UAL CORP /DE/
424B3, 1996-01-25
AIR TRANSPORTATION, SCHEDULED
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<PAGE>
                                                       FILED PURSUANT TO
                                                       RULE NO. 424(b)(3)
                                                       REGISTRATION NO. 33-57192

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED IN THIS PRELIMINARY PROSPECTUS SUPPLEMENT IS SUBJECT TO +
+COMPLETION OR AMENDMENT. THESE SECURITIES MAY NOT BE SOLD NOR MAY OFFERS TO   +
+BUY BE ACCEPTED PRIOR TO THE TIME THAT A FINAL PROSPECTUS SUPPLEMENT IS       +
+DELIVERED. THIS PRELIMINARY PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING        +
+PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN    +
+OFFER TO BUY NOR SHALL THERE BE A SALE OF THESE SECURITIES IN ANY STATE IN    +
+WHICH SUCH OFFER, SOLICITATION OR SALE SHALL BE UNLAWFUL PRIOR TO             +
+REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.    +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                             SUBJECT TO COMPLETION
            PRELIMINARY PROSPECTUS SUPPLEMENT DATED JANUARY 23, 1996
 
PROSPECTUS SUPPLEMENT
(To Prospectus dated April 28, 1995)
                                  $
                           [LOGO OF UNITED AIRLINES]

                    PASS THROUGH CERTIFICATES, SERIES 1996-A
                                 ------------
  Each Pass Through Certificate offered hereby (collectively, the
"Certificates") will represent a fractional undivided interest in one of the
two United Airlines 1996-A Pass Through Trusts (the "1996-A1 Trust" and the
"1996-A2 Trust" and, collectively, the "Trusts") to be formed pursuant to two
separate trust supplements (each, a "Trust Supplement") between United Air
Lines, Inc. ("United") and First Security Bank of Utah, National Association
(the "Trustee"), as trustee under each Trust, which supplement the Pass Through
Trust Agreement dated as of February 1, 1992, as amended and restated as of May
1, 1995 (the "Basic Agreement"). Upon purchase of the related Equipment Notes,
the property of the Trusts will consist of equipment notes (the "Equipment
Notes") to be issued on a nonrecourse basis by the trustees of separate owner
trusts (each, an "Owner Trustee") in connection with two separate leveraged
lease transactions to refinance not more than 80% of the equipment cost to the
related Owner Trustee of one Boeing 777-222 aircraft and one Boeing 747-451
aircraft (collectively, the "Aircraft") which have been leased to United.
  The Equipment Notes in respect of each Aircraft will be issued in two series.
Each Trust will purchase one series of the Equipment Notes issued with respect
to each of the Aircraft such that all of the Equipment Notes held in each Trust
will have an interest rate corresponding to the interest rate applicable to
such Trust. The maturity dates of the Equipment Notes acquired by each Trust
will occur on or before the final distribution date applicable to the
Certificates issued by such Trust. The Equipment Notes issued with respect to
each Aircraft will be secured by a security interest in such Aircraft and an
assignment of the Lease relating thereto, including the right to receive
rentals payable with respect to such Aircraft by United. Although neither the
Certificates nor the Equipment Notes are direct obligations of, or guaranteed
by, United, the amounts unconditionally payable by United for lease of the
Aircraft will be sufficient to pay in full when due all payments required to be
made on the Equipment Notes held in the Trusts.
                                                        (Continued on next page)
                                 ------------
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 SUPPLEMENT OR THE PROSPECTUS.  ANY
   REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                       Final
    Pass Through    Distribution   Principal   Interest       Price        Discounts and  Proceeds to the
    Certificates        Date         Amount      Rate     to Public (1)   Commissions (2) Trustees (1)(2)
- ---------------------------------------------------------------------------------------------------------
  <S>              <C>            <C>          <C>       <C>              <C>             <C>
  1996-A1.........                $                  %               %             %                 %
  1996-A2.........
- ---------------------------------------------------------------------------------------------------------
  Total...........                $                       $                $              $
- ---------------------------------------------------------------------------------------------------------
</TABLE>
- --------------------------------------------------------------------------------
(1) Plus accrued interest, if any, at the applicable interest rate from the
date of issuance of the Certificates.
(2) United will initially pay the underwriting discounts and commissions and
  the Owner Participants will reimburse United for such expenses. In addition,
  certain other expenses estimated at $             will be paid (other than
  certain expenses paid by United) by the Owner Participants.
                                 ------------
  The Certificates are offered by the Underwriters, subject to prior sale,
when, as and if delivered to and accepted by the Underwriters, and subject to
approval of certain legal matters by counsel for the Underwriters and to
certain other conditions. The Underwriters reserve the right to withdraw,
cancel or modify the offer and to reject orders in whole or in part. It is
expected that delivery of the Certificates in book-entry form will be made on
or about February   , 1996 through the facilities of The Depository Trust
Company, against payment therefor in immediately available funds.
                                 ------------
LEHMAN BROTHERS
                              MORGAN STANLEY & CO.
                                  INCORPORATED
                                                 NATWEST CAPITAL MARKETS LIMITED
January   , 1996
<PAGE>
 
(Continued from previous page)
 
  Interest paid on the Equipment Notes held in each Trust will each be passed
through to Certificateholders of such Trust on January 30 and July 30 of each
year, commencing July 30, 1996, at the rate per annum set forth on the cover
page hereof for such Trust until the final distribution date for such Trust.
Principal payments on the Equipment Notes held in each Trust will be passed
through to Certificateholders of each such Trust in scheduled amounts on
January 30 or July 30, or both, of certain years, commencing                ,
    , in the case of the 1996-A1 Trust, and              ,     , in the case of
the 1996-A2 Trust, until the final distribution date for such Trust.
 
  It is expected that delivery of the Certificates will be made against payment
therefor on or about the date specified in the last paragraph of the cover page
of this Prospectus Supplement, which will be the fifth business day following
the date of pricing of the Certificates (such settlement cycle being herein
referred to as "T+5"). Purchasers of Certificates should note that trading of
the Certificates on the date of pricing or the next succeeding business day may
be affected by the T+5 settlement. See "'Underwriting" in this Prospectus
Supplement.
 
                               ----------------
 
  IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE CERTIFICATES
OFFERED HEREBY AT LEVELS ABOVE THOSE WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED IN THE OVER-THE-COUNTER MARKET OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                                      S-2
<PAGE>
 
                         PROSPECTUS SUPPLEMENT SUMMARY
 
  The following summary does not purport to be complete and is qualified in its
entirety by the detailed information appearing elsewhere in this Prospectus
Supplement and the Prospectus accompanying this Prospectus Supplement (the
"Prospectus").
 
                                  THE COMPANY
 
  United is a wholly-owned subsidiary of UAL Corporation ("UAL"), accounting
for virtually all of UAL's revenues and expenses in 1995. United is one of the
world's largest airlines, as measured by operating revenues, revenue passengers
and revenue passenger miles flown. As of December 31, 1995, United served 144
airports in the United States and 30 foreign countries. During 1995, United
averaged 2,172 departures daily, flew a total of 112 billion revenue passenger
miles and carried an average of 215,521 passengers per day. As of December 31,
1995, United's fleet of aircraft totaled 558. United's major hub operations are
located at Chicago, Denver, San Francisco, Washington, D.C. and Tokyo.
 
                                  THE OFFERING
 
Glossary.............. Included at the end of this Prospectus Supplement as an
                       Appendix is a Glossary of certain of the significant
                       defined terms used herein.
 
Trusts................ The 1996-A1 Trust and the 1996-A2 Trust are each to be
                       formed pursuant to a separate Trust Supplement to the
                       Basic Agreement. Each Trust will be a separate entity.
 
Trust Property........ The property of each of the Trusts will consist of
                       Equipment Notes issued on a nonrecourse basis in two
                       separate leveraged lease transactions to refinance not
                       more than 80% of the equipment cost to the related
                       Owner Trustee of one Boeing 777-222 aircraft delivered
                       and leased by the related Owner Trustee to United in
                       May 1995 (the "777 Aircraft") and one Boeing 747-451
                       aircraft delivered and leased by the related Owner
                       Trustee to United in August 1994 (the "747 Aircraft").
                       The Equipment Notes with respect to each of the two
                       Aircraft will be issued by the related Owner Trustee in
                       two series. The maturity dates of the Equipment Notes
                       acquired by each Trust will occur on or before the
                       final distribution date applicable to the Certificates
                       issued by such Trust. The aggregate principal amount of
                       the Equipment Notes to be held in each Trust will be
                       the same as the aggregate principal amount of the
                       Certificates issued by that Trust.
 
Certificates
 Offered;Book-Entry
 Registration......... Each Certificate will represent a fractional undivided
                       interest in the related Trust. The Certificates of each
                       Trust will be issued in fully registered form only and
                       will be registered in the name of Cede & Co. ("Cede"),
                       as the nominee of The Depository Trust Company ("DTC").
                       No person acquiring an interest in the Certificates
                       will be entitled to receive a definitive certificate
                       representing such person's interest in the Trust,
                       unless definitive certificates are issued, which will
                       only occur under limited circumstances. See
                       "Description of the Certificates--General" in this
                       Prospectus Supplement and "Description of the
                       Certificates--General", "--Book-Entry Registration" and
                       "--Definitive Certificates" in the Prospectus.
 
Regular Distribution   
 Dates................ January 30 and July 30.
 
                                      S-3
<PAGE>
 
Special Distribution    
 Dates................ Any Business Day on which a Special Payment is to be
                       distributed.                                        

Record Dates.......... The fifteenth day preceding a Regular Distribution Date
                       or a Special Distribution Date.
 
Distributions......... Payments of interest with respect to the respective
                       Equipment Notes held in each Trust will be distributed
                       by the Trustee to the Certificateholders of such Trust
                       on the Regular Distribution Dates referred to above
                       commencing July 30, 1996, except in certain
                       circumstances. Payments of principal on the respective
                       Equipment Notes held in each Trust are scheduled to be
                       received in specified amounts by the Trustee of such
                       Trust on January 30 or July 30, or both, of certain
                       years, commencing               ,     , in the case of
                       the 1996-A1 Trust, and              ,     , in the case
                       of the 1996-A2 Trust, and to be distributed to the
                       Certificateholders of such Trust on the corresponding
                       Regular Distribution Date. Payments of principal,
                       premium, if any, and interest resulting from the early
                       redemption or purchase, if any, of the Equipment Notes
                       held in any Trust will be distributed on a Special
                       Distribution Date after not less than 20 days' notice
                       from the Trustee to the Certificateholders of such
                       Trust. For a discussion of distributions upon an Event
                       of Default, see "Description of the Certificates--
                       Events of Default and Certain Rights Upon an Event of
                       Default" in the Prospectus.
 
Method of             
 Distribution......... Under the terms of the Basic Agreement, United and the
                       Trustee will treat the persons in whose names the
                       Certificates are registered as the owners of such
                       Certificates for the purpose of receiving payments of
                       principal and interest on such Certificates and for all
                       other purposes whatsoever. So long as the Certificates
                       are registered in the name of Cede, as nominee of DTC,
                       distributions by the Trustee, including the final
                       distribution of principal with respect to the
                       Certificates of any Trust, will be made in same-day
                       funds to DTC. See "Description of Certificates--Same-
                       Day Settlement and Payment" in the Prospectus. DTC will
                       in turn make distributions in same-day funds to those
                       participants in DTC who are credited with ownership of
                       the Certificates ("DTC Participants") in amounts
                       proportionate to the amount of each such DTC
                       Participant's respective holdings of beneficial
                       interests in such Certificates. Corresponding payments
                       by the DTC Participants to beneficial owners of the
                       Certificates will be the responsibility of such DTC
                       Participants and will be made in accordance with
                       customary industry practices. See "Description of the
                       Certificates--Book-Entry Registration" in the
                       Prospectus. Therefore, neither United nor the Trustee
                       has any direct responsibility or liability for
                       distributions or payments to owners of beneficial
                       interests in the Certificates (the "Certificate
                       Owners"). At such time, if ever, as the Certificates
                       are issued in definitive form and not registered in the
                       name of Cede, as nominee for DTC, distributions by the
                       Trustee to Certificateholders, other than the final
                       distribution, will be made by check mailed to each
                       Certificateholder of record on the applicable record
                       date at its address appearing on the register. The
                       final distribution with respect to the Certificates of
                       any Trust will be made only upon surrender and
                       presentation thereof at the office or agency of the
                       Trustee. See "Description of the Certificates--
                       Definitive Certificates" in the Prospectus.
 
                                      S-4
<PAGE>
 
Equipment Notes:       
 Interest............. Interest will be payable on the Equipment Notes held in
                       each Trust on the unpaid principal amount thereof on
                       January 30 and July 30 of each year, commencing July
                       30, 1996, which interest will be passed through to
                       Certificateholders of such Trust on each such date.
 
                       Interest is calculated on the basis of a 360-day year
                       consisting of twelve 30-day months. See "Description of
                       the Certificates--General" and"--Payments and
                       Distributions" in this Prospectus Supplement.

Equipment Notes:       
 Principal............ Scheduled principal payments on the Equipment Notes
                       held in each Trust will be passed through to the
                       Certificateholders of such Trust on January 30 or July
                       30, or both, of certain years, commencing
                         ,     , in the case of the 1996-A1 Trust, and
                                    ,     , in the case of the 1996-A2 Trust,
                       in accordance with the principal repayment schedule set
                       forth below under "Description of Equipment Notes--
                       General". See "Description of the Certificates--
                       Payments and Distributions" in the Prospectus and this
                       Prospectus Supplement.
 
Equipment Notes:
 Redemption........... (a) The Equipment Notes issued with respect to an
                       Aircraft will be redeemed in whole upon the occurrence
                       of an Event of Loss to such Aircraft if such Aircraft
                       is not replaced by United and, with respect to the 777
                       Aircraft, will be redeemed in part upon the occurrence
                       of an Event of Loss with respect to an Engine under
                       certain circumstances specified in the related Lease,
                       in each case at a price equal to the Redemption Price
                       (as defined in the Glossary), but without any premium.
 
                       (b) If, with respect to an Aircraft, (i) one or more
                       Lease Events of Default shall have occurred and be
                       continuing for a period of one year or more and the
                       Equipment Notes issued with respect to such Aircraft
                       shall not have been accelerated or (ii) the Equipment
                       Notes with respect to such Aircraft shall have been
                       accelerated, then in each case the Equipment Notes
                       issued with respect to such Aircraft may be redeemed or
                       purchased by the related Owner Trustee or Owner
                       Participant on the applicable redemption or purchase
                       date at a price equal to the Redemption Price, but
                       without any premium.
 
                       (c) The Equipment Notes may under certain other
                       circumstances be redeemed or purchased on the
                       applicable redemption or purchase date at a price equal
                       to the Redemption Price, plus, if such redemption or
                       purchase is made prior to the respective dates set
                       forth below, a premium, if any:
 
<TABLE>
<CAPTION>
                                                 PREMIUM
                    TRUST                    TERMINATION DATE
                    -----                    ----------------
                    <S>                      <C>
                    1996-A1.................
                    1996-A2.................
</TABLE>
 
                       See "Description of the Equipment Notes--Redemption" in
                       this Prospectus Supplement for a description of the
                       manner of computing such premium and the circumstances
                       under which the Equipment Notes may be so redeemed or
                       purchased.
 
                                      S-5
<PAGE>

Equipment Notes:       
 Security............. The Equipment Notes issued with respect to each
                       Aircraft will be secured by a security interest in such
                       Aircraft and an assignment to the related Loan Trustee
                       of certain of the related Owner Trustee's rights under
                       the Lease with respect to such Aircraft, including the
                       right to receive payments of rent thereunder, with
                       certain exceptions. The Equipment Notes are not cross-
                       collateralized and, consequently, the Equipment Notes
                       issued in respect of any one Aircraft are not secured
                       by the other Aircraft or the Lease related thereto.
                       There are no cross-default provisions in the Indentures
                       and, consequently, events resulting in an Indenture
                       Default under either Indenture will not necessarily
                       result in an Indenture Default occurring under the
                       other Indenture. If the Equipment Notes issued with
                       respect to one Aircraft are in default, the Equipment
                       Notes issued with respect to the remaining Aircraft may
                       not be in default and, if not in default, no remedies
                       will be exercisable under the Indenture with respect to
                       such other Aircraft. See "Description of the Equipment
                       Notes--Security" in the Prospectus and "Description of
                       the Equipment Notes--Indenture Defaults, Notice and
                       Waiver" in this Prospectus Supplement.
 
                       Although the Equipment Notes are not obligations of, or
                       guaranteed by, United, the amounts unconditionally
                       payable by United for lease of the Aircraft will be
                       sufficient to pay in full when due all payments
                       required to be made on the Equipment Notes. See
                       "Description of the Equipment Notes--General" in the
                       Prospectus and this Prospectus Supplement.
 
Use of Proceeds....... The proceeds from the sale of the Certificates will be
                       used in part to purchase the Equipment Notes issued by
                       the related Owner Trustees in connection with the
                       refinancing of not more than 80% of the equipment cost
                       to the Owner Trustees of each of the Aircraft. The
                       Equipment Notes will represent in the aggregate the
                       entire debt portion of the leveraged lease transactions
                       relating to the two Aircraft. The remainder of the
                       proceeds will be used to reduce the initial equity
                       investments in the Aircraft by the related Owner
                       Participants. See "Use of Proceeds" in this Prospectus
                       Supplement.
 
Trustee............... First Security Bank of Utah, National Association
                       ("First Security"), will act as Trustee and as paying
                       agent and registrar for the Certificates of each Trust.
                       First Security also acts as Loan Trustee and as paying
                       agent and registrar for each series of Equipment Notes.
 
Federal Income Tax
 Consequences......... Each Trust will be classified as a grantor trust for
                       federal income tax purposes and therefore each
                       Certificate Owner will be treated as the owner of a pro
                       rata undivided interest in each of the Equipment Notes
                       and any other property held by such Trust and should
                       report on its federal income tax return its pro rata
                       share of income from such Equipment Notes and other
                       property held by such Trust in accordance with such
                       Certificate Owner's method of accounting. See "Federal
                       Income Tax Consequences" in the Prospectus.
 
                                      S-6
<PAGE>
 
                                  THE COMPANY
 
  United is a wholly-owned subsidiary of UAL Corporation ("UAL"), accounting
for virtually all of UAL's revenues and expenses in 1995. United is one of the
world's largest airlines, as measured by operating revenues, revenue passengers
and revenue passenger miles flown. As of December 31, 1995, United served 144
airports in the United States and 30 foreign countries. During 1995, United
averaged 2,172 departures daily, flew a total of 112 billion revenue passenger
miles and carried an average of 215,521 passengers per day. As of December 31,
1995, United's fleet of aircraft totalled 558. United's major hub operations
are located at Chicago, Denver, San Francisco, Washington, D.C. and Tokyo.
 
  The executive offices of United are located at 1200 East Algonquin Road, Elk
Grove Township, Illinois 60007. The mailing address of United is P.O. Box
66100, Chicago, Illinois 60666. The telephone number for United is (847) 952-
4000.
 
                              RECENT DEVELOPMENTS
 
  On January 23, 1996, UAL reported full year 1995 preliminary unaudited net
earnings of $349 million. The 1995 earnings, before an after-tax $29 million
extraordinary loss on the early extinguishment of debt, were $378 million, a
company record for earnings from ongoing operations (before extraordinary
items). Earnings per share were $19.11 on a fully diluted basis ($20.01 per
share on a primary basis). In 1994, UAL reported net earnings of $51 million,
including $128 million of one-time after-tax charges associated with the
completion of the recapitalization and a one-time after-tax charge of $26
million associated with the adoption of SFAS No. 112. Operating earnings for
1995 were $829 million on operating revenues of $14,943 million. Operating
earnings were $521 million in 1994 on operating revenues of $13,950 million.
 
  UAL also reported that on a pro forma, fully distributed basis (see below for
further explanation of the methodology) 1995 net earnings were $662 million or
$20.51 per share after preferred dividends. Fully distributed operating
earnings for 1995 were $1,333 million. UAL reported that available seat miles
grew 4.2% in 1995 to 158.6 billion from 152.2 billion in 1994. Traffic
increased by 3.2% reflecting growth in revenue passenger miles to 111.8 billion
from 108.3 billion in 1994. While the resulting passenger load factor decreased
0.7 points to 70.5% in 1995 from 71.2% in 1994, the breakeven passenger load
factor also decreased, by 2.1 points, to 66.1% from 68.2% the prior year. Yield
(revenue per passenger mile) increased by 4.2% for the year to 11.79c, up from
11.31c in 1994.
 
  For the fourth quarter, UAL reported a net loss of $5 million excluding
certain special adjustments, or a loss of $1.25 per share after preferred
dividends.
 
  In the fourth quarter, UAL recorded the following special adjustments:
 
    . An extraordinary loss of $29 million ($2.35 per share) after-tax due to
       early extinguishment of debt,
    . A $13 million ($1.09 per share) after-tax adjustment to depreciation
       associated with a write-down of non-operating aircraft, and
    . A $1.81 per share unfavorable impact due to the repurchase of a portion
       of outstanding Series B preferred stock.
 
The fourth quarter net loss including the special adjustments was $47 million
or a loss of $6.50 per share after preferred dividends. For the comparable
quarter in 1994, UAL reported net income of $11 million (a loss of $0.98 per
share after preferred dividends).
 
                                      S-7
<PAGE>
 
  On a fully distributed basis, UAL fourth quarter net income, excluding the
special adjustments, was $98 million or $2.95 per share for each of the 30.7
million fully distributed shares. The fully distributed net earnings
represented a 46% increase from 1994's fourth quarter fully distributed net
earnings of $67 million with earnings per share being an 88% improvement over
last year's fully distributed earnings per share of $1.57. Fully distributed
operating earnings for the quarter, excluding the special adjustments, were
$212 million, a 23% improvement over 1994's $172 million.
 
  In addition to reviewing financial statements reported under generally
accepted accounting principles (GAAP), UAL believes a more complete
understanding of its results can be gained by viewing them on a pro forma,
fully distributed basis. This approach considers all ESOP shares (which will be
issued to employees over the course of the ESOP period) to be immediately
outstanding and thus fully distributed. Consistent with this method, the ESOP
compensation expense (which reflects the commitment of stock to employees) is
excluded from fully distributed expenses and ESOP convertible preferred stock
dividends have not been deducted from earnings attributable to common
shareholders.
 
                                      S-8
<PAGE>
 
                     SELECTED FINANCIAL AND OPERATING DATA
 
  The following financial information should be read in conjunction with the
consolidated financial statements and related notes of United included in its
Annual Report on Form 10-K for the year ended December 31, 1994. The following
information for the five years ended December 31, 1994 has been derived from
United's consolidated financial statements, which statements have been audited
by Arthur Andersen LLP, independent public accountants, as indicated in their
reports incorporated by reference herein. Reference is made to said reports for
the years 1994, 1993 and 1992 which include an explanatory paragraph with
respect to the changes in methods of accounting for income taxes and post-
retirement benefits other than pensions discussed in the notes to the
consolidated financial statements for such years. The financial information for
the nine months ended September 30, 1995 and 1994 is unaudited but in the
opinion of management includes all adjustments necessary for a fair
presentation. See "Incorporation of Certain Documents by Reference" in the
Prospectus.
 
<TABLE>
<CAPTION>
                              NINE MONTHS
                          ENDED SEPTEMBER 30,           YEAR ENDED DECEMBER 31,
                          -------------------   -------------------------------------------
                            1995       1994      1994     1993     1992     1991     1990
                          ---------  ---------  -------  -------  -------  -------  -------
                                             (DOLLARS IN MILLIONS)
<S>                       <C>        <C>        <C>      <C>      <C>      <C>      <C>
Statement of
 consolidated operations
 data:
 Operating revenues.....  $  11,239  $  10,464  $13,887  $13,168  $11,688  $10,703  $10,282
 Earnings (loss) from
  operations............        809        437      513      295     (496)    (491)     (41)
 Earnings (loss) before
  extraordinary item and
  cumulative effect of
  accounting changes....        384         56       66      (17)    (386)    (335)      96
 Net earnings (loss)....        384         30       40      (36)    (933)    (335)      96
Statement of
 consolidated financial
 position data (at end
 of period):
 Total assets...........  $  12,392  $  12,261  $11,952  $12,153  $12,067  $ 9,907  $ 8,001
 Total long-term debt
  and capital lease
  obligations, including
  current maturities....      3,757      4,173    4,015    3,614    3,628    2,531    1,326
 Shareholder's equity...        701       (175)     (56)     674      738    1,613    1,769
Operating data:
 Revenue passengers
  (millions)............         59         55       74       70       67       62       58
 Average length of
  passenger trip in
  miles.................      1,423      1,473    1,459    1,450    1,390    1,327    1,322
 Revenue passenger miles
  (millions)............     84,462     81,292  108,299  101,258   92,690   82,290   76,137
 Available seat miles
  (millions)............    118,929    113,790  152,193  150,728  137,491  124,100  114,995
 Passenger load factor..       71.0%      71.4%    71.2%    67.2%    67.4%    66.3%    66.2%
 Break even passenger
  load factor...........       65.3%      68.1%    68.2%    65.5%    70.6%    69.7%    66.5%
 Revenue per passenger
  mile..................       11.8c      11.4c    11.3c    11.6c    11.3c    11.5c    11.8c
 Cost per available seat
  mile..................        8.8c       8.8c     8.8c     8.5c     8.9c     9.0c     9.0c
 Average price per
  gallon of jet fuel....       58.0c      58.2c    58.8c    63.6c    66.4c    71.6c    80.4c
</TABLE>
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
  The following table sets forth the ratio of earnings to fixed charges for
United for the periods indicated. Earnings represent earnings before income
taxes and fixed charges (excluding interest capitalized). Fixed charges consist
of interest and the portion of rental expenses deemed representative of the
interest factor.
 
<TABLE>
<CAPTION>
                                       NINE MONTHS
                                   ENDED SEPTEMBER 30, YEAR ENDED DECEMBER 31,
                                   ------------------- ------------------------
                                     1995      1994    1994 1993 1992 1991 1990
                                   --------- --------- ---- ---- ---- ---- ----
<S>                                <C>       <C>       <C>  <C>  <C>  <C>  <C>
Ratio of earnings to fixed
 charges..........................   1.64      1.12    1.11 (a)  (a)  (a)  1.16
</TABLE>
- --------
(a) Earnings were inadequate to cover fixed charges by $77 million in 1993,
    $694 million in 1992 and $604 million in 1991.
 
                                      S-9
<PAGE>
 
                                USE OF PROCEEDS
 
  The Certificates are being issued in connection with the refinancing of the
debt portion of two separate leveraged lease transactions entered into by
United, as lessee, with respect to the 777 Aircraft and the 747 Aircraft. The
$             aggregate principal amount of debt currently outstanding with
respect to the two Aircraft consists of variable interest rate loan
certificates maturing May 29, 2011 and January 30, 2013. In addition to the
repayment of such debt, an aggregate of $           of the proceeds will be
used to reduce the initial equity investments in the Aircraft by the Owner
Participants. The proceeds from the sale of the Certificates are to be used by
the Trustees on behalf of the Trusts to purchase $               aggregate
principal amount of Equipment Notes issued by the related Owner Trustees to
refinance not more than 80% of the equipment cost to such Owner Trustees of the
related Aircraft. The 777 Aircraft was delivered new to United in May 1995 and
the 747 Aircraft was delivered new to United in August 1994, and each Aircraft
was sold to the related Owner Trustee and leased back to United within one
month of delivery.
 
  The Equipment Notes will be issued under two separate Indentures between
First Security, as Loan Trustee thereunder, and State Street Bank and Trust
Company of Connecticut, National Association, not in its individual capacity
but solely as Owner Trustee of a trust for the benefit of an Owner Participant.
Each Owner Participant provided from its own funds at least 20% of the
equipment cost of the related Aircraft and beneficially owns the related
Aircraft. No Owner Participant, however, will be personally liable for any
amount payable under the related Indenture or the Equipment Notes issued
thereunder.
 
                                      S-10
<PAGE>
 
                              DIAGRAM OF PAYMENTS
 
  The diagram below illustrates certain aspects of the payment flows among
United, the Owner Trustees, the Loan Trustees, the Trustees, the Owner
Participants and the Certificateholders with respect to the two Trusts and the
two related Aircraft.
 
  United has leased each Aircraft under a separate Lease from the Owner Trustee
for such Aircraft. The Equipment Notes for each such Aircraft will be issued by
such Owner Trustee in two series (each series to be purchased by one of the
Trusts) and will be secured by such Aircraft and by an assignment of certain
rights of the related Owner Trustee under the related Lease, which assignment
requires United to make rental payments for each Aircraft directly to the
related Loan Trustee. From these rental payments such Loan Trustee will on
behalf of the related Owner Trustee first make payments to the Trustee for each
of the Trusts on the Equipment Notes held in such Trust and will pay the
remaining balance to the respective Owner Trustee for the benefit of the
respective Owner Participant. The Trustee for each of the Trusts will pass
through to the Certificateholders payments received with respect to the
Equipment Notes held in such Trust. First Security will act as Trustee of each
of the two Trusts and as Loan Trustee under the two Indentures.


 ----------------------------------------------------------------------------- 
 |                           United Air Lines, Inc.                          |
 -----------------------------------------------------------------------------
                      |                                |                
                      |      Lease Rental Payments     |              
                      |           Assigned by          |         
                      |          Owner Trustees        |     
                     \/                               \/  
                -------------------        -------------------
                |  Loan Trustee   |        |  Loan Trustee   |
            ----|       for       |        |      for        |----
            |   |  Aircraft No. 1 |        |  Aircraft No. 2 |    |    
            |   -------------------        -------------------    |
Excess      |         |                                |          |     Excess
Payments    |         ----------------------------------          |     Payments
            |           |            1996-A          |            |
            |           |   Equipment Note Payments  |            |
            |           |                            |            |
           \/          \/                           \/           \/            
- ------------------   -----------------    -----------------   ------------------
| Owner Trustee  |   | Pass Through  |    | Pass Through  |   | Owner Trustee  |
|      for       |   | Trustee for   |    | Trustee for   |   |      for       |
| Aircraft No. 1 |   | Pass Through  |    | Pass Through  |   | Aircraft No. 2 |
|                |   | Trust 1996-A1 |    | Trust 1996-A2 |   |                |
- ------------------   -----------------    -----------------   ------------------
            |           |                            |            |       
Excess      |           |          Pass Through      |            |     Excess
Payments    |           |           Certificate      |            |     Payments
            |           |          Distributions     |            |    
            |           |                            |            |
           \/          \/                           \/           \/     
- ------------------   -----------------    -----------------   ------------------
|      Owner     |   | Holders of    |    | Holders of    |   |     Owner      |
| Participant for|   | Pass Through  |    | Pass Through  |   | Participant for|
| Aircraft No. 1 |   | Certificates, |    | Certificates, |   | Aircraft No. 2 |
|                |   | Series 1996-A1|    | Series 1996-A2|   |                |
- ------------------   -----------------    -----------------   ------------------
 
 
 
 
 
 
                                      S-11
<PAGE>
 
                        DESCRIPTION OF THE CERTIFICATES
 
  The Certificates offered hereby will be issued pursuant to two separate Trust
Supplements to the Basic Agreement. The Prospectus provides for the issuance of
up to $1,035,000,000 aggregate principal amount of pass through certificates
(or such greater amount if issued at an original issue discount as shall result
in aggregate proceeds of $1,035,000,000) pursuant to the Basic Agreement, which
securities were registered with the Commission on April 27, 1992 and May 28,
1993. In May 1995, United Airlines Pass Through Certificates, Series 1995-A, in
an aggregate principal amount of $246,302,000 were issued pursuant to the Basic
Agreement and two trust supplements thereto. The following summary of the
particular terms of the Certificates offered hereby supplements, and to the
extent inconsistent therewith replaces, the description of the general terms
and provisions of the Certificates set forth in the Prospectus under the
heading "Description of the Certificates". The statements under this caption
are a summary and do not purport to be complete. The summary makes use of terms
defined in and is qualified in its entirety by reference to all of the
provisions of the Basic Agreement, a form of which has been filed as an exhibit
to the Registration Statement of which this Prospectus Supplement is a part,
and to all of the provisions of the Trust Supplements which, together with the
forms of the related Note Purchase Agreements, Indentures, Leases, Trust
Agreements and Participation Agreements, will be filed as exhibits to a Current
Report on Form 8-K to be filed by United with the Commission in connection with
this offering. Except as otherwise indicated, the following summary relates to
each of the Trusts and the Certificates issued by each Trust. The terms and
conditions governing each of the Trusts will be substantially the same, except
that the principal amount, the interest rate, scheduled repayments of
principal, and maturity date applicable to the Equipment Notes held by each
Trust and the final distribution date applicable to each Trust will differ.
Citations to the relevant sections of the Basic Agreement appear below in
parentheses unless otherwise indicated.
 
GENERAL
 
  The Certificates of each Trust will be issued in fully registered form only.
Each Certificate will represent a fractional undivided interest in the Trust
created by the Trust Supplement pursuant to which such Certificate is issued.
The property of each Trust (the "Trust Property") will include the Equipment
Notes held in such Trust, all monies at any time paid thereon, all monies due
and to become due thereunder and funds from time to time deposited with the
Trustee in accounts relating to such Trust. Each Certificate will represent a
pro rata share of the property held in the related Trust and will be issued
only in integral multiples of $1,000. (Sections 2.01 and 3.01) The Certificates
will be issued pursuant to a book-entry system and will be registered in the
name of Cede as the nominee of DTC. No Certificate Owner will be entitled to
receive a certificate representing such person's interest in Certificates,
except as set forth in the Prospectus under "Description of the Certificates--
Definitive Certificates". Unless and until Definitive Certificates (as defined
in the Prospectus) are issued under the limited circumstances described in the
Prospectus, all references to actions by Certificateholders shall refer to
actions taken by DTC upon instructions from DTC Participants (as defined in the
Prospectus), and all references herein to distributions, notices, reports and
statements to Certificateholders shall refer, as the case may be, to
distributions, notices, reports and statements to DTC or Cede, as the
registered holder of the Certificates, or to DTC Participants for distribution
to Certificate Owners in accordance with DTC procedures. See "Description of
the Certificates--Book-Entry Registration", "--Definitive Certificates", and
"--Same-Day Settlement and Payment" in the Prospectus.
 
  Interest will be passed through to Certificateholders of each Trust at the
applicable rate per annum set forth on the cover page of this Prospectus
Supplement, which is calculated on the basis of a 360-day year of twelve 30-day
months.
 
  The Certificates represent interests in the respective Trusts and all
payments and distributions will be made only from the Trust Property. (Section
3.08) The Certificates do not represent an interest in or obligation of United,
the Trustees, any of the Loan Trustees or Owner Trustees in their individual
capacities, any Owner Participant, or any affiliate of any thereof.
 
 
                                      S-12
<PAGE>
 
PAYMENTS AND DISTRIBUTIONS
 
  Payments of principal, premium, if any, and interest with respect to the
Equipment Notes held in each Trust will be distributed by the Trustee to
Certificateholders of such Trust on the date receipt of such payment is
confirmed, except in certain cases when some or all of such Equipment Notes are
in default. See "Description of Certificates--Events of Default and Certain
Rights Upon an Event of Default" in the Prospectus. Interest will be payable on
the Equipment Notes held in each Trust on the unpaid principal amount thereof
on January 30 and July 30 of each year, commencing July 30, 1996. Scheduled
principal payments on the Equipment Notes held in each Trust will be passed
through to the Certificateholders of such Trust on January 30 or July 30, or
both, of certain years, commencing              ,     , in the case of the
1996-A1 Trust, and              ,     , in the case of the 1996-A2 Trust, in
accordance with the principal repayment schedule set forth below under
"Description of Equipment Notes--General" (such scheduled payments of interest
and principal on the Equipment Notes are herein referred to as "Scheduled
Payments", and January 30 and July 30 of each year are herein referred to as
"Regular Distribution Dates"). See "Description of the Equipment Notes--
General" in this Prospectus Supplement. The Trustee of each Trust will
distribute on each Regular Distribution Date to the Certificateholders of such
Trust all Scheduled Payments, the receipt of which is confirmed by the Trustee
on such Regular Distribution Date. Each Certificateholder 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 such Trust. Each such distribution of Scheduled Payments will be made by the
Trustee to the Certificateholders of the applicable Trust of record on the
Record Date applicable to such Scheduled Payment subject to certain exceptions.
(Sections 4.01 and 4.02) If a Scheduled Payment is not received by the Trustee
on a Regular Distribution Date but is received within five days thereafter, it
will be distributed on the date of confirmed receipt to such holders of record.
If it is received after such five-day period, it will be treated as a Special
Payment (as defined below) and distributed as described below.
 
  Payments of principal, premium, if any, and interest received by the Trustee
on account of the early redemption, if any, of the Equipment Notes held in a
Trust, and payments received by the Trustee following a default in respect of
Equipment Notes held in a Trust, relating to one or more Aircraft (including
payments received by the Trustee on account of the purchase by the related
Owner Trustee or Owner Participant of such Equipment Notes or payments received
on account of the sale of such Equipment Notes by the Trustee) or Owner
Participant (each, a "Special Payment") will be distributed on, in the case of
an early redemption or a purchase, the date of such early redemption or
purchase (which shall be a Business Day), and otherwise on the Business Day
specified for distribution of such Special Payment pursuant to a notice
delivered by the Trustee as soon as practicable after the Trustee has confirmed
that it has received funds for such Special Payment (each, a "Special
Distribution Date"). In the event of redemption or purchase of Equipment Notes
held in either Trust, the Trustee will mail notice to the Certificateholders of
such Trust not less than 20 days prior to the Special Distribution Date on
which such Special Payment is scheduled to be distributed by the Trustee
stating such anticipated Special Distribution Date. (Section 4.02) Each
distribution of a Special Payment, other than a final distribution, on a
Special Distribution Date for any Trust will be made by the Trustee to the
Certificateholders of record of such Trust on the Record Date applicable to
such Special Payment. See "Description of the Equipment Notes--Redemption" in
this Prospectus Supplement and "Description of the Certificates--Events of
Default and Certain Rights Upon an Event of Default" in the Prospectus.
 
  The Basic Agreement requires that the Trustee establish and maintain, for
each Trust and for the benefit of the Certificateholders of such Trust, one or
more accounts (the "Certificate Account") for the deposit of payments
representing Scheduled Payments on the Equipment Notes held in such Trust. The
Basic Agreement also requires that the Trustee establish and maintain, for each
Trust and for the benefit of the Certificateholders of such Trust, one or more
accounts (the "Special Payments Account") for the deposit of payments
representing Special Payments, which account shall be non-interest bearing
except in certain circumstances where the Trustee may invest amounts in such
account in certain permitted investments. Pursuant to the terms of the Basic
Agreement, the Trustee is required to deposit any Scheduled Payments relating
to the applicable Trust received by it in the Certificate Account of such Trust
and to deposit any
 
                                      S-13
<PAGE>
 
Special Payments so received by it in the Special Payments Account of such
Trust. (Section 4.01) All amounts so deposited will be distributed by the
Trustee on a Regular Distribution Date or a Special Distribution Date, as
appropriate. (Section 4.02)
 
  At such time, if any, as the Certificates are issued in the form of
Definitive Certificates and not to Cede, as nominee for DTC, distributions by
the Trustee from the Certificate Account or the Special Payments Account of
each Trust on a Regular Distribution Date or a Special Distribution Date will
be made by check mailed to each Certificateholder of record of such Trust on
the applicable Record Date at its address appearing on the register maintained
with respect to such Trust. (Section 4.02) The final distribution for each
Trust, however, will be made only upon presentation and surrender of the
Certificates for such Trust at the office or agency of the Trustee specified in
the notice given by the Trustee of such final distribution. The Trustee will
mail such notice of the final distribution to the Certificateholders of such
Trust, specifying the date set for such final distribution and the amount of
such distribution. (Section 11.01) See "Description of the Certificates--
Termination of the Trusts" in the Prospectus.
 
  If any Regular Distribution Date or Special Distribution Date is not a
Business Day, distributions scheduled to be made on such Regular Distribution
Date or Special Distribution Date will be made on the next succeeding Business
Day without additional interest. (Section 12.10)
 
  To the extent that any of the Equipment Notes contemplated to be held in the
related Trust are not purchased out of the proceeds from the sale of
Certificates on the date of issuance of the Certificates, the Trustee may use
the unused portion of the proceeds for the purchase of such Equipment Notes at
any time on or prior to March 31, 1996, and pending such purchase the Trustee
will hold such proceeds from the sale of Certificates in an escrow account.
Such proceeds will be invested, at the direction and risk of, and for the
account of, United, 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 Ratings Services, (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 Ratings Services; 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 (iii) 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 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 April 20,
1996. Earnings on such investments in the escrow account for each Trust will be
paid to United periodically, and United will be responsible for any losses and
United will pay to the Trustee on demand any such losses such that the amount
of proceeds held in the escrow account shall be sufficient to purchase the
Equipment Notes. To the extent that any amount of the proceeds held in the
escrow account referred to above is not used to purchase Equipment Notes on or
prior to March 31, 1996, an amount equal to the unused proceeds will be
distributed by the Trustee to the holders of record of the Certificates on a
pro rata basis upon not less than 20 days' prior notice to them as a Special
Payment on a Special Distribution Date not later than April 20, 1996, together
with interest thereon at a rate equal to the rate applicable to such
Certificates, but without premium, and United will pay to the Trustee on such
date an amount equal to such interest. (Sections 1.01 and 2.02(b))
 
  In the event of a delayed purchase of Equipment Notes as described above, on
July 30, 1996, United will pay to the Trustee of each Trust an amount equal to
the interest that would have accrued on any Equipment Notes purchased on a
delayed basis by such Trust for the period from the date of the issuance of
 
                                      S-14
<PAGE>
 
the Certificates to, but excluding, the date of the purchase of such Equipment
Notes by the Trustee, which amount will be passed through to Certificateholders
of such Trust on such date, together with any interest on the Equipment Notes
held in such Trust. (Section 2.02(b))
 
POOL FACTORS
 
  Unless there has been an early redemption, purchase, or a default in the
payment of principal or interest, in respect of one or more issues of the
Equipment Notes held in a Trust, as described in "Description of the Equipment
Notes--Redemption" in this Prospectus Supplement and "Description of
Certificates--Events of Default and Certain Rights Upon an Event of Default" in
the Prospectus, the Pool Factor with respect to the 1996-A1 Trust and 1996-A2
Trust will decline in proportion to the scheduled repayments of principal on
the Equipment Notes held in such Trusts as described below in "Description of
the Equipment Notes--General". In the event of such redemption, purchase or
default, the Pool Factor and the Pool Balance of each Trust so affected will be
recomputed after giving effect thereto and notice thereof will be mailed to the
Certificateholders of such Trust. Each Trust will have a separate Pool Factor.
 
  The "Pool Balance" for each Trust indicates, as of any date, the aggregate
unpaid principal amount of the Equipment Notes held in such Trust on such date
plus any amounts in respect of principal on such Equipment Notes held by the
Trustee and not yet distributed. 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 held
in such Trust and the distribution thereof to be made on that date.
 
  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 the distribution thereof to be made
on that date. Assuming that no early redemption or purchase, or default, in
respect of any Equipment Notes shall have occurred, the Pool Factor for each
Trust will initially be 1.0000000; thereafter, the Pool Factor for each Trust
will decline as described herein to reflect reductions in the Pool Balance of
such Trust. The amount of a Certificateholder's pro rata share of the Pool
Balance of a Trust can be determined by multiplying the original principal
amount 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
Certificateholders of such Trust on each Regular Distribution Date and Special
Distribution Date.
 
                                      S-15
<PAGE>
 
  As of the date of sale by the Trustee of the Certificates and assuming that
no early redemption or purchase, or default in the payment of principal, in
respect of any Equipment Notes shall occur, the Scheduled Payments of principal
on the Equipment Notes held in the 1996-A1 Trust and 1996-A2 Trust, and the
resulting Pool Factors for such Trusts after taking into account each Scheduled
Payment, are set forth below:
 
<TABLE>
<CAPTION>
                  1996-A1 TRUST                      1996-A2 TRUST
  REGULAR        % EQUIPMENT NOTES    1996-A1       % EQUIPMENT NOTES    1996-A2
DISTRIBUTION        SCHEDULED        TRUST POOL        SCHEDULED        TRUST POOL
   DATES      PAYMENTS OF PRINCIPAL    FACTOR    PAYMENTS OF PRINCIPAL    FACTOR
- ------------  ---------------------  ----------  ---------------------  ----------
<S>           <C>                   <C>          <C>                   <C>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
</TABLE>
 
                                      S-16
<PAGE>
 
                       DESCRIPTION OF THE EQUIPMENT NOTES
 
  The following summarizes the particular terms and provisions of the Equipment
Notes and supplements, and to the extent inconsistent therewith replaces, the
description of the general terms and provisions of the Equipment Notes set
forth in the Prospectus under the heading "Description of the Equipment Notes."
The statements under this caption are summaries and do not purport to be
complete. The summaries make use of terms defined in and are qualified in their
entirety by reference to all of the provisions of the Equipment Notes, the Note
Purchase Agreement, the Indentures, the Leases, the Participation Agreements
and the Trust Agreements, the forms of which will be filed as exhibits to a
Current Report on Form 8-K to be filed by United with the Commission in
connection with this offering. Except as otherwise indicated, the following
summaries relate to the Equipment Notes, the Note Purchase Agreement, if any,
the Indenture, the Lease, the Participation Agreement and the Trust Agreement
relating to each Aircraft.
 
GENERAL
 
  The Equipment Notes with respect to each Aircraft will be issued in two
series. The Equipment Notes with respect to each Aircraft are to be issued
under a separate Indenture between State Street Bank and Trust Company of
Connecticut, National Association, as Owner Trustee of a trust for the benefit
of the Owner Participant which is the beneficial owner of such Aircraft, and
First Security, as Loan Trustee.
 
  The Owner Trustee has leased each Aircraft to United pursuant to a separate
Lease between the related Owner Trustee and United with respect to such
Aircraft and has granted a security interest in such Aircraft and the rentals
and other amounts due under the related Lease to the related Loan Trustee as
security for the related Equipment Notes. United is 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 at least sufficient to pay
when due all payments required to be made on the Equipment Notes issued with
respect to such Aircraft. The Equipment Notes are not, however, obligations of,
or guaranteed by, United. United's rental obligