nominee. No person
acquiring an interest in such Certificates ("Certificate Owner") will be
entitled to receive a certificate representing such person's interest in such
Certificates, except as set forth below under "--Definitive Certificates."
Unless and until Definitive Certificates are issued under the limited
circumstances described herein, all references to actions by Certificate holders
shall refer to actions taken by DTC upon instructions from DTC Participants (as
defined below), and all references herein to distributions, notices, reports and
statements to Certificate holders shall refer, as the case may be, to
distributions, notices, reports and statements to DTC or Cede, as the registered
holder of such Certificates, or to DTC Participants for distribution to
Certificate Owners in accordance with DTC procedures.
 
    Northwest has been advised that DTC is a limited purpose trust company
organized under the laws of the State of New York, a member of the Federal
Reserve System, a "clearing corporation" within the meaning of the New York
Uniform Commercial Code and "clearing agency" registered pursuant to section 17A
of the Exchange Act. DTC was created to hold securities for its participants
("DTC Participants") and to facilitate the clearance and settlement of
securities transactions between DTC Participants through electronic
book-entries, thereby eliminating the need for physical transfer of
certificates. DTC Participants include securities brokers and dealers, banks,
trust companies and clearing corporations. Indirect access to the DTC system
also is available to others such as banks, brokers, dealers and trust companies
that clear through or maintain a custodial relationship with a DTC Participant
either directly or indirectly ("Indirect Participants").
 
    Certificate Owners that are not DTC Participants or Indirect Participants
but desire to purchase, sell or otherwise transfer ownership of, or other
interests in, the Certificates may do so only through DTC Participants and
Indirect Participants. In addition, Certificate Owners will receive all
distributions of principal and interest from the Trustee through DTC
Participants or Indirect Participants, as the case may be. Under a book-entry
format, Certificate Owners may experience some delay in their receipt of
payments, because such payments will be forwarded by the Trustee to Cede, as
nominee for DTC. DTC will forward such payments in same-day funds to DTC
Participants who are credited with ownership of the Certificates in amounts
proportionate to the principal amount of each such DTC Participant's respective
holdings of beneficial interests in the Certificates. DTC Participants will
thereafter forward payments to Indirect Participants or Certificate Owners, as
the case may be, in accordance with customary industry practices. The forwarding
of such distributions to the Certificate Owners will be the responsibility of
such DTC Participants. Unless and until the Definitive Certificates are issued
under the limited circumstances described herein, the only "Certificate holder"
will be Cede, as nominee of DTC. Certificate Owners will not be recognized by
the Trustee as Certificate holders, as such term is used in the Basic Agreement,
and Certificate Owners will be permitted to exercise the rights of Certificate
holders only indirectly through DTC and DTC Participants.
 
    Under the rules, regulations and procedures creating and affecting DTC and
its operations (the "Rules"), DTC is required to make book-entry transfers of
the Certificates among DTC Participants on whose behalf it acts with respect to
the Certificates and to receive and transmit distributions of principal,
 
                                       7
<PAGE>
premium, if any, and interest with respect to the Certificates. DTC Participants
and Indirect Participants with which Certificate Owners have accounts with
respect to the Certificates similarly are required to make book-entry transfers
and receive and transmit such payments on behalf of their respective customers.
Accordingly, although Certificate Owners will not possess the Certificates, the
Rules provide a mechanism by which Certificate Owners will receive payments and
will be able to transfer their interests.
 
    Because DTC can only act on behalf of DTC Participants, who in turn act on
behalf of Indirect Participants, the ability of a Certificate Owner to pledge
the Certificates to persons or entities that do not participate in the DTC
system, or to otherwise act with respect to such Certificates, may be limited
due to the lack of a physical certificate for such Certificates.
 
    DTC has advised Northwest that it will take any action permitted to be taken
by a Certificate holder under the Basic Agreement only at the direction of one
or more DTC Participants to whose accounts with DTC the Certificates are
credited. Additionally, DTC has advised Northwest that in the event any action
requires approval by Certificate holders of a certain percentage of beneficial
interest in each Trust, DTC will take such action only at the direction of and
on behalf of DTC Participants whose holders include undivided interests that
satisfy any such percentage. DTC may take conflicting actions with respect to
other undivided interests to the extent that such actions are taken on behalf of
DTC Participants whose holders include such undivided interests.
 
    Neither Northwest, NWA Corp. nor the Trustee will have any liability for any
aspect of the records relating to or payments made on account of beneficial
ownership interests in the Certificates held by Cede, as nominee for DTC, or for
maintaining, supervising or reviewing any records relating to such beneficial
ownership interests.
 
    The applicable Prospectus Supplement will specify any additional book-entry
registration procedures applicable to Certificates denominated in a currency
other than United States dollars.
 
    SAME-DAY SETTLEMENT AND PAYMENT
 
    So long as the Certificates are registered in the name of Cede, as nominee
for DTC, all payments made by Northwest to the Loan Trustee under any Lease or
any Owned Aircraft Indentures will be in immediately available funds. Such
payments, including the final distribution of principal with respect to the
Certificates of any Trust, will be passed through to DTC in immediately
available funds.
 
    Secondary trading in long-term notes and debentures of corporate issuers is
generally settled in clearinghouse or next-day funds. In contrast, secondary
trading in pass through certificates is generally settled in immediately
available or same-day funds. Any Certificates registered in the name of Cede, as
nominee for DTC, will trade in DTC's Same-Day Funds Settlement System until
maturity, and secondary market trading activity in the Certificates will
therefore be required by DTC to settle in immediately available funds. No
assurance can be given as to the effect, if any, of settlement in same-day funds
on trading activity in the Certificates.
 
    DEFINITIVE CERTIFICATES
 
    Certificates will be issued in certificated form ("Definitive Certificates")
to Certificate Owners or their nominees, rather than to DTC or its nominee, only
if (i) Northwest advises the Trustee in writing that DTC is no longer willing or
able to discharge properly its responsibilities as depository with respect to
such Certificates and Northwest is unable to locate a qualified successor, (ii)
Northwest, at its option, elects to terminate the book-entry system through DTC
or (iii) after the occurrence of certain events of default or other events
specified in the related Prospectus Supplement. Certificate Owners with
fractional undivided interests aggregating not less than a majority in interest
in such Trust advise the Trustee, Northwest and DTC through DTC Participants in
writing that the continuation of a book-entry system through DTC (or a successor
thereto) is no longer in the Certificate Owners' best interest.
 
                                       8
<PAGE>
    Upon the occurrence of any event described in the immediately preceding
paragraph, the Trustee will be required to notify all Certificate Owners through
DTC Participants of the availability of Definitive Certificates. Upon surrender
by DTC of the certificates representing the Certificates and receipt of
instructions for re-registration, the Trustee will reissue the Certificates as
Definitive Certificates to Certificate Owners.
 
    Distributions of principal, premium, if any, and interest with respect to
Certificates will thereafter be made by the Trustee directly in accordance with
the procedures set forth in the Basic Agreement and the applicable Trust
Supplements, to holders in whose names the Definitive Certificates were
registered at the close of business on the applicable record date. Such
distributions will be made by check mailed to the address of such holder as it
appears on the register maintained by the Trustee. The final payment on any
Certificate, however, will be made only upon presentation and surrender of such
Certificate at the office or agency specified in the notice of final
distribution to Certificate holders.
 
    Definitive Certificates will be freely transferable and exchangeable at the
office of the Trustee upon compliance with the requirements set forth in the
Basic Agreement and the applicable Trust Supplements. No service charge will be
imposed for any registration of transfer or exchange, but payment of a sum
sufficient to cover any tax or other governmental charge shall be required.
 
PAYMENTS AND DISTRIBUTIONS
 
    Subject to the effect of any cross-subordination provisions set forth in the
Prospectus Supplement for a series of Certificates, payments of principal,
premium, if any, and interest with respect to the Equipment Notes held in each
Trust will be distributed by the Trustee, upon receipt, to Certificate holders
of such Trust on the dates and in the currency specified in the applicable
Prospectus Supplement, except in certain cases when some or all of such
Equipment Notes are in default as described in the applicable Prospectus
Supplement. Payments of principal of, and interest on, the unpaid principal
amount of the Equipment Notes held in each Trust will be scheduled to be
received by the Trustee on the dates specified in the applicable Prospectus
Supplement (such scheduled payments of interest and principal on the Equipment
Notes to the Trustee are herein referred to as "Scheduled Payments," and the
dates specified in the applicable Prospectus Supplement for distribution of
Scheduled Payments to the Trustee are herein referred to as "Regular
Distribution Dates"). See "Description of the Equipment Notes--General." Subject
to the effect of any cross-subordination provisions set forth in the Prospectus
Supplement for a series of Certificates, each Certificate holder of each Trust
will be entitled to receive a pro rata share of any distribution in respect of
Scheduled Payments of principal and interest made on the Equipment Notes held in
the Trust.
 
    Payments of principal, premium, if any, and interest received by the Trustee
on account of the early redemption, if any, of the Equipment Notes relating to
one or more Aircraft held in a Trust, and payments, other than Scheduled
Payments received on a Regular Distribution Date, received by the Trustee
following default in respect of Equipment Notes held in a Trust relating to one
or more Aircraft ("Special Payments") will be distributed on the date determined
pursuant to the applicable Prospectus Supplement (a "Special Distribution Date")
except that, unless otherwise specified in the applicable Prospectus Supplement,
payments received by the Trustee following default in respect of the Equipment
Notes on a Regular Distribution Date as a result of a drawing under any
liquidity facility specified in the applicable Prospectus Supplement (each, a
"Liquidity Facility"), provided for the benefit of the Certificate holders shall
be distributed on such Regular Distribution Date. The Trustee will mail notice
to the Certificate holders of record of the applicable Trust not less than 20
days prior to the Special Distribution Date on which any Special Payment is
scheduled to be distributed by the Trustee stating such anticipated Special
Distribution Date.
 
                                       9
<PAGE>
POOL FACTORS
 
    Unless there has been an early redemption, a purchase of an issue of
Equipment Notes by the related Owner Trustee after an Indenture Default (as
defined below), a default in the payment of principal in respect of one or more
issues of the Equipment Notes held in a Trust or certain actions have been taken
following a default thereon, as described in the applicable Prospectus
Supplement, the Pool Factor (as defined below) for the Trusts will decline in
proportion to the scheduled repayments of principal on the Equipment Notes held
in such Trust as described in the applicable Prospectus Supplement. In the event
of such redemption, purchase or default, the Pool Factor and the Pool Balance
(as defined below) of each Trust so affected will be recomputed after giving
effect thereto and notice thereof will be mailed to the Certificate holders of
such Trust. Each Trust will have a separate Pool Factor.
 
    Unless otherwise described in the applicable Prospectus Supplement, the
"Pool Balance" for each Trust or for the Certificates issued by any Trust
indicates, as of any date, the original aggregate face amount of the
Certificates of such Trust less the aggregate amount of all payments made in
respect of the Certificates of such Trust other than payments made in respect of
interest or premium thereon or reimbursement of any costs and expenses in
connection therewith. The Pool Balance for each Trust as of any Regular
Distribution Date or Special Distribution Date shall be computed after giving
effect to the payment of principal, if any, on the Equipment Notes or other
Trust Property held in such Trust and the distribution thereof to be made on
that date.
 
    Unless otherwise described in the applicable Prospectus Supplement, the
"Pool Factor" for each Trust as of any Regular Distribution Date or Special
Distribution Date is the quotient (rounded to the seventh decimal place)
computed by dividing (i) the Pool Balance by (ii) the aggregate original
principal amount of the Equipment Notes held in such Trust. The Pool Factor for
each Trust as of any Regular Distribution Date or Special Distribution Date
shall be computed after giving effect to the payment of principal, if any, on
the Equipment Notes held in such Trust and distribution thereof to be made on
that date. The Pool Factor for each Trust will initially be 1.0000000;
thereafter, the Pool Factor for each Trust will decline as described above to
reflect reductions in the Pool Balance of such Trust. The amount of a
Certificate holder's pro rata share of the Pool Balance of a Trust can be
determined by multiplying the original denomination of the holder's Certificate
of such Trust by the Pool Factor for such Trust as of the applicable Regular
Distribution Date or Special Distribution Date. The Pool Factor and the Pool
Balance for each Trust will be mailed to Certificate holders of such Trust on
each Regular Distribution Date and Special Distribution Date.
 
REPORTS TO CERTIFICATEHOLDERS
 
    On each Regular Distribution Date and Special Distribution Date, the Trustee
will include with each distribution of a Scheduled Payment or Special Payment to
Certificateholders of the related Trust a statement, giving effect to such
distribution to be made on such Regular Distribution Date or Special
Distribution Date, setting forth the following information (per $1,000 aggregate
principal amount of Certificate for such Trust, as to (i) and (ii) below):
 
    (i) the amount of such distribution allocable to principal and the amount
       allocable to premium, if any;
 
    (ii) the amount of such distribution allocable to interest; and
 
    (iii) the Pool Balance and the Pool Factor for such Trust.
 
    So long as the Certificates are registered in the name of Cede, as nominee
for DTC, on the record date prior to each Regular Distribution Date and Special
Distribution Date, the Trustee will request from DTC a Securities Position
Listing setting forth the names of all DTC Participants reflected on DTC's books
as holding interests in the Certificates on such record date. On each Regular
Distribution Date and Special Distribution Date, the Trustee will mail to each
such DTC Participant the statement described
 
                                       10
<PAGE>
above and will make available additional copies as requested by such DTC
Participant for forwarding to Certificate Owners.
 
    In addition, after the end of each calendar year, the Trustee will prepare
for each Certificate holder of each Trust at any time during the preceding
calendar year a report containing the sum of the amounts determined pursuant to
clauses (i) and (ii) above with respect to the Trust for such calendar year or,
in the event such person was a Certificate holder during only a portion of such
calendar year, for the applicable portion of such calendar year, and such other
items as are readily available to the Trustee and which a Certificate holder
shall reasonably request as necessary for the purpose of such Certificate
holder's preparation of its federal income tax returns. Such report and such
other items shall be prepared on the basis of information supplied to the
Trustee by the DTC Participants and shall be delivered by the Trustee to such
DTC Participants to be available for forwarding by such DTC Participants to
Certificate Owners in the manner described above.
 
    At such time, if any, as the Certificates are issued in the form of
Definitive Certificates, the Trustee will prepare and deliver the information
described above to each Certificate holder of record of each Trust as the name
and period of beneficial ownership of such Certificate holder appears on the
records of the registrar of the Certificates.
 
VOTING OF EQUIPMENT NOTES
 
    Subject to the effect of any cross-subordination provisions set forth in the
related Prospectus Supplement, the Trustee, as holder of the Equipment Notes
held in each Trust, has the right to vote and give consents and waivers with
respect to such Equipment Notes under the Related Indentures. The Basic
Agreement and related Trust Supplement set forth (i) the circumstances in which
the Trustee may direct any action or cast any vote as the holder of the
Equipment Notes held in the applicable Trust at its own discretion, (ii) the
circumstances in which the Trustee shall seek instructions from the
Certificateholders of such Trust and (iii) the percentage of Certificateholders
required to direct the Trustee to take any such action. If specified in the
related Prospectus Supplement, the right of a Trustee to vote and give consents
and waivers with respect to the Equipment Notes held in the related Trust may,
in the circumstances set forth in an intercreditor agreement to be executed by
such Trustee, be exercisable by another person specified in such Prospectus
Supplement.
 
EVENTS OF DEFAULT AND CERTAIN RIGHTS UPON AN EVENT OF DEFAULT
 
    The Prospectus Supplement will specify the events of default under the Basic
Agreement (an "Event of Default") and the Related Indentures (an "Indenture
Default"). The Indenture Defaults will include events of default under the
related Leases (a "Lease Event of Default"). With respect to any Equipment Notes
which are supported by a Liquidity Facility the Indenture Defaults or Events of
Default may include events of default under such Liquidity Facility. Unless
otherwise provided in a Prospectus Supplement, all of the Equipment Notes issued
under the same Indenture will relate to a specific Aircraft and there will be no
cross-collateralization or cross-default provisions in the Indentures, and
events resulting in an Indenture Default under any particular Indenture will not
necessarily result in an Indenture Default occurring under any other Indenture.
If an Indenture Default occurs in fewer than all of the Indentures,
notwithstanding the treatment of Equipment Notes issued under any Indenture
under which an Indenture Default has occurred, payments of principal and
interest on the Equipment Notes issued pursuant to Indentures with respect to
which an Indenture Default has not occurred will continue to be made as
originally scheduled. As described below under "--Cross-Subordination Issues," a
Prospectus Supplement may provide the terms of any cross-subordination
provisions among Certificateholders of separate Trusts. If such provisions are
so provided, payments made pursuant to a Related Indenture under which an
Indenture Default has not occurred may be distributed first to the holders of
the Certificates issued under the Trust which holds the most senior Equipment
Notes issued under all Related Indentures.
 
                                       11
<PAGE>
    The ability of the applicable Owner Trustee or Owner Participant under the
Related Indenture to cure Indenture Defaults, including Indenture Defaults that
result from the occurrence of a Lease Event of Default under the related Lease
will be described in the Prospectus Supplement. Unless otherwise provided in a
Prospectus Supplement, with respect to any Certificates or Equipment Notes
entitled to the benefits of a Liquidity Facility, a drawing under any such
Liquidity Facility for the purpose of making a payment of interest as a result
of the failure by Northwest to have made a corresponding payment will not cure
an Indenture Default related to such failure by Northwest.
 
    The Prospectus Supplement related to a series of Certificates will describe
the circumstances under which the Trustee of the related Trust may vote some or
all of the Equipment Notes issued under the applicable Indenture or issued under
any Related Indentures. Such Prospectus Supplement will also set forth (i) the
percentage of Certificateholders of such Trust entitled to direct the Trustee to
take any action with respect to such Equipment Notes and, if applicable,
Equipment Notes issued under any other Related Indenture. If the Equipment Notes
outstanding under an Indenture are held by more than one Trust, then the ability
of the Certificateholders issued with respect to any one Trust to cause the Loan
Trustee with respect to any Equipment Notes held in such Trust to accelerate the
Equipment Notes under the Related Indenture or to direct the exercise of
remedies by the Loan Trustee under the Related Indenture will depend, in part,
upon the proportion between the aggregate principal amount of the Equipment
Notes outstanding under such Indenture and held in such Trust and the aggregate
principal amount of all Equipment Notes outstanding under such Indenture. In
addition, if cross-subordination provisions are applicable to any series of
Certificates, then the ability of the Certificateholders of any one Trust
holding Equipment Notes issued under Related Indentures to cause the Loan
Trustee with respect to any Equipment Notes held in such Trust to accelerate the
Equipment Notes under the Related Indenture or to direct the exercise of
remedies by the Loan Trustee under the Related Indenture will depend, in part,
upon the Class of Notes held in such Trust. If the Equipment Notes outstanding
under an Indenture are held by more than one Trust, then each Trust will hold
Equipment Notes with different terms from the Equipment Notes held in the other
Trusts and therefore the Certificateholders of a Trust may have divergent or
conflicting interests from those of the Certificateholders of the other Trusts
holding Equipment Notes relating to the same Indenture. In addition, so long as
the same institution acts as Trustee of each Trust, in the absence of
instructions from the Certificateholders of any such Trust, the Trustee for such
Trust could for the same reason be faced with a potential conflict of interest
upon an Indenture Default. In such event, the Trustee has indicated that it
would resign as Trustee of one or all such Trusts, and a successor trustee would
be appointed in accordance with the terms of the Basic Agreement.
 
    The Prospectus Supplement for a series of Certificates will specify whether
and under what circumstances the Trustee may or shall sell for cash to any
person all or part of such Equipment Notes. Any proceeds received by the Trustee
upon any such sale shall be deposited in an account established by the Trustee
for the benefit of the Certificateholders of such Trust for the deposit of such
Special Payments (the "Special Payments Account") and shall be distributed to
the Certificateholders of such Trust on a Special Distribution Date. The market
for Equipment Notes in default may be very limited, and there can be no
assurance that they could be sold for a reasonable price. Furthermore, so long
as the same institution acts as Trustee of multiple Trusts, it may be faced with
a conflict in deciding from which Trust to sell Equipment Notes to available
buyers. If the Trustee sells any such Equipment Notes with respect to which an
Indenture Default exists for less than their outstanding principal amount, the
Certificateholders of such Trust will receive a smaller amount of principal
distributions than anticipated and will not have any claim for the shortfall
against Northwest, any Owner Trustee, Owner Participant or the Trustee.
Furthermore, neither the Trustee nor the Certificateholders of such Trust could
take any action with respect to any remaining Equipment Notes held in such Trust
so long as no Indenture Defaults exist with respect thereto.
 
    Any amount, other than Scheduled Payments received on a Regular Distribution
Date, distributed to the Trustee of any Trust by the Loan Trustee under any
Indenture on account of the Equipment Notes held in such Trust following an
Indenture Default under such Indenture shall be deposited in the Special
 
                                       12
<PAGE>
Payments Account for such Trust and shall be distributed to the
Certificateholders of such Trust on a Special Distribution Date. In addition, if
a Prospectus Supplement provides that the applicable Owner Trustee may, under
circumstances specified therein, redeem or purchase the outstanding Equipment
Notes issued under the Related Indenture, the price paid by such Owner Trustee
to the Trustee of any Trust for the Equipment Notes issued under such Indenture
and held in such Trust shall be deposited in the Special Payments Account for
such Trust and shall be distributed to the Certificateholders of such Trust on a
Special Distribution Date.
 
    Any funds representing payments received with respect to any Equipment Notes
held in a Trust in default, or the proceeds from the sale by the Trustee of any
such Equipment Notes, held by the Trustee in the Special Payments Account for
such Trust shall, to the extent practicable, be invested and reinvested by the
Trustee in Permitted Investments pending the distribution of such funds on a
Special Distribution Date. "Permitted Investments" will be specified in the
related Prospectus Supplement.
 
    The Basic Agreement provides that the Trustee of each Trust shall, within 90
days after the occurrence of a default in respect of such Trust, give to the
Certificateholders of such Trust notice, transmitted by mail, of all uncured or
unwaived defaults with respect to such Trust known to it, provided that, except
in the case of default in the payment of principal, premium, if any, or interest
on any of the Equipment Notes held in such Trust, the Trustee shall be protected
in withholding such notice if it in good faith determines that the withholding
of such notice is in the interests of such Certificateholders. The term
"default" as used in this paragraph only means the occurrence of an Event of
Default with respect to a Trust as described above, except that in determining
whether any such Event of Default has occurred, any grace period or notice in
connection therewith shall be disregarded.
 
    The Basic Agreement contains a provision entitling the Trustee of each
Trust, subject to the duty of the Trustee during a default to act with the
required standard of care, to be offered reasonable security or indemnity by the
Certificateholders of such Trust before proceeding to exercise any right or
power under the Basic Agreement at the request of such Certificateholders.
 
    The Prospectus Supplement for a series of Certificates will specify the
percentage of Certificateholders entitled to waive, or to instruct the Trustee
to waive, any past Event of Default with respect to such Trust and thereby annul
any direction given with respect thereto. The Prospectus Supplement for a series
of Certificates will also specify the percentage of Certificateholders (and
whether of such Trust or of any other Trust holding Equipment Notes issued under
Related Indentures) entitled to waive, or to instruct the Trustee or the Loan
Trustee to waive, any past Indenture Default with respect to the Equipment Notes
held in such Trust and thereby annul any direction given with respect thereto.
 
MERGER, CONSOLIDATION AND TRANSFER OF ASSETS
 
    Northwest will be prohibited from consolidating with or merging into any
other corporation or transferring substantially all of its assets as an entirety
to any other corporation unless (i) the surviving successor or transferee
corporation shall (a) be a "citizen of the United States" (as defined in Section
40102(a)(15) of Title 49 of the United States Code) holding a carrier operating
certificate issued by the Secretary of Transportation pursuant to Chapter 447 of
Title 49, United States Code, for aircraft capable of carrying 10 or more
individuals or 6,000 pounds or more of cargo and with respect to which there is
in force an air carrier operating certificate issued pursuant to Part 121 of the
regulations under the sections of Title 49, United States Code, relating to
aviation and (b) expressly assume all of the obligations of Northwest contained
in the Basic Agreement and any Trust Supplement, the Note Purchase Agreements
and the Indentures and, with respect to the Leased Aircraft Notes, the
Participation Agreements and the Leases, and any other operative documents; (ii)
immediately after giving effect to such transaction, no Indenture Default (with
respect to the Owned Aircraft Notes) or Lease Event of Default (with respect to
the Leased Aircraft Notes) shall have occurred and be continuing; and (iii)
Northwest shall have delivered
 
                                       13
<PAGE>
a certificate and an opinion or opinions of counsel indicating that such
transaction, in effect, complies with such conditions.
 
MODIFICATIONS OF THE BASIC AGREEMENT
 
    The Basic Agreement contains provisions permitting Northwest, NWA Corp. and
the Trustee of each Trust to enter into a supplemental trust agreement, without
the consent of the holders of any of the Certificates of such Trust, (i) to
provide for the formation of such Trust and the issuance of a series of
Certificates, (ii) to evidence the succession of another corporation to
Northwest or NWA Corp. and the assumption by such corporation of Northwest's or
NWA Corp.'s obligations under the Basic Agreement and the applicable Trust
Supplement, (iii) to add to the covenants of Northwest or NWA Corp. for the
benefit of holders of such Certificates, or to surrender any right or power in
the Basic Agreement conferred upon Northwest or NWA Corp., (iv) to cure any
ambiguity or correct or supplement any defective or inconsistent provision of
the Basic Agreement or the applicable Trust Supplement or to make any other
provisions with respect to matters or questions arising thereunder, provided
such action shall not adversely affect the interests of the holders of such
Certificates, or to cure any ambiguity or correct any mistake, (v) to modify,
eliminate or add to the provisions of the Basic Agreement to the extent as shall
be necessary to continue the qualification of the Basic Agreement (including any
supplemental agreement) under the Trust Indenture Act of 1939, as amended (the
"Trust Indenture Act") and to add to the Basic Agreement such other provisions
as may be expressly permitted by the Trust Indenture Act, (vi) to provide for a
successor Trustee or to add to or change any provision of the Basic Agreement as
shall be necessary to facilitate the administration of the Trusts thereunder by
more than one Trustee, (vii) to add, eliminate or change any provisions under
such Basic Agreement that will not adversely affect the Certificateholders in
any material respect, provided that in each case, such modification does not
cause the corresponding Trust to become taxable as an "association" within the
meaning of Treasury Regulation Section 301.7701-2 or a "publicly traded
partnership" within the meaning of Section 7704 of the Code taxable as a
corporation and (viii) to make any other amendments or modifications to the
Basic Agreement, provided such amendments or modifications shall only apply to
Certificates issued thereafter.
 
    The Basic Agreement also contains provisions permitting Northwest, NWA Corp.
and the Trustee of each Trust, with the consent of the Certificateholders of
such Trust evidencing fractional undivided interests aggregating not less than a
majority in interest of such Trust, and, with respect to any Leased Aircraft,
with the consent of the applicable Owner Trustee (such consent not to be
unreasonably withheld), to execute supplemental trust agreements adding any
provisions to or changing or eliminating any of the provisions of the Basic
Agreement, to the extent relating to such Trust, and the applicable Trust
Supplement, or modifying the rights of the Certificateholders, except that no
such supplemental trust agreement may, without the consent of each Certificate
holder so affected thereby, (a) reduce in any manner the amount of, or delay the
timing of, any receipt by the Trustee of payments on the Equipment Notes held in
such Trust or distributions in respect of any Certificate related to such Trust,
or change the date or place of any payment in respect of any Certificate, or
make distributions payable in coin or currency other than that provided for in
such Certificates, or impair the right of any Certificate holder of such Trust
to institute suit for the enforcement of any such payment when due, (b) permit
the disposition of any Equipment Note held in such Trust, except as provided in
the Basic Agreement or the applicable Trust Supplement, or otherwise deprive any
Certificate holder of the benefit of the ownership of the applicable Equipment
Notes, (c) reduce the percentage of the aggregate fractional undivided interests
of the Trust provided for in the Basic Agreement or the applicable Trust
Supplement, the consent of the holders of which is required for any such
supplemental trust agreement or for any waiver provided for in the Basic
Agreement or such Trust Supplement, (d) modify any of the provisions relating to
the rights of the Certificateholders in respect of the waiver of events of
default or receipt of payment or (e) cause the Trust to become taxable as an
"association" within the meaning of Treasury Regulation Section 301.7701-2 or a
"publicly traded partnership" within the meaning of Section 7704 of the Code
taxable as a corporation.
 
                                       14
<PAGE>
MODIFICATION OF INDENTURE AND RELATED AGREEMENTS
 
    The Prospectus Supplement will specify the Trustee's obligations in the
event that the Trustee, as the holder of any Equipment Notes held in a Trust,
receives a request for its consent to any amendment, modification or waiver
under the Indenture or other documents relating to such Equipment Notes
(including any Lease with respect to Leased Aircraft Notes or any Liquidity
Facility).
 
CROSS-SUBORDINATION ISSUES
 
    The Equipment Notes issued under an Indenture may be held in more than one
Trust and one Trust may hold Equipment Notes issued under more than one Related
Indenture. Unless otherwise provided in a Prospectus Supplement, only Equipment
Notes of the same Class may be held in the same Trust. In such event, payments
made on account of a subordinate Class of Equipment Notes issued under a Related
Indenture may, under circumstances described in the related Prospectus
Supplement, be subordinated to the prior payment of all amounts owing to
Certificateholders of a Trust which holds senior Equipment Notes issued under
all Related Indentures. The Prospectus Supplement related to an issuance of
Certificates will describe any such "cross-subordination" provisions and any
related terms, including the percentage of Certificateholders under any Trust
which are permitted to (i) grant waivers of defaults under any Related
Indenture, (ii) consent to the amendment or modification of any Related
Indentures or (iii) direct the exercise of remedial actions under any Related
Indentures.
 
TERMINATION OF THE TRUSTS
 
    The obligations of Northwest, NWA Corp. and the Trustee with respect to a
Trust will terminate upon the distribution to Certificateholders of such Trust
of all amounts required to be distributed to them pursuant to the Basic
Agreement and the applicable Trust Supplement and the disposition of all
property held in such Trust. The Trustee will send to each Certificate holder of
record of such Trust notice of the termination of such Trust, the amount of the
proposed final payment and the proposed date for the distribution of such final
payment for such Trust. The final distribution to any Certificate holder of such
Trust will be made only upon surrender of such Certificate holder's Certificates
at the office or agency of the Trustee specified in such notice of termination.
 
DELAYED PURCHASE
 
    In the event that, on the delivery date of any Certificates, all of the
proceeds from the sale of such Certificates are not used to purchase the
Equipment Notes contemplated to be held in the related Trust, such Equipment
Notes may be purchased by the Trustee at any time on or prior to the date
specified in the applicable Prospectus Supplement. In such event, the Trustee
will hold the proceeds from the sale of such Certificates not used to purchase
Equipment Notes in an escrow account pending the purchase of the Equipment Notes
not so purchased. Such proceeds will be invested at the direction and risk of,
and for the account of, Northwest in certain specified investments, which may
include: (i) obligations of, or guaranteed by, the United States Government or
agencies thereof, (ii) open market commercial paper of any corporation
incorporated under the laws of the United States of America or any State thereof
rated at least P-2 or its equivalent by Moody's Investors Service, Inc. or at
least A-2 or its equivalent by Standard & Poor's Corporation, (iii) certificates
of deposit issued by commercial banks organized under the laws of the United
States or of any political subdivision thereof having a combined capital and
surplus in excess of $500,000,000 which banks or their holding companies have a
rating of A or its equivalent by Moody's Investors Service, Inc. or Standard &
Poor's Corporation, provided, however, that the aggregate amount at any one time
so invested in certificates of deposit issued by any one bank shall not exceed
5% of such bank's capital and surplus, (iv) U.S. dollar denominated offshore
certificates of deposit issued by, or offshore time deposits with, any
commercial bank described in clause (iii) above or any subsidiary thereof and
(v) repurchase agreements with any financial institution having combined capital
and surplus of at least $500,000,000 with any of the obligations described in
(i) through (iv) as collateral; provided that if all
 
                                       15
<PAGE>
of the above investments are unavailable, the entire amounts to be invested may
be used to purchase federal funds from an entity described in clause (iii)
above; and provided further that no investment shall be eligible as a "specified
investment" unless the final maturity date or date of return of such investment
is on or before (x) the scheduled date for the purchase of such Equipment Notes,
or (y) if no date has been scheduled for the purchase of such Equipment Notes,
the next Business Day, or (z) if Northwest has given notice that such Equipment
Notes will not be purchased, the next applicable Special Distribution Date.
Earnings on such investments in the escrow account for each Trust will be paid
to Northwest periodically, and Northwest will be responsible for any losses.
 
    On the next Regular Distribution Date specified in the applicable Prospectus
Supplement, Northwest will pay to the Trustee an amount equal to the interest
that would have accrued on any Equipment Notes purchased after the date of the
issuance of such Certificates from the date of the issuance of such Certificates
to, but excluding, the date of the purchase of such Equipment Notes by the
Trustee.
 
SPECIAL DISTRIBUTION UPON UNAVAILABILITY OF AIRCRAFT
 
    To the extent that, due to a casualty to, or other event causing the
unavailability of, one or more Aircraft, the full amount of the proceeds from
the sale of any Certificates held in the escrow account referred to above is not
used to purchase Equipment Notes on or prior to the date specified in the
applicable Prospectus Supplement, an amount equal to the unused proceeds will be
distributed by the Trustee to the holders of record of such Certificates on a
pro rata basis upon not less than 20 days' prior notice to them on a Special
Distribution Date, together with interest thereon at a rate equal to the rate
applicable to such Certificates, but without premium, and Northwest will pay to
the Trustee on such date an amount equal to such interest.
 
THE PARENT GUARANTY
 
    NWA Corp. will unconditionally guarantee (i) with respect to related Owned
Aircraft Notes, the full and prompt payment of principal, premium, if any, and
interest thereon when and as the same shall become due and payable, whether at
maturity, upon redemption or otherwise, and (ii) with respect to related Leased
Aircraft Notes, the full and prompt payment of all amounts payable by Northwest
under the related Lease when and as the same shall become due and payable. The
Parent Guaranty will be enforceable without any need first to enforce any Owned
Aircraft Note or Lease against Northwest. The Parent Guaranty will be an
unsecured obligation of NWA Corp.
 
LIQUIDITY FACILITY
 
    The related Prospectus Supplement may provide that one or more payments of
interest on the Certificates of one or more series will be supported by a
Liquidity Facility issued by an institution identified in the related Prospectus
Supplement. The provider of such Liquidity Facility will have a claim senior to
the Certificateholders' as specified in the related Prospectus Supplement.
 
THE TRUSTEE
 
    The Trustee for each series of Certificates will be identified in the
Prospectus Supplement. With certain exceptions, the Trustee makes no
representations as to the validity or sufficiency of the Basic Agreement, the
Trust Supplements, the Certificates, the Equipment Notes, the Indentures, the
Leases or other related documents. The Trustee shall not be liable with respect
to any series of Certificates, for any action taken or omitted to be taken by it
in good faith in accordance with the direction of the holders of a majority in
principal amount of outstanding Certificates of such series issued under the
Basic Agreement. Subject to such provisions, such Trustee shall be under no
obligation to exercise any of its rights or powers under the Basic Agreement at
the request of any holders of Certificates issued thereunder unless they shall
have offered to the Trustee indemnity satisfactory to it. The Basic Agreement
provides that the Indenture
 
                                       16
<PAGE>
Trustee in its individual or any other capacity may acquire and hold
Certificates issued thereunder and, subject to certain conditions, may otherwise
deal with Northwest and, with respect to the Leased Aircraft, with any Owner
Trustee with the same rights it would have if it were not the Trustee.
 
    The Trustee may resign with respect to any or all of the Trusts at any time,
in which event Northwest will be obligated to appoint a successor trustee. If
the Trustee ceases to be eligible to continue as Trustee with respect to a Trust
or becomes incapable of acting as Trustee or becomes insolvent, Northwest may
remove such Trustee, or any Certificate holder of such Trust for at least six
months may, on behalf of himself and all others similarly situated, petition any
court of competent jurisdiction for the removal of such Trustee and the
appointment of a successor trustee. Any resignation or removal of the Trustee
with respect to a Trust and appointment of a successor trustee for such Trust
does not become effective until acceptance of the appointment by the successor
trustee. Pursuant to such resignation and successor trustee provisions, it is
possible that a different trustee could be appointed to act as the successor
trustee with respect to each Trust. All references in this Prospectus to the
Trustee should be read to take into account the possibility that the Trusts
could have different successor trustees in the event of such a resignation or
removal.
 
    The Basic Agreement provides that Northwest will pay the Trustee's fees and
expenses and indemnify the Trustee against certain liabilities.
 
                       DESCRIPTION OF THE EQUIPMENT NOTES
 
    The statements made under this caption are summaries and reference is made
to the entire Prospectus and detailed information appearing in the applicable
Prospectus Supplement. Where no distinction is made between the Leased Aircraft
Notes and the Owned Aircraft Notes or between their respective Indentures, such
statements refer to any Equipment Notes and any Indenture.
 
    TO THE EXTENT THAT ANY PROVISION IN ANY PROSPECTUS SUPPLEMENT IS
INCONSISTENT WITH ANY PROVISION IN THIS SUMMARY, THE PROVISION OF SUCH
PROSPECTUS SUPPLEMENT WILL CONTROL.
 
GENERAL
 
    All Equipment Notes will be issued under a separate Indenture either (a)
between the related Owner Trustee of a trust for the benefit of the Owner
Participant who is the beneficial owner of the related Aircraft, and the related
Loan Trustee, or (b) between Northwest and the related Loan Trustee. The
Equipment Notes issued pursuant to clause (a) of the preceding sentence will be
nonrecourse obligations of the applicable Owner Trust. Each Equipment Note will
be authenticated under an Indenture by the Loan Trustee. All Equipment Notes
issued under the same Indenture will relate to, and be secured by, one or more
Aircraft identified and described in the related Prospectus Supplement and
which, in the case of Equipment Notes issued as described in such clause (a),
are leased to Northwest pursuant to a Lease between the Owner Trustee under the
applicable Owner Trust and Northwest or, in the case of Equipment Notes issued
as described in clause (b), owned by Northwest.
 
    With respect to each Leased Aircraft, the related Owner Trustee has acquired
or will acquire such Aircraft from Northwest or the manufacturer of such
Aircraft, as the case may be, has granted or will grant a security interest in
such Aircraft to the related Loan Trustee as security for the payments of the
related Leased Aircraft Notes, and has leased or will lease such Aircraft to
Northwest pursuant to the related Lease which has been or will be assigned to
the related Loan Trustee. Pursuant to each such Lease, Northwest will be
obligated to make or cause to be made rental and other payments to the related
Loan Trustee on behalf of the related Owner Trustee in amounts that will be
sufficient to make payments of the principal, interest and premium, if any,
required to be made in respect of such Leased Aircraft Notes when and as due and
payable.
 
                                       17
<PAGE>
    The rental obligations of Northwest under each Lease and the obligations of
Northwest under each Owned Aircraft Indenture and under the Owned Aircraft Notes
will be general obligations of Northwest. Except in certain circumstances
involving Northwest's purchase of a Leased Aircraft and the assumption of the
Leased Aircraft Notes related thereto, the Leased Aircraft Notes are not
obligations of, or guaranteed by, Northwest.
 
PRINCIPAL AND INTEREST PAYMENTS
 
    Interest received by the Trustee on the Equipment Notes held in each Trust
will be passed through to the Certificateholders of such Trust on the dates and
at the rate per annum set forth in the applicable Prospectus Supplement until
the final distribution for such Trust. Principal received by the Trustee on the
Equipment Notes held in each Trust will be passed through to the
Certificateholders of such Trust in scheduled amounts on the dates set forth in
the applicable Prospectus Supplement until the final distribution date for such
Trust.
 
    If any date scheduled for any payment of principal, premium, if any, or
interest with respect to the Equipment Notes is not a Business Day, such payment
will be made on the next succeeding Business Day without any additional
interest.
 
REDEMPTION
 
    The applicable Prospectus Supplement will describe the circumstances,
whether voluntary or involuntary, under which the Equipment Notes may be
redeemed or purchased prior to the stated maturity date thereof, in whole or in
part, the premium, if any, applicable upon certain redemptions or purchases and
other terms applying to the redemptions or purchases of such Equipment Notes.
 
SECURITY
 
    The Leased Aircraft Notes will be secured by (i) an assignment by the
related Owner Trustee to the related Loan Trustee of such Owner Trustee's rights
(except for certain rights, including those described below) under the Lease or
Leases with respect to the related Aircraft, including the right to receive
payments of rent thereunder, (ii) a mortgage granted to such Loan Trustee in
such Aircraft, subject to the rights of Northwest under such Lease or Leases and
(iii) an assignment to such Loan Trustee of certain of such Owner Trustee's
rights with respect to such Aircraft under the purchase agreement between
Northwest and the related manufacturer. Under the terms of each Lease,
Northwest's obligations in respect of each Leased Aircraft will be those of a
lessee under a "net lease." Accordingly, Northwest will be obligated, among
other things and at its expense, to cause each Leased Aircraft to be duly
registered, to pay all costs of operating such Aircraft and to maintain,
service, repair and overhaul (or cause to be maintained, serviced, repaired and
overhauled) such Aircraft. With respect to the Leased Aircraft, the assignment
by the related Owner Trustee to the related Loan Trustee of its rights under the
related Lease will exclude, among other things, rights of such Owner Trustee and
the related Owner Participant relating to indemnification by Northwest for
certain matters, insurance proceeds payable to such Owner Trustee in its
individual capacity and to such Owner Participant under liability insurance
maintained by Northwest pursuant to such Lease or by such Owner Trustee or such
Owner Participant, insurance proceeds payable to such Owner Trustee in its
individual capacity or to such Owner Participant under certain casualty
insurance maintained by such Owner Trustee or such Owner Participant pursuant to
such Lease and any rights of such Owner Participant or such Owner Trustee to
enforce payment of the foregoing amounts and their respective rights to the
proceeds of the foregoing.
 
    The Owned Aircraft Notes will be secured by (i) a mortgage granted to the
related Loan Trustee of all of Northwest's right, title and interest in and to
such Owned Aircraft and (ii) an assignment to such Loan Trustee of certain of
Northwest's rights with respect to such Aircraft under the purchase agreement
between Northwest and the related manufacturer. Under the terms of each Owned
Aircraft Indenture,
 
                                       18
<PAGE>
Northwest will be obligated, among other things and at its expense, to cause
each Owned Aircraft to be duly registered, to pay all costs of operating such
Aircraft and to maintain, service, repair and overhaul (or cause to be
maintained, serviced, repaired and overhauled) such Aircraft.
 
    The Prospectus Supplement will specify the required insurance coverage with
respect to the Aircraft.
 
    Northwest will be required, except under certain circumstances, to keep each
Aircraft registered under the Federal Aviation Act of 1958 (the "Federal
Aviation Act"), and to record the Indenture and the Lease, if applicable, among
other documents, with respect to each Aircraft under the Federal Aviation Act.
Such recordation of the Indenture, the Lease, if applicable, and other documents
with respect to each Aircraft will give the related Loan Trustee a perfected
security interest in the related Aircraft whenever it is located in the United
States or any of its territories and possessions; the Convention on the
International Recognition of Rights in Aircraft (the "Convention") provides that
such security will also be recognized, with certain limited exceptions, in those
jurisdictions that have ratified or adhere to the Convention. Although Northwest
has no current intention to do so, Northwest will have the right, subject to
certain conditions, at its own expense to register each Aircraft in countries
other than the United States. Unless otherwise specified in the applicable
Prospectus Supplement, prior to any such change in the jurisdiction of registry,
the related Loan Trustee shall have received an opinion of Northwest's counsel
that, among other things, confirms the perfected status of the lien of the
Related Indenture and, in the case of Leased Aircraft, confirms the validity and
enforceability of the related Lease in such jurisdiction, in each case subject,
in certain cases, to certain filings, recordations or other actions. Each
Aircraft may also be operated by Northwest or under lease, sublease or
interchange arrangements in countries that are not parties to the Convention.
The extent to which the related Loan Trustee's security interest would be
recognized in an Aircraft located in a country that is not a party to the
Convention, and the extent to which such security interest would be recognized
in a jurisdiction adhering to the Convention if the Aircraft is registered in a
jurisdiction not a party to the Convention, is uncertain. Moreover, in the case
of an Indenture Default, the ability of the related Loan Trustee to realize upon
its security interest in an Aircraft could be adversely affected as a legal or
practical matter if such Aircraft were registered or located outside the United
States.
 
    Unless otherwise specified in the applicable Prospectus Supplement, the
Equipment Notes will not be cross-collateralized and consequently the Equipment
Notes issued in respect of any one Aircraft will not be secured by any other
Aircraft or, in the case of Leased Aircraft Notes, the Lease related thereto.
Unless and until an Indenture Default with respect to a Leased Aircraft has
occurred and is continuing, the related Loan Trustee may exercise only limited
rights of the related Owner Trustee under the related Lease.
 
    Funds, if any, held from time to time by the Loan Trustee with respect to
any Aircraft, prior to the distribution thereof, will be invested and reinvested
by such Loan Trustee. Such investment and reinvestment will be at the direction
of Northwest (except, with respect to a Leased Aircraft, in the case of a Lease
Event of Default under the applicable Lease or, with respect to an Owned
Aircraft, in the case of an Indenture Default under the applicable Indenture),
in certain investments described in the Related Indenture. The net amount of any
loss resulting from any such investments will be paid by Northwest.
 
    Section 1110 of the Bankruptcy Code provides that, in reorganization cases
under Chapter 11 of the Bankruptcy Code, the right of a lessor with respect to,
and of the holder of a security interest in, aircraft capable of carrying 10 or
more individuals or 6,000 pounds or more of cargo (subject to certain
limitations in the case of any such aircraft first placed in service on or prior
to October 22, 1994) leased to or subject to a security interest granted by a
citizen of the United States (as defined in the Federal Aviation Act) holding an
air carrier operating certificate issued by the Secretary of Transportation
pursuant to the Federal Aviation Act for such aircraft (a certificate which
Northwest presently possesses) to take possession of such aircraft in compliance
with the provisions of the lease or security agreement is not affected by (a)
the automatic stay provision of the Bankruptcy Code, which provision generally
enjoins the taking of
 
                                       19
<PAGE>
any action against a debtor by a creditor, (b) the provision of the Bankruptcy
Code allowing the trustee or debtor-in-possession to use, sell or lease property
of the estate and (c) any power of the bankruptcy court to enjoin a
repossession. Section 1110 provides, however, that the right of a lessor or
secured party to take possession of an aircraft in compliance with the
provisions of the lease or security agreement in the event of a default may not
be exercised for 60 days following the date of commencement of the
reorganization proceedings (unless specifically permitted by the bankruptcy
court) and may not be exercised at all if, within such 60-day period, the
trustee or debtor-in-possession agrees to perform the debtor's obligations that
become due on or after such date and cures all existing defaults (other than
defaults resulting solely from the financial condition, bankruptcy, insolvency
or reorganization of the debtor). Section 1110 does not prevent the trustee or
debtor-in-possession from rejecting a lease (including any Lease) or demanding a
renegotiation of such lease as a condition to not rejecting such lease. In
addition, if more than one aircraft are leased pursuant to a master lease and
accompanying lease supplement, the applicability of Section 1110 would be
determined on an aircraft-by-aircraft basis. Assuming Section 1110 is applicable
to all aircraft subject to a master lease, Section 1110 does not prevent the
trustee or debtor-in-possession from complying with the provisions of Section
1110 with respect to some lease supplements, and thereby retaining possession of
the related aircraft, and not complying with the provisions of Section 1110 with
respect to other lease supplements, and thereby enabling a repossession of other
aircraft.
 
    In connection with any issuance of Certificates under this Prospectus and
the applicable Prospectus Supplement, Northwest shall have received an opinion
from its counsel to the effect that (i) with respect to any Leased Aircraft, the
related Owner Trustee, as lessor under the related Lease, and the related Loan
Trustee, upon foreclosure of the Owner Trustee's interest in such Lease as
assignee of such Owner Trustee's rights under such Lease pursuant to the Related
Indenture, would be entitled to the benefits of Section 1110 of the Bankruptcy
Code with respect to the Aircraft initially delivered under such Lease and
subjected to the Related Indenture or (ii) with respect to any Owned Aircraft,
the related Loan Trustee under the Related Indenture would be entitled to the
benefits of Section 1110 of the Bankruptcy Code with respect to the Aircraft
initially subjected to the Related Indenture. Such opinions will not address the
possible replacement of an Aircraft after an Event of Loss (as defined in the
Indenture) in the future.
 
RANKING OF EQUIPMENT NOTES
 
    Some of the Equipment Notes related to one or more Aircraft, as described in
the related Prospectus Supplement, may be subordinated and junior in right of
payment to other Equipment Notes related to the same Aircraft. The terms of such
subordination, if any, will be described in the related Prospectus Supplement.
 
PAYMENTS AND LIMITATION OF LIABILITY
 
    Each Leased Aircraft will be leased by the related Owner Trustee to
Northwest for a term commencing on the delivery date thereof to such Owner
Trustee and expiring on a date not earlier than the latest maturity date of the
related Leased Aircraft Notes, unless previously terminated as permitted by the
terms of the related Lease. The basic rent and other payments under each such
Lease will be payable by Northwest in accordance with the terms specified in the
applicable Prospectus Supplement, and will be assigned by the related Owner
Trustee under the Related Indenture to the Loan Trustee to provide the funds
necessary to pay principal of, premium, if any, and interest due from such Owner
Trustee on the Leased Aircraft Notes issued under such Indenture. In certain
cases, the basic rent payments under a Lease may be adjusted, but each Lease
will provide that under no circumstances will rent payments by Northwest be less
than the scheduled payments on the related Leased Aircraft Notes. The balance of
any basic rent payment under each Lease, after payment of amounts due on the
Leased Aircraft Notes issued under the Indenture corresponding to such Lease,
will be paid over to the applicable Owner Participant. Northwest's obligation to
pay rent and to cause other payments to be made under each Lease will be general
obligations of Northwest.
 
                                       20
<PAGE>
    With respect to the Leased Aircraft Notes, except in certain circumstances
involving Northwest's purchase of a Leased Aircraft and the assumption of the
Leased Aircraft Notes related thereto, the Leased Aircraft Notes will not be
obligations of, or guaranteed by, Northwest. With respect to the Leased Aircraft
Notes, none of the Owner Trustees, the Owner Participants or the Loan Trustees
shall be personally liable to any holder of such Leased Aircraft Notes for
amounts payable under such Leased Aircraft Notes, or, except as provided in the
Indentures relating thereto in the case of the Owner Trustees and the Loan
Trustees, for any liability under such Indentures. Except in the circumstances
referred to above, all amounts payable under any Leased Aircraft Notes (other
than payments made in connection with an optional redemption or purchase by the
related Owner Trustee or the related Owner Participant) will be made only from
(i) the assets subject to the lien of the Related Indenture with respect to such
Aircraft or the income and proceeds received by the related Loan Trustee
therefrom (including rent payable by Northwest under the related Lease) or (ii)
if so provided in the related Prospectus Supplement, the applicable Liquidity
Facility.
 
    With respect to the Leased Aircraft Notes, except as otherwise provided in
the Related Indentures, no Owner Trustee shall be personally liable for any
amount payable or for any statements, representations, warranties, agreements or
obligations under such Indentures or under such Leased Aircraft Notes except for
its own willful misconduct or gross negligence. None of the Owner Participants
shall have any duty or responsibility under the Leased Aircraft Indentures or
under such Leased Aircraft Notes to the related Loan Trustee or to any holder of
any such Leased Aircraft Note.
 
    Northwest's obligations under each Owned Aircraft Indenture and under the
Owned Aircraft Notes will be general obligations of Northwest.
 
DEFEASANCE OF THE INDENTURES AND THE EQUIPMENT NOTES IN CERTAIN CIRCUMSTANCES
 
    Unless otherwise specified in the applicable Prospectus Supplement, the
applicable Indenture provides that the obligations of the related Loan Trustee
and, with respect to any Leased Aircraft Notes, the related Owner Trustee or,
with respect to any Owned Aircraft Notes, Northwest under the applicable
Indenture shall be deemed to have been discharged and paid in full (except for
certain obligations, including the obligations to register the transfer or
exchange of Equipment Notes, to replace stolen, lost, destroyed or mutilated
Equipment Notes and to maintain paying agencies and hold money for payment in
trust) on the 91st day after the date of irrevocable deposit with the related
Loan Trustee of money or certain obligations of the United States or any agency
or instrumentality thereof the payment of which is backed by the full faith and
credit of the United States which, through the payment of principal and interest
in respect thereof in accordance with their terms, will provide money in an
aggregate amount sufficient to pay when due (including as a consequence of
redemption in respect of which notice is given on or prior to the date of such
deposit) principal of, premium, if any, and interest on all Equipment Notes
issued thereunder in accordance with the terms of such Indenture. Such discharge
may occur only if, among other things, there has been published by the Internal
Revenue Service a ruling to the effect that holders of such Equipment Notes will
not recognize income, gain or loss for federal income tax purposes as a result
of such deposit, defeasance and discharge and will be subject to federal income
tax on the same amount and in the same manner and at the same time as would have
been the case if such deposit, defeasance and discharge had not occurred.
 
    Upon such defeasance, or upon payment in full of the principal of, premium,
if any, and interest on all Equipment Notes issued under any Indenture on the
maturity date therefor or deposit with the applicable Loan Trustee of money
sufficient therefor no earlier than one year prior to the date of such maturity,
the holders of such Equipment Notes will have no beneficial interest in or other
rights with respect to the related Aircraft or other assets subject to the lien
of such Indenture and such lien shall terminate.
 
                                       21
<PAGE>
ASSUMPTION OF OBLIGATIONS BY NORTHWEST
 
    Unless otherwise specified in the applicable Prospectus Supplement with
respect to Leased Aircraft, upon the exercise by Northwest of any purchase
options it may have under the related Lease prior to the end of the term of such
Lease, Northwest may assume on a full recourse basis all of the obligations of
the Owner Trustee (other than its obligations in its individual capacity) under
the Indenture with respect to such Aircraft, including the obligations to make
payments in respect of the related Leased Aircraft Notes. In such event, certain
relevant provisions of the related Lease, including (among others) provisions
relating to maintenance, possession and use of the related Aircraft, liens,
insurance and events of default will be incorporated into such Indenture, and
the Leased Aircraft Notes issued under such Indenture will not be redeemed and
will continue to be secured by such Aircraft. It is a condition to such
assumption that, if such Aircraft is registered under the laws of the United
States, an opinion of counsel be delivered at the time of such assumption
substantially to the effect that the related Loan Trustee under such Indenture
should, immediately following such assumption, be entitled to the benefits of
Section 1110 of the Bankruptcy Code with respect to such Aircraft (including the
engines related thereto), but such opinion need not be delivered to the extent
that the benefits of such Section 1110 are not available to the Loan Trustee
with respect to such Aircraft or any engine related thereto immediately prior to
such assumption.
 
LIQUIDITY FACILITY
 
    The related Prospectus Supplement may provide that one or more payments of
interest on the related Equipment Notes of one or more series or distributions
made by the Trustee of the related Trust will be supported by a Liquidity
Facility issued by an institution identified in the related Prospectus
Supplement. Unless otherwise provided in the related Prospectus Supplement, the
provider of the Liquidity Facility will have a senior claim upon the assets
securing the Equipment Notes.
 
INTERCREDITOR ISSUES
 
    Equipment Notes may be issued in different Classes, which means that the
Equipment Notes may have different payment priorities even though they are
issued by the same Owner Trustee and relate to the same Aircraft. In such event,
the related Prospectus Supplement will describe the priority of distributions
among such Equipment Notes (and any Liquidity Facilities therefor), the ability
of any Class to exercise and/or enforce any or all remedies with respect to the
related Aircraft (and, if the Equipment Notes are Leased Aircraft Notes, the
Lease related thereto) and certain other intercreditor terms and provisions.
 
                 UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
 
GENERAL
 
    The following discussion describes the principal U.S. federal income tax
consequences to Certificateholders of the purchase, ownership and disposition of
the Certificates and in the opinion of Cadwalader, Wickersham & Taft such
discussion is accurate in all material respects of the matters discussed herein.
Except as otherwise specified, the discussion is addressed to beneficial owners
of Certificates ("U.S. Certificateholders") that are citizens or residents of
the United States, corporations, partnerships or other entities created or
organized in or under the laws of the United States or any State, or estates or
trusts the income of which is subject to U.S. federal income taxation regardless
of its source ("U.S. Persons") that will hold the Certificates as capital
assets. This discussion does not address the tax treatment of U.S.
Certificateholders that may be subject to special tax rules, such as banks,
insurance companies, dealers in securities or commodities, tax-exempt entities,
holders that will hold Certificates as part of a straddle or holders that have a
"functional currency" other than the U.S. Dollar, nor does it address the tax
treatment of U.S. Certificateholders that do not acquire Certificates as part of
the initial offering. This discussion does not describe any tax consequences
arising under the laws of any State, locality or taxing jurisdiction other than
the United States.
 
                                       22
<PAGE>
    This discussion is based upon the tax laws of the United States as in effect
on the date of this Prospectus, as well as judicial and administrative
interpretations thereof (in final or proposed form) available on or before such
date. All of the foregoing are subject to change or differing interpretations,
which could apply retroactively. Prospective investors should note that no
rulings have been or will be sought from the Internal Revenue Service (the
"IRS") with respect to any of the federal income tax consequences discussed
below, and no assurance can be given the IRS will not take contrary positions.
PROSPECTIVE INVESTORS SHOULD CONSULT THEIR OWN TAX ADVISORS WITH RESPECT TO THE
FEDERAL, STATE, LOCAL AND FOREIGN TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP
AND DISPOSITION OF THE CERTIFICATES.
 
TAX STATUS OF THE TRUSTS
 
    In the opinion of Cadwalader, Wickersham & Taft, special tax counsel to
Northwest, in the case of each Series of Certificates, each Trust will be
classified as a grantor trust under subpart E, Part I of Subchapter J of the
Internal Revenue Code of 1986, as amended (the "Code") and not as an association
taxable as a corporation for U.S. federal income tax purposes. Accordingly, each
U.S. Certificate holder will be subject to federal income taxation as if it
owned directly a pro rata undivided interest in each asset owned by the
corresponding Trust and paid directly its share of fees and expenses paid by
such Trust.
 
TAXATION OF CERTIFICATEHOLDERS GENERALLY
 
    A U.S. Certificate holder will be treated as owning its pro rata undivided
interest in each of the Equipment Notes and any other property held by the
related Trust. Accordingly, each U.S. Certificate holder's share of interest
paid on the Equipment Notes will be taxable as ordinary income, as it is paid or
accrued, in accordance with such owner's method of accounting for U.S. federal
income tax purposes and a U.S. Certificate holder's share of premium, if any,
paid on the Equipment Notes will be treated as capital gain. Any amounts
received by a Trust from Interest Drawings under the relevant Liquidity Facility
will be treated for U.S. federal income tax purposes as having the same
characteristics as the payments they replace.
 
    Each U.S. Certificate holder will be entitled to deduct, consistent with its
method of accounting, its pro rata share of fees and expenses paid or incurred
by the corresponding Trust as provided in Section 162 or 212 of the Code.
Certain fees and expenses, including fees paid to the Trustee and the Liquidity
Provider, will be borne by parties other than the Certificateholders. It is
possible that such fees and expenses will be treated as constructively received
by the Trust, in which event a U.S. Certificate holder will be required to
include in income and will be entitled to deduct its pro rata share of such fees
and expenses. If a U.S. Certificate holder is an individual, estate or trust,
the deduction for such holder's share of such fees or expenses will be allowed
only to the extent that all of such holder's miscellaneous itemized deductions,
including such holder's share of such fees and expenses, exceed 2% of such
holder's adjusted gross income. In addition, in the case of U.S.
Certificateholders who are individuals, certain otherwise allowable itemized
deductions will be subject generally to additional limitations on itemized
deductions under the applicable provisions of the Code.
 
EFFECT OF SUBORDINATION OF SUBORDINATED CERTIFICATEHOLDERS
 
    If any Trust with respect to a Series are subordinated with respect to other
Trusts of the same Series (such Trusts being the "Subordinated Trusts" and the
related Certificates being the "Subordinated Certificates") receives less than
the full amount of the receipts of principal or interest paid with respect to
the Equipment Notes held by it (any shortfall in such receipts being the
"Shortfall Amounts") because of the subordination of the Equipment Notes held by
such Trust under the Intercreditor Agreement, the corresponding owners of
beneficial interests in the Subordinated Certificates (the "Subordinated
Certificateholders") would probably be treated for federal income tax purposes
as if they had (1) received as distributions their full share of such receipts,
(2) paid over to the relevant preferred class of Certificateholders an amount
equal to their share of such Shortfall Amount, and (3) retained the right to
 
                                       23
<PAGE>
reimbursement of such amounts to the extent of future amounts payable to such
Subordinated Certificateholders with respect to such Shortfall Amount.
 
    Under this analysis, (1) Subordinated Certificateholders incurring a
Shortfall Amount would be required to include as current income any interest or
other income of the corresponding Subordinated Trust that was a component of the
Shortfall Amount, even though such amount was in fact paid to the relevant
preferred class of Certificateholders, (2) a loss would only be allowed to such
Subordinated Certificateholders when their right to receive reimbursement of
such Shortfall Amount became worthless (i.e., when it becomes clear that funds
will not be available from any source to reimburse such loss), and (3)
reimbursement of such Shortfall Amount prior to such a claim of worthlessness
would not be taxable income to Subordinated Certificateholders because such
amount was previously included in income. These results should not significantly
affect the inclusion of income for Subordinated Certificateholders on the
accrual method of accounting, but could accelerate inclusion of income to
Subordinated Certificateholders on the cash method of accounting by, in effect,
placing them on the accrual method.
 
ORIGINAL ISSUE DISCOUNT
 
    The Equipment Notes may be issued with original issue discount ("OID"),
which may require U.S. Certificateholders to include such OID in gross income in
advance of the receipt or accrual of the stated interest on such Equipment
Notes. The Prospectus Supplement will state whether any Equipment Notes to be
held by the related Trust will be issued with OID. Generally, a holder of a debt
instrument issued with original issue discount that is not DE MINIMIS must
include such original issue discount in income for federal income tax purposes
as it accrues, in advance of the receipt of the cash attributable to such
income, under a method that takes into account the compounding of interest.
 
MARKET DISCOUNT
 
    Generally, the term "market discount" means the excess of the remaining
principal amount of a Certificate over the holder's tax basis in such
Certificate immediately after its acquisition, subject to a DE MINIMIS
exception.
 
    A holder who acquires a Certificate at a market discount will be required to
treat any gain realized on the disposition of such Certificate, except in
certain nonrecognition transactions, as ordinary income to the extent of the
market discount that accrued during the period that such holder held such
Certificate. Further, a disposition of a Certificate by gift (and in certain
other circumstances) could result in the recognition of market discount income,
computed as if such Certificate had been sold for its fair market value.
 
    In the case of a partial principal payment on indebtedness subject to the
market discount rules, Section 1276 of the Code requires that such payment be
included in gross income as ordinary income to the extent such payment does not
exceed the market discount that has accrued during the period such indebtedness
was held. The amount of any accrued market discount later required to be
included in income upon a disposition, or subsequent partial principal payment,
will be reduced by the amount of accrued market discount previously included in
income.
 
    Until Treasury regulations are issued, the explanatory Conference Committee
Report to the Tax Reform Act of 1986 (the "Conference Report") indicates that
holders of installment obligations (such as the Equipment Notes) with market
discount may elect to accrue market discount either (i) on the basis of a
constant interest rate or (ii) in the ratio to the total amount of remaining
market discount that the amount of stated interest paid in the accrual period
bears to the total amount of stated interest remaining to be paid on the
installment obligation as of the beginning of such period. Under Section 1277 of
the Code, if in any taxable year interest paid or accrued on indebtedness
incurred or continued to purchase or carry indebtedness subject to the market
discount rules exceeds the interest currently includable in income with respect
to such indebtedness, deduction of the excess interest must be deferred to the
extent of the market
 
                                       24
<PAGE>
discount allocable to the taxable year. The deferred portion of any interest
expense will generally be deductible when such market discount is included in
income upon the sale or other disposition (including repayment) of the
indebtedness.
 
    A holder of a Certificate acquired at a market discount may elect under
Section 1278 of the Code, in the manner provided by Revenue Procedure 92-67,
1992-34 I.R.B. 6, to include such discount in income as it accrues. The current
inclusion election applies to all market discount obligations acquired on or
after the first day to which the election applies, and may not be revoked
without the consent of the IRS. If a holder of a Certificate elects to include
market discount in income as it accrues, the foregoing rules of Section 1276 and
1277 of the Code with respect to the recognition of ordinary income on a sale or
other disposition of such Certificate and the deferral of interest deductions on
indebtedness related to such Certificate would not apply.
 
    The IRS is authorized to issue regulations to implement the market discount
provisions of the Code. No such regulations have been issued or proposed. It is
impossible to anticipate what effect, if any, such regulations could have on the
Certificateholders.
 
AMORTIZABLE BOND PREMIUM
 
    A U.S. Certificate holder should generally be considered to have acquired an
interest in an Equipment Note at a premium to the extent the purchaser's tax
basis allocable to such interest exceeds the remaining principal amount of the
Equipment Note allocable to such interest. In that event, a U.S. Certificate
holder who holds a Certificate as a capital asset may elect to amortize that
premium as an offset to interest income under Section 171 of the Code with
corresponding reductions in the U.S. Certificate holder's tax basis in its
Certificate. In the case of installment obligations (such as the Equipment
Notes), the Conference Report indicates a Congressional intent that amortization
will be in accordance with the same rules that will apply to the accrual of
market discount on installment obligations (see discussion above).
 
    Under certain circumstances, amortizable bond premium may be determined by
reference to any early call date. It is unclear how the amortizable bond premium
rules apply where, as in the case with the Equipment Notes, the amount of
redemption premium payable on an early call date is unknown. In addition, the
treatment of any unamortized bond premium remaining at the time of an early call
is unclear. The U.S. Certificateholders are urged to consult their own tax
advisors as to the treatment of any amortizable bond premiums.
 
SALE OR OTHER DISPOSITION OF THE CERTIFICATES
 
    Upon the sale, exchange or other disposition of a Certificate, a U.S.
Certificate holder generally will recognize capital gain or loss equal to the
difference between the amount realized on the disposition (other than any amount
attributable to accrued interest which will be taxable as ordinary income) and
the U.S. Certificate holder's adjusted tax basis in the related Equipment Notes
and any other assets held by the corresponding Trust. A U.S. Certificate
holder's adjusted tax basis will equal the holder's cost for its Certificate,
plus any accrued OID or market discount previously included in income or less
any amortized bond premium or any previously recognized losses or prior
principal payments. Any gain or loss generally will be capital gain or loss
(other than accrued market discount not previously included in income) if the
Certificate was held as a capital asset.
 
FOREIGN CERTIFICATEHOLDERS
 
    Subject to the discussion of backup withholding below, payments of principal
and interest on the Equipment Notes to, or on behalf of, any beneficial owner of
a Certificate that is not a U.S. Person (a "Non-U.S. Certificate holder") will
not be subject to U.S. federal withholding tax; PROVIDED, in the case of
interest, that (i) such Non-U.S. Certificate holder does not actually or
constructively own 10% or more of
 
                                       25
<PAGE>
the total combined voting power of all classes of the stock of any Owner
Participant or any transferee of such interest, (ii) such Non-U.S. Certificate
holder is not a controlled foreign corporation for U.S. tax purposes that is
related to an Owner Participant and (iii) either (A) the Non-U.S. Certificate
holder certifies, under penalties of perjury, that it is not a U.S. Person and
provides its name and address or (B) a securities clearing organization, bank or
other financial institution that holds customers' securities in the ordinary
course of its trade or business (a "financial institution") and holds the
Certificate certifies, under penalties of perjury, that such statement has been
received from the Non-U.S. Certificate holder by it or by another financial
institution and furnishes the payor with a copy thereof.
 
    Any capital gain realized upon the sale, exchange, retirement or other
disposition of a Certificate or upon receipt of premium paid on an Equipment
Note by a Non-U.S. Certificate holder will not be subject to U.S. federal income
or withholding taxes if (i) such gain is not effectively connected with a U.S.
trade or business of the holder and (ii) in the case of an individual, such
holder is not present in the United States for 183 days or more in the taxable
year of the sale, exchange, retirement or other disposition or receipt.
 
BACKUP WITHHOLDING
 
    Payments made on the Certificates and proceeds from the sale of Certificates
will not be subject to a backup withholding tax of 31% unless, in general, the
Certificate holder fails to comply with certain reporting procedures or
otherwise fails to establish an exemption from such tax under applicable
provisions of the Code.
 
                              ERISA CONSIDERATIONS
 
    Unless otherwise indicated in the applicable Prospectus Supplement, the
Certificates may, subject to certain legal restrictions, be purchased and held
by an employee benefit plan (a "Plan") subject to Title I of the Employee
Retirement Income Security Act of 1974, as amended ("ERISA"), or an individual
retirement account or an employee benefit plan subject to section 4975 of the
Code. A fiduciary of a Plan must determine that the purchase and holding of a
Certificate is consistent with its fiduciary duties under ERISA and does not
result in a non-exempt prohibited transaction as defined in section 406 of ERISA
or section 4975 of the Code. Employee benefit plans which are governmental plans
(as defined in section 3(32) of ERISA) and certain church plans (as defined in
section 3(33) of ERISA) are not subject to Title I of ERISA or section 4975 of
the Code. The Certificates may, subject to certain legal restrictions, be
purchased and held by such plans.
 
                              PLAN OF DISTRIBUTION
 
    Certificates may be sold to one or more underwriters for public offering and
sale by them or to investors or other persons directly or through one or more
dealers or agents. Any such underwriter, dealer or agent involved in the offer
and sale of the Certificates will be named in an applicable Prospectus
Supplement.
 
    The Certificates may be sold at a fixed price or prices, which may be
changed, or from time to time at market prices prevailing at the time of sale,
at prices related to such prevailing market prices or at negotiated prices.
Dealer trading may take place in certain of the Certificates, including
Certificates not listed on any securities exchange. Northwest does not intend to
apply for listing of the Certificates on a national securities exchange.
Northwest also may, from time to time, authorize underwriters acting as
Northwest's agents to offer and sell the Certificates upon the terms and
conditions as shall be set forth in any Prospectus Supplement. In connection
with the sale of Certificates, underwriters may be deemed to have received
compensation from Northwest in the form of underwriting discounts or commissions
and may also receive commissions from purchasers of Certificates for whom they
may act as agent. Underwriters may sell Certificates to or through dealers, and
such dealers may receive compensation in the form of discounts, concessions or
commissions from the underwriters and/or commissions (which may be changed from
time to time) from the purchasers for whom they may act as agent.
 
                                       26
<PAGE>
    If a dealer is used directly by Northwest in the sale of Certificates in
respect of which this Prospectus is delivered, such Certificates will be sold to
the dealer, as principal. The dealer may then resell such Certificates to the
public at varying prices to be determined by such dealer at the time of resale.
Any such dealer and the terms of any such sale will be set forth in the
Prospectus Supplement relating thereto.
 
    Certificates may be offered and sold through agents designated by Northwest
from time to time. Any such agent involved in the offer or sale of the
Certificates in respect of which this Prospectus is delivered will be named in,
and any commissions payable by Northwest to such agent will be set forth in, the
applicable Prospectus Supplement. Unless otherwise indicated in the applicable
Prospectus Supplement, any such agent will be acting on a best efforts basis for
the period of its appointment.
 
    Offers to purchase Certificates may be solicited directly by Northwest and
sales thereof may be made by Northwest directly to institutional investors or
others who may be deemed to be underwriters within the meaning of the Securities
Act with respect to any resale thereof. The terms of any such sales will be
described in the Prospectus Supplement relating thereto. Except as set forth in
the applicable Prospectus Supplement, no director, officer or employee of
Northwest or NWA Corp. will solicit or receive a commission in connection with
direct sales by Northwest of the Certificates, although such persons may respond
to inquiries by potential purchasers and perform ministerial and clerical work
in connection with any such direct sales.
 
    Any underwriting compensation paid by Northwest to underwriters, dealers or
agents in connection with the offering of Certificates, and any discounts,
concessions or commissions allowed by underwriters to participating dealers,
will be set forth in an applicable Prospectus Supplement. Underwriters, dealers
and agents participating in the distribution of the Certificates may be deemed
to be underwriters, and any discounts and commissions received by them and any
profit realized by them on resale of the Certificates may be deemed to be
underwriting discounts and commissions under the Securities Act. Underwriters,
dealers and agents may be entitled, under agreements with Northwest, to
indemnification against and contribution toward certain civil liabilities,
including liabilities under the Securities Act, and to reimbursement by
Northwest for certain expenses.
 
    Underwriters, dealers and agents may engage in transactions with, or perform
services for, NWA Corp. and its subsidiaries in the ordinary course of business.
 
    If so indicated in an applicable Prospectus Supplement and subject to
existing market conditions, Northwest will authorize dealers acting as
Northwest's agents to solicit offers by certain institutions to purchase
Certificates at the public offering price set forth in such Prospectus
Supplement pursuant to Delayed Delivery Contracts ("Contracts") providing for
payment and delivery on the date or dates stated in such Prospectus Supplement.
Each Contract will be for an amount not less than, and the aggregate principal
amount of Certificates sold pursuant to Contracts shall not be less nor more
than, the respective amounts stated in such Prospectus Supplement. Institutions
with whom Contracts, when authorized, may be made include commercial and savings
banks, insurance companies, pension funds, investment companies, educational and
charitable institutions and other institutions, but will in all cases be subject
to the approval of Northwest. Contracts will not be subject to any conditions
except the purchase by an institution of the Certificates covered by its
Contracts shall not at the time of delivery be prohibited under the laws of any
jurisdiction in the United States to which such institution is subject. A
commission indicated in the applicable Prospectus Supplement will be granted to
underwriters and agents soliciting purchases of Certificates pursuant to
Contracts accepted by Northwest. Agents and underwriters will have no
responsibility in respect of the delivery or performance of Contracts.
 
    If an underwriter or underwriters are utilized in the sale of any
Certificates, the applicable Prospectus Supplement will contain a statement as
to the intention, if any, of such underwriters at the date of such Prospectus
Supplement to make a market in the Certificates. No assurances can be given that
there will be a market for the Certificates.
 
                                       27
<PAGE>
    The place and time of delivery for the Certificates in respect of which this
Prospectus is delivered will be set forth in the applicable Prospectus
Supplement.
 
                                 LEGAL OPINIONS
 
    Unless otherwise indicated in the applicable Prospectus Supplement, the
validity of the Certificates and the Parent Guaranty will be passed upon for
Northwest by Simpson Thacher & Bartlett (a partnership which includes
professional corporations), New York, New York. Unless otherwise indicated in
the applicable Prospectus Supplement, Simpson Thacher & Bartlett will rely on
the opinion of counsel for the Trustee as to certain matters relating to the
authorization, execution and delivery of such Certificates by, and the valid and
binding effect thereof on, such Trustee. Certain federal income tax matters will
be passed upon by Cadwalader, Wickersham & Taft, New York, New York, special tax
counsel to Northwest.
 
                                    EXPERTS
 
    The consolidated financial statements and schedule of Northwest Airlines
Corporation, appearing or incorporated by reference in Northwest Airlines
Corporation's Annual Report (Form 10-K) for the year ended December 31, 1995,
have been audited by Ernst & Young LLP, independent auditors, as set forth in
their report thereon included or incorporated by reference therein and
incorporated herein by reference. Such consolidated financial statements and
schedule are incorporated herein by reference in reliance upon such report given
upon the authority of such firm as experts in accounting and auditing.
 
                                       28
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS OR ANY RELATED PROSPECTUS
SUPPLEMENT IN CONNECTION WITH THE OFFER CONTAINED IN THIS PROSPECTUS AND SUCH
PROSPECTUS SUPPLEMENT AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY NORTHWEST, NWA CORP. OR ANY
UNDERWRITERS, AGENTS OR DEALERS. THIS PROSPECTUS AND ANY RELATED PROSPECTUS
SUPPLEMENT DO NOT CONSTITUTE AN OFFER TO SELL OR SOLICITATION OF AN OFFER TO BUY
SECURITIES IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH
OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS AND ANY RELATED
PROSPECTUS SUPPLEMENT NOR ANY SALE MADE HEREUNDER OR THEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF NORTHWEST OR NWA CORP. SINCE THE DATE HEREOF OR THEREOF OR THAT THE
INFORMATION CONTAINED HEREIN OR THEREIN IS CORRECT AT ANY TIME SUBSEQUENT TO THE
DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Available Information.....................................................    3
Incorporation of Certain Documents by Reference...........................    3
The Company...............................................................    4
General Outline of Trust Structure........................................    4
Use of Proceeds...........................................................    5
Ratio of Earnings to Fixed Charges........................................    6
Description of the Certificates...........................................    6
Description of the Equipment Notes........................................   18
United States Federal Income Tax Consequences.............................   23
ERISA Considerations......................................................   27
Plan of Distribution......................................................   27
Legal Opinions............................................................   29
Experts...................................................................   29
</TABLE>
 
                                  $500,000,000
 
                                   NORTHWEST
                                 AIRLINES, INC.
 
                           PASS THROUGH CERTIFICATES
 
                               ------------------
 
                         APPLICABLE UNDERLYING PAYMENTS
                    FULLY AND UNCONDITIONALLY GUARANTEED BY
 
                               NORTHWEST AIRLINES
                                  CORPORATION
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
                                          , 1996
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
    The estimated expenses in connection with the issuance and distribution of
the securities being registered, other than underwriting discounts and
commissions, are set forth in the following table.
 
<TABLE>
<S>                                                           <C>
Securities and Exchange Commission fee......................  $  83,182
Printing and engraving expenses.............................    100,000*
Accountants' fees and expenses..............................     25,000*
Legal fees and expenses.....................................    200,000*
Blue Sky fees and expenses..................................     20,000*
Trustees' fees and expenses.................................     10,000*
Rating Agency fees..........................................    170,000*
Miscellaneous...............................................     91,818*
                                                              ---------
    Total...................................................  $ 700,000*
                                                              ---------
                                                              ---------
</TABLE>
 
- ------------------------
 
*Estimated and subject to future contingencies.
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    Section 302A.521 of the Minnesota Business Corporation Act (the "Minnesota
Law") requires a Minnesota corporation to indemnify a person made or threatened
to be made a party to a proceeding by reason of the former or present official
capacity of the person against judgments, penalties, fines and reasonable
expenses (including attorneys' fees), provided that the person has not otherwise
been indemnified, was acting in good faith, received no improper personal
benefit as a result of the conduct in question, in the case of a criminal
proceeding, had no reasonable cause to believe the conduct was unlawful and,
depending upon the capacity in which such person was acting, believed that the
conduct was in the best interests of the corporation or was not considered to be
opposed to the best interests of the corporation. Under Minnesota Law, the
termination of a proceeding by judgment, order, settlement, conviction or upon a
pleading of NOLO CONTENDERE or its equivalent does not, of itself, establish
that a person is not eligible for indemnification. Minnesota corporations are
permitted to include provisions in their bylaws or articles of incorporation
that prohibit or limit indemnification otherwise required by Minnesota law.
 
    Section 7 of Northwest's bylaws (filed as Exhibit 3.4) requires Northwest to
indemnify any persons, including officers and directors as permitted by Section
302A.521 of the Minnesota Law. In addition, Section 7 also specifies that
Northwest shall indemnify its officers and directors against all costs and
expenses incurred in connection with or arising out of any action, suit or
proceeding in which such officer or director may be involved as a result of
being or having been a director or officer of Northwest. However, Section 7
prohibits indemnification when an action, suit or proceeding results in an
officer or director being adjudicated derelict in the performance of his or her
duties as an officer or director, or when a settlement or compromise is effected
when the total cost of such settlement substantially exceeds the expense which
might reasonably be incurred in litigating the matter to a final conclusion.
 
    Section 145 of the General Corporation Law of the State of Delaware (the
"Delaware Law") empowers a Delaware corporation to indemnify any persons who
are, or are threatened to be made, parties to any threatened, pending or
completed legal action, suit or proceeding, whether civil, criminal,
administrative or investigative (other than an action by or in the right of such
corporation), by reason of the fact that such person is or was an officer,
director, employee or agent of such corporation, or is or was serving at the
request of such corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise. The
indemnity may include expenses (including
 
                                      II-1
<PAGE>
attorneys' fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by such person in connection with such action, suit or
proceeding, provided that such officer, director, employee or agent acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
corporation's best interests, and, for criminal proceedings, had no reasonable
cause to believe his conduct was unlawful. A Delaware corporation may indemnify
officers and directors in an action by or in the right of the corporation under
the same conditions, except that no indemnification is permitted without
judicial approval if the officer or director is adjudged to be liable to the
corporation. Where an officer or director is successful on the merits or
otherwise in the defense of any action referred to above, the corporation must
indemnify him against the expenses which such officer or director actually and
reasonably incurred.
 
    In accordance with Section 102(b)(7) of the Delaware Law, the Second Amended
and Restated Certificate of Incorporation of Northwest Airlines Corporation
("NWA Corp.") provides that the directors of NWA Corp. shall not be personally
liable to NWA Corp. or its stockholders for monetary damages for violations of
their fiduciary duty.
 
    Article VIII of the bylaws, as amended, of NWA Corp. (filed as Exhibit 4(r))
provides for indemnification of the officers and directors of NWA Corp. to the
full extent permitted by applicable law.
 
ITEM 16. EXHIBITS
 
    The following Exhibits are filed as part of this Registration Statement:
 
<TABLE>
<S>            <C>
Exhibit 1(a)   Form of Purchase Agreement for Debt Securities of Northwest Airlines,
               Inc. ("Northwest") (filed as Exhibit 1(a) to the Registration Statement
               on Form S-3 (file No. 33-74772) (the "S-3") and incorporated herein by
               reference).
 
Exhibit 1(b)   Form of Underwriting Agreement for Pass Through Certificates of Northwest
               (filed as Exhibit 1(b) to the S-3 and incorporated herein by reference).
 
Exhibit 1(c)   Form of Purchase Agreement for Convertible Debt Securities of NWA Corp.
               (filed as Exhibit 1(c) to the S-3 and incorporated herein by reference).
 
Exhibit 1(d)   Form of Purchase Agreement for Equity Securities of NWA Corp. (filed as
               Exhibit 1(d) to the S-3 and incorporated herein by reference).
 
Exhibit 4(a)   Form of Senior Debt Securities Indenture among Northwest, NWA Corp. and
               State Street Bank & Trust Company, successor to The First National Bank
               of Boston (as such successor, "State Street"), as Trustee, relating to
               the Senior Debt Securities of Northwest (filed as Exhibit 4(a) to the S-3
               and incorporated herein by reference).
 
Exhibit 4(b)   Form of Senior Subordinated Debt Securities Indenture among Northwest,
               NWA Corp. and State Street, as Trustee, relating to the Senior
               Subordinated Debt Securities of Northwest (filed as Exhibit 4(b) to the
               S-3 and incorporated herein by reference).
 
Exhibit 4(c)   Form of Senior Debt Securities of Northwest (included in Exhibit 4(a)).
 
Exhibit 4(d)   Form of Senior Subordinated Debt Securities of Northwest (included in
               Exhibit 4(b)).
 
Exhibit 4(e)   Form of Convertible Senior Debt Securities Indenture between NWA Corp.
               and State Street, as Trustee, relating to the Convertible Senior Debt
               Securities of NWA Corp. (filed as Exhibit 4(e) to the S-3 and
               incorporated herein by reference).
 
Exhibit 4(f)   Form of Convertible Subordinated Debt Securities Indenture between NWA
               Corp. and State Street, as Trustee, relating to the Convertible
               Subordinated Debt Securities of NWA Corp. (filed as Exhibit 4(f) to the
               S-3 and incorporated herein by reference).
</TABLE>
 
                                      II-2
<PAGE>
<TABLE>
<S>            <C>
Exhibit 4(g)   Form of Warrant Agreement for Warrants to Purchase Debt Securities of
               Northwest that are Sold Attached to Debt Securities of Northwest (filed
               as Exhibit 4(g) to the S-3 and incorporated herein by reference).
 
Exhibit 4(h)   Form of Warrant to Purchase Debt Securities of Northwest that are Sold
               Attached to Debt Securities of Northwest (included as part of Exhibit
               4(g)).
 
Exhibit 4(i)   Form of Warrant Agreement for Warrants to Purchase Debt Securities of
               Northwest that are Sold Alone (filed as Exhibit 4(i) to the S-3 and
               incorporated herein by reference).
 
Exhibit 4(j)   Form of Warrant to Purchase Debt Securities of Northwest that are Sold
               Alone (included as part of Exhibit 4(i)).
 
Exhibit 4(k)   Form of Warrant Agreement for Warrants to Purchase Class A Common Stock
               of NWA Corp. (filed as Exhibit 4(k) to the S-3 and incorporated herein by
               reference).
 
Exhibit 4(l)   Form of Warrant to Purchase Class A Common Stock of NWA Corp. (included
               as part of Exhibit 4(k)).
 
Exhibit 4(m)   Specimen Certificate for Class A Common Stock of NWA Corp. (filed as
               Exhibit 4(m) to the S-3 and incorporated herein by reference).
 
Exhibit 4(n)   Form of Pass Through Trust Agreement among NWA Corp., Northwest and State
               Street Bank & Trust Company, as Trustee, relating to Pass Through
               Certificates of Northwest (filed as Exhibit 4(n) to the Registration
               Statement on Form S-3 (File No. 333-2516) and incorporated herein by
               reference).
 
Exhibit 4(o)   Form of Pass Through Certificate (included as part of Exhibit 4(n)).
 
Exhibit 4(p)   Second Amended and Restated Certificate of Incorporation of NWA Corp.
               (filed as Exhibit 3.1 to NWA Corp.'s Registration Statement on Form S-1,
               File No. 33-74210 (the "S-1") and incorporated herein by reference).
 
Exhibit 4(q)   Certificate of Amendment to the Second Amended and Restated Certificate
               of Incorporation of NWA Corp. (filed as Exhibit 3.3 to the S-1 and
               incorporated herein by reference).
 
Exhibit 4(r)   Amended and Restated By-Laws of NWA Corp. (filed as Exhibit 3.2 to the
               S-1 and incorporated herein by reference).
 
Exhibit 4(s)   Restated Certificate of Incorporation of Northwest (filed as Exhibit 4(s)
               to the S-3 and incorporated herein by reference).
 
Exhibit 4(t)   Bylaws of Northwest (filed as Exhibit 4(t) to the Registration Statement
               on Form S-3 (File No. 333-2516) and incorporated herein by reference).
 
Exhibit 4(u)   Amended and Restated Certificate of Designation of Series A Preferred
               Stock of NWA Corp. (included in Exhibit 4(p)).
 
Exhibit 4(v)   Amended and Restated Certificate of Designation of Series B Preferred
               Stock of NWA Corp. (included in Exhibit 4(p)).
 
Exhibit 4(w)   Certificate of Designation of Series C Preferred Stock of NWA Corp.
               (included in Exhibit 4(p)).
 
Exhibit 4(x)   Certificate of Designation of Series D Junior Participating Preferred
               Stock of NWA Corp. (filed as Exhibit A to Exhibit 1 to NWA Corps.'s
               Current Report on Form 8-K dated November 16, 1995 and incorporated
               herein by reference).
</TABLE>
 
                                      II-3
<PAGE>
<TABLE>
<S>            <C>
Exhibit 4(y)   The Registrants hereby agree to furnish to the Commission, upon request,
               copies of certain instruments defining the rights of holders of long-term
               debt of the kind described in Item 601(b)(4) of Regulation S-K.
 
Exhibit 5      Opinion of Simpson Thacher & Bartlett as to the legality of the
               Securities.*
 
Exhibit 8      Tax Opinion of Cadwalader, Wickersham & Taft relating to Pass Through
               Certificates.*
 
Exhibit 12(a)  Computation of Ratio of Earnings to Fixed Charges of NWA Corp
               (incorporated herein by reference to NWA Corp.'s Quarterly Report on Form
               10-Q for the quarter ended June 30, 1996).
 
Exhibit 12(b)  Computation of Ratio of Earnings to Fixed Charges and Preferred Stock
               Dividend Requirements of NWA Corp (incorporated herein by reference to
               NWA Corp.'s Quarterly Report on Form 10-Q for the quarter ended June 30,
               1996).
 
Exhibit 23(a)  Consent of Ernst & Young LLP.
 
Exhibit 23(b)  Consent of Simpson Thacher & Bartlett (included as part of Exhibit 5).
 
Exhibit 23(c)  Consent of Cadwalader, Wickersham & Taft (included as part of Exhibit 8).
 
Exhibit 24     Powers of Attorney (included in signature pages II-6 and II-8 of
               registration statement as initially filed).
 
Exhibit 25     Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939,
               as amended, of State Street, as Trustee under the Convertible Senior Debt
               Securities Indenture of NWA Corp., the Convertible Subordinated Debt
               Securities Indenture of NWA Corp., the Senior Debt Securities Indenture
               of Northwest and NWA Corp., the Senior Subordinated Debt Securities
               Indenture of Northwest and NWA Corp. and the Pass Through Trust Agreement
               of NWA Corp. and Northwest (filed as Exhibit 26 to the S-3 and
               incorporated herein by reference).
</TABLE>
 
- ------------------------
 
*   To be filed by amendment.
 
ITEM 17. UNDERTAKINGS
 
    (a) Each of the undersigned registrants hereby undertakes:
 
        (1) To file, during any period in which offers or sales are being made,
    a post-effective amendment to this Registration Statement:
 
            (i) To include any prospectus required by Section 10(a)(3) of the
       Securities Act;
 
            (ii) To reflect in the prospectus any facts or events arising after
       the effective date of the Registration Statement (or the most recent
       post-effective amendment thereof) which, individually or in the
       aggregate, represent a fundamental change in the information set forth in
       the Registration Statement. Notwithstanding the foregoing, any increase
       or decrease in volume of securities offered (if the total dollar value of
       securities offered would not exceed that which was registered) and any
       deviation from the low or high end of the estimated maximum offering
       range may be reflected in the form of prospectus filed with the
       Commission pursuant to Rule 424(b) if, in the aggregate, the changes in
       volume and price represent no more than a 20% change in the maximum
       aggregate offering price set forth in the "Calculation of Registration
       Fee" table in the effective Registration Statement; and
 
                                      II-4
<PAGE>
           (iii) To include any material information with respect to the plan of
       distribution not previously disclosed in the Registration Statement or
       any material change to such information in the Registration Statement;
 
    PROVIDED, HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if
    the Registration Statement is on Form S-3, Form S-8 or Form F-3, and the
    information required to be included in a post-effective amendment by those
    paragraphs is contained in periodic reports filed with or furnished to the
    Commission by NWA Corp. pursuant to Section 13 or Section 15(d) of the
    Exchange Act that are incorporated by reference in the Registration
    Statement.
 
        (2) That, for the purpose of determining any liability under the
    Securities Act, each such post-effective amendment shall be deemed to be a
    new registration statement relating to the securities offered therein, and
    the offering of such securities at that time shall be deemed to be the
    initial bona fide offering thereof.
 
        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.
 
    (b) Each of the undersigned registrants hereby undertakes that, for purposes
of determining any liability under the Securities Act, each filing of NWA
Corp.'s annual report pursuant to Section 13(a) or Section 15(d) of the Exchange
Act (and, where applicable, each filing of an employee benefit plan's annual
report pursuant to Section 15(d) of the Exchange Act) that is incorporated by
reference in the Registration Statement shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
    (c) Each of the undersigned registrants hereby undertakes if securities are
to be offered pursuant to competitive bidding (1) to use its best efforts to
distribute prior to the opening of bids, to prospective bidders, underwriters
and dealers, a reasonable number of copies of a prospectus which at that time
meets the requirements of section 10(a) of the Securities Act, and relating to
the securities offered at competitive bidding, as contained in this Registration
Statement, together with any supplements thereto, and (2) to file an amendment
to this Registration Statement reflecting the results of bidding, the terms of
the reoffering and related matters to the extent required by the applicable
form, not later than the first use, authorized by the issuer after the opening
of bids, of a prospectus relating to the securities offered at competitive
bidding, unless no further public offering of such securities by the issuer and
no reoffering of such securities by purchasers is proposed to be made.
 
    (d) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
registrants pursuant to the foregoing provisions, or otherwise, the registrants
have been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the Securities Act, and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by a registrant of expenses incurred or paid
by a director, officer or controlling person of such registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the applicable registrant will, unless in the opinion of its counsel
the matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.
 
    (e) Each of the undersigned registrants hereby undertakes to file an
application for the purpose of determining the eligibility of the trustee to act
under subsection (a) of Section 310 of the Trust Indenture Act in accordance
with the rules and regulations prescribed by the Commission under Section
305(b)(2) of the Trust Indenture Act.
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, NORTHWEST
AIRLINES, INC. HAS DULY CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS
BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED IN THE CITY OF MINNEAPOLIS,
STATE OF MINNESOTA, ON OCTOBER 2, 1996.
 
                                NORTHWEST AIRLINES, INC.
 
                                By:           /s/ DOUGLAS M. STEENLAND
                                     ------------------------------------------
                                                Douglas M. Steenland
                                               SENIOR VICE PRESIDENT,
                                            GENERAL COUNSEL AND SECRETARY
 
    KNOW ALL MEN BY THESE PRESENTS, that each individual whose signature appears
below hereby constitutes and appoints Douglas M. Steenland and Joseph E.
Francht, Jr., and each of them individually, his true and lawful agent, proxy
and attorney-in-fact, with full power of substitution and resubstitution, for
him and in his name, place and stead, in any and all capacities, to (i) act on,
sign and file with the Securities and Exchange Commission any and all amendments
(including post-effective amendments) to this Registration Statement together
with all schedules and exhibits thereto, (ii) act on, sign and file with the
Securities and Exchange Commission any registration statement relating to this
offering that is to be effective upon filing pursuant to Rule 462(b) under the
Securities Act of 1933, as amended, (iii) act on, sign and file with the
Securities and Exchange Commission any exhibits to this Registration Statement
or any such registration statement or amendments (including post-effective
amendments), (iv) act on, sign and file such certificates, instruments,
agreements and other documents as may be necessary or appropriate in connection
therewith, (v) act on and file any supplement to any prospectus included in this
Registration Statement or any such registration statement or amendment and (vi)
take any and all actions which may be necessary or appropriate in connection
therewith, granting unto such agents, proxies and attorneys-in-fact, and each of
them individually, full power and authority to do and perform each and every act
and thing necessary or appropriate to be done, as fully for all intents and
purposes as he might or could do in person, hereby approving, ratifying and
confirming all that such agents, proxies and attorneys-in-fact, any of them or
any of his or their substitute or substitutes may lawfully do or cause to be
done by virtue hereof.
 
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED.
 
<TABLE>
<CAPTION>
                 SIGNATURE                                       TITLE                               DATE
- --------------------------------------------  --------------------------------------------  ----------------------
 
<C>                                           <S>                                           <C>
            /s/ JOHN H. DASBURG               President, Chief Executive Officer and
     ----------------------------------        Director (Principal Executive Officer)       October 2, 1996
              John H. Dasburg
 
         /s/ JOSEPH E. FRANCHT, JR.           Senior Vice President--Finance and Treasurer
     ----------------------------------        (Principal Financial Officer)                October 2, 1996
           Joseph E. Francht, Jr.
 
            /s/ ROLF S. ANDRESEN              Vice President--Finance and Controller
     ----------------------------------        (Principal Financial Officer)                October 2, 1996
              Rolf S. Andresen
 
           /s/ MARK W. OSTERBERG              Vice President and Chief Accounting Officer
     ----------------------------------        (Principal Accounting Officer)               October 2, 1996
             Mark W. Osterberg
</TABLE>
 
                                      II-6
<PAGE>
<TABLE>
<CAPTION>
                 SIGNATURE                                       TITLE                               DATE
- --------------------------------------------  --------------------------------------------  ----------------------
 
<C>                                           <S>                                           <C>
           /s/ ALFRED A. CHECCHI
     ----------------------------------       Co-Chairman of the Board of Directors         October 2, 1996
             Alfred A. Checchi
 
             /s/ GARY L. WILSON
     ----------------------------------       Co-Chairman of the Board of Directors         October 2, 1996
               Gary L. Wilson
 
            /s/ RICHARD C. BLUM
     ----------------------------------       Director                                      October 2, 1996
              Richard C. Blum
 
              /s/ THOMAS DUCY
     ----------------------------------       Director                                      October 2, 1996
                Thomas Ducy
 
           /s/ MARVIN L. GRISWOLD
     ----------------------------------       Director                                      October 2, 1996
             Marvin L. Griswold
 
     ----------------------------------       Director                                      October 2, 1996
             Thomas L. Kempner
 
           /s/ FREDERIC V. MALEK
     ----------------------------------       Director                                      October 2, 1996
             Frederic V. Malek
 
             /s/ V.A. RAVINDRAN
     ----------------------------------       Director                                      October 2, 1996
               V.A. Ravindran
 
            /s/ GEORGE J. VOJTA
     ----------------------------------       Director                                      October 2, 1996
              George J. Vojta
 
            /s/ DUANE E. WOERTH
     ----------------------------------       Director                                      October 2, 1996
              Duane E. Woerth
</TABLE>
 
                                      II-7
<PAGE>
                                   SIGNATURES
 
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, NORTHWEST
AIRLINES CORPORATION HAS DULY CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON
ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED IN THE CITY OF
MINNEAPOLIS, STATE OF MINNESOTA, ON OCTOBER 2, 1996.
 
                                NORTHWEST AIRLINES CORPORATION
 
                                By:           /s/ DOUGLAS M. STEENLAND
                                     ------------------------------------------
                                                Douglas M. Steenland
                                               SENIOR VICE PRESIDENT,
                                            GENERAL COUNSEL AND SECRETARY
 
    KNOW ALL MEN BY THESE PRESENTS, that each individual whose signature appears
below hereby constitutes and appoints Douglas M. Steenland and Joseph E.
Francht, Jr., and each of them individually, his true and lawful agent, proxy
and attorney-in-fact, with full power of substitution and resubstitution, for
him and in his name, place and stead, in any and all capacities, to (i) act on,
sign and file with the Securities and Exchange Commission any and all amendments
(including post-effective amendments) to this Registration Statement together
with all schedules and exhibits thereto, (ii) act on, sign and file with the
Securities and Exchange Commission any registration statement relating to this
offering that is to be effective upon filing pursuant to Rule 462(b) under the
Securities Act of 1933, as amended, (iii) act on, sign and file with the
Securities and Exchange Commission any exhibits to this Registration Statement
or any such registration statement or amendments (including post-effective
amendments), (iv) act on, sign and file such certificates, instruments,
agreements and other documents as may be necessary or appropriate in connection
therewith, (v) act on and file any supplement to any prospectus included in this
Registration Statement or any such registration statement or amendment and (vi)
take any and all actions which may be necessary or appropriate in connection
therewith, granting unto such agents, proxies and attorneys-in-fact, and each of
them individually, full power and authority to do and perform each and every act
and thing necessary or appropriate to be done, as fully for all intents and
purposes as he might or could do in person, hereby approving, ratifying and
confirming all that such agents, proxies and attorneys-in-fact, any of them or
any of his or their substitute or substitutes may lawfully do or cause to be
done by virtue hereof.
 
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED.
 
<TABLE>
<CAPTION>
                 SIGNATURE                                       TITLE                               DATE
- --------------------------------------------  --------------------------------------------  ----------------------
 
<C>                                           <S>                                           <C>
            /s/ JOHN H. DASBURG               President, Chief Executive Officer and
     ----------------------------------        Director (Principal Executive Officer)       October 2, 1996
              John H. Dasburg
 
         /s/ JOSEPH E. FRANCHT, JR.           Senior Vice President--Finance and Treasurer
     ----------------------------------        (Principal Financial Officer)                October 2, 1996
           Joseph E. Francht, Jr.
 
            /s/ ROLF S. ANDRESEN              Vice President--Finance and Controller
     ----------------------------------        (Principal Financial Officer)                October 2, 1996
              Rolf S. Andresen
 
           /s/ MARK W. OSTERBERG              Vice President and Chief Accounting Officer
     ----------------------------------        (Principal Accounting Officer)               October 2, 1996
             Mark W. Osterberg
</TABLE>
 
                                      II-8
<PAGE>
<TABLE>
<CAPTION>
                 SIGNATURE                                       TITLE                               DATE
- --------------------------------------------  --------------------------------------------  ----------------------
 
<C>                                           <S>                                           <C>
           /s/ ALFRED A. CHECCHI
     ----------------------------------       Co-Chairman of the Board of Directors         October 2, 1996
             Alfred A. Checchi
 
             /s/ GARY L. WILSON
     ----------------------------------       Co-Chairman of the Board of Directors         October 2, 1996
               Gary L. Wilson
 
            /s/ RICHARD C. BLUM
     ----------------------------------       Director                                      October 2, 1996
              Richard C. Blum
 
              /s/ THOMAS DUCY
     ----------------------------------       Director                                      October 2, 1996
                Thomas Ducy
 
           /s/ MARVIN L. GRISWOLD
     ----------------------------------       Director                                      October 2, 1996
             Marvin L. Griswold
 
     ----------------------------------       Director                                      October 2, 1996
             Thomas L. Kempner
 
           /s/ FREDERIC V. MALEK
     ----------------------------------       Director                                      October 2, 1996
             Frederic V. Malek
 
             /s/ V.A. RAVINDRAN
     ----------------------------------       Director                                      October 2, 1996
               V.A. Ravindran
 
            /s/ GEORGE J. VOJTA
     ----------------------------------       Director                                      October 2, 1996
              George J. Vojta
 
            /s/ DUANE E. WOERTH
     ----------------------------------       Director                                      October 2, 1996
              Duane E. Woerth
</TABLE>
 
                                      II-9
<PAGE>
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
                                                                                                         SEQUENTIALLY
    EXHIBIT                                                                                                NUMBERED
     NUMBER                                           DESCRIPTION                                            PAGE
- ----------------  -----------------------------------------------------------------------------------  -----------------
<S>               <C>                                                                                  <C>
Exhibit 1(a)      Form of Purchase Agreement for Debt Securities of Northwest Airlines, Inc.
                  ("Northwest") (filed as Exhibit 1(a) to the Registration Statement on Form S-3
                  (file No. 33-74772) (the "S-3") and incorporated herein by reference).
 
Exhibit 1(b)      Form of Underwriting Agreement for Pass Through Certificates of Northwest (filed as
                  Exhibit 1(b) to the S-3 and incorporated herein by reference).
 
Exhibit 1(c)      Form of Purchase Agreement for Convertible Debt Securities of NWA Corp. (filed as
                  Exhibit 1(c) to the S-3 and incorporated herein by reference).
 
Exhibit 1(d)      Form of Purchase Agreement for Equity Securities of NWA Corp. (filed as Exhibit
                  1(d) to the S-3 and incorporated herein by reference).
 
Exhibit 4(a)      Form of Senior Debt Securities Indenture among Northwest, NWA Corp. and State
                  Street Bank & Trust Company, successor to The First National Bank of Boston (as
                  such successor, "State Street"), as Trustee, relating to the Senior Debt Securities
                  of Northwest (filed as Exhibit 4(a) to the S-3 and incorporated herein by
                  reference).
 
Exhibit 4(b)      Form of Senior Subordinated Debt Securities Indenture among Northwest, NWA Corp.
                  and State Street, as Trustee, relating to the Senior Subordinated Debt Securities
                  of Northwest (filed as Exhibit 4(b) to the S-3 and incorporated herein by
                  reference).
 
Exhibit 4(c)      Form of Senior Debt Securities of Northwest (included in Exhibit 4(a)).
 
Exhibit 4(d)      Form of Senior Subordinated Debt Securities of Northwest (included in Exhibit
                  4(b)).
 
Exhibit 4(e)      Form of Convertible Senior Debt Securities Indenture between NWA Corp. and State
                  Street, as Trustee, relating to the Convertible Senior Debt Securities of NWA Corp.
                  (filed as Exhibit 4(e) to the S-3 and incorporated herein by reference).
 
Exhibit 4(f)      Form of Convertible Subordinated Debt Securities Indenture between NWA Corp. and
                  State Street, as Trustee, relating to the Convertible Subordinated Debt Securities
                  of NWA Corp. (filed as Exhibit 4(f) to the S-3 and incorporated herein by
                  reference).
 
Exhibit 4(g)      Form of Warrant Agreement for Warrants to Purchase Debt Securities of Northwest
                  that are Sold Attached to Debt Securities of Northwest (filed as Exhibit 4(g) to
                  the S-3 and incorporated herein by reference).
 
Exhibit 4(h)      Form of Warrant to Purchase Debt Securities of Northwest that are Sold Attached to
                  Debt Securities of Northwest (included as part of Exhibit 4(g)).
 
Exhibit 4(i)      Form of Warrant Agreement for Warrants to Purchase Debt Securities of Northwest
                  that are Sold Alone (filed as Exhibit 4(i) to the S-3 and incorporated herein by
                  reference).
</TABLE>
 
                                     II-10
<PAGE>
<TABLE>
<CAPTION>
                                                                                                         SEQUENTIALLY
    EXHIBIT                                                                                                NUMBERED
     NUMBER                                           DESCRIPTION                                            PAGE
- ----------------  -----------------------------------------------------------------------------------  -----------------
Exhibit 4(j)      Form of Warrant to Purchase Debt Securities of Northwest that are Sold Alone
                  (included as part of Exhibit 4(i)).
<S>               <C>                                                                                  <C>
 
Exhibit 4(k)      Form of Warrant Agreement for Warrants to Purchase Class A Common Stock of NWA
                  Corp. (filed as Exhibit 4(k) to the S-3 and incorporated herein by reference).
 
Exhibit 4(l)      Form of Warrant to Purchase Class A Common Stock of NWA Corp. (included as part of
                  Exhibit 4(k)).
 
Exhibit 4(m)      Specimen Certificate for Class A Common Stock of NWA Corp. (filed as Exhibit 4(m)
                  to the S-3 and incorporated herein by reference).
 
Exhibit 4(n)      Form of Pass Through Trust Agreement among NWA Corp., Northwest and State Street
                  Bank & Trust Company, as Trustee, relating to Pass Through Certificates of
                  Northwest (filed as Exhibit 4(n) to the to the Registration Statement on Form S-3
                  (File No. 333-2516) and incorporated herein by reference).
 
Exhibit 4(o)      Form of Pass Through Certificate (included as part of Exhibit 4(n)).
 
Exhibit 4(p)      Second Amended and Restated Certificate of Incorporation of NWA Corp. (filed as
                  Exhibit 3.1 to NWA Corp.'s Registration Statement on Form S-1, File No. 33-74210
                  (the "S-1") and incorporated herein by reference).
 
Exhibit 4(q)      Certificate of Amendment to the Second Amended and Restated Certificate of
                  Incorporation of NWA Corp. (filed as Exhibit 3.3 to the S-1 and incorporated herein
                  by reference).
 
Exhibit 4(r)      Amended and Restated By-Laws of NWA Corp. (filed as Exhibit 3.2 to the S-1 and
                  incorporated herein by reference).
 
Exhibit 4(s)      Restated Certificate of Incorporation of Northwest (filed as Exhibit 4(s) to the
                  S-3 and incorporated herein by reference).
 
Exhibit 4(t)      Bylaws of Northwest (filed as Exhibit 4(t) to the Registration Statement on Form
                  S-3 (File No. 333-2516) and incorporated herein by reference).
 
Exhibit 4(u)      Amended and Restated Certificate of Designation of Series A Preferred Stock of NWA
                  Corp. (included in Exhibit 4(p)).
 
Exhibit 4(v)      Amended and Restated Certificate of Designation of Series B Preferred Stock of NWA
                  Corp. (included in Exhibit 4(p)).
 
Exhibit 4(w)      Certificate of Designation of Series C Preferred Stock of NWA Corp. (included in
                  Exhibit 4(p)).
 
Exhibit 4(x)      Certificate of Designation of Series D Junior Participating Preferred Stock of NWA
                  Corp. (filed as Exhibit A to Exhibit 1 to NWA Corps.'s Current Report on Form 8-K
                  dated November 16, 1995 and incorporated herein by reference).
 
Exhibit 4(y)      The Registrants hereby agree to furnish to the Commission, upon request, copies of
                  certain instruments defining the rights of holders of long-term debt of the kind
                  described in Item 601(b)(4) of Regulation S-K.
</TABLE>
 
                                     II-11
<PAGE>
<TABLE>
<CAPTION>
                                                                                                         SEQUENTIALLY
    EXHIBIT                                                                                                NUMBERED
     NUMBER                                           DESCRIPTION                                            PAGE
- ----------------  -----------------------------------------------------------------------------------  -----------------
Exhibit 5         Opinion of Simpson Thacher & Bartlett as to the legality of the Securities.*
<S>               <C>                                                                                  <C>
 
Exhibit 8         Tax Opinion of Cadwalader, Wickersham & Taft relating to Pass Through
                  Certificates.*
 
Exhibit 12(a)     Computation of Ratio of Earnings to Fixed Charges of NWA Corp (incorporated herein
                  by reference to NWA Corp.'s Quarterly Report on Form 10-Q for the quarter ended
                  June 30, 1996).
 
Exhibit 12(b)     Computation of Ratio of Earnings to Fixed Charges and Preferred Stock Dividend
                  Requirements of NWA Corp (incorporated herein by reference to NWA Corp.'s Quarterly
                  Report on Form 10-Q for the quarter ended June 30, 1996).
 
Exhibit 23(a)     Consent of Ernst & Young LLP.
 
Exhibit 23(b)     Consent of Simpson Thacher & Bartlett (included as part of Exhibit 5).
 
Exhibit 23(c)     Consent of Cadwalader, Wickersham & Taft (included as part of Exhibit 8).
 
Exhibit 24        Powers of Attorney (included in signature pages II-6 and II-8 of registration
                  statement as initially filed).
 
Exhibit 25        Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as
                  amended, of State Street, as Trustee under the Convertible Senior Debt Securities
                  Indenture of NWA Corp., the Convertible Subordinated Debt Securities Indenture of
                  NWA Corp., the Senior Debt Securities Indenture of Northwest and NWA Corp., the
                  Senior Subordinated Debt Securities Indenture of Northwest and NWA Corp. and the
                  Pass Through Trust Agreement of NWA Corp. and Northwest (filed as Exhibit 26 to the
                  S-3 and incorporated herein by reference).
</TABLE>
 
- ------------------------
 
*   To be filed by amendment.
 
                                     II-12

<PAGE>


                                                                  Exhibit 23(a)








                      Consent of Independent Accountants



We consent to the reference to our firm under the caption "Experts" in the 
Registration Statement (Form S-3 No. 333-00000) and related Prospectus of 
Northwest Airlines Corporation and Northwest Airlines, Inc. and to the 
incorporation by reference therein of our report dated February 23, 1996, 
with respect to the consolidated financial statements of Northwest Airlines 
Corporation incorporated by reference in its Annual Report (Form 10-K) for 
the year ended December 31, 1995 and the related financial statement schedule 
included therein, filed with the Securities and Exchange Commission.


                                                 /s/ Ernst & Young LLP


Minneapolis, Minnesota
September 26, 1996









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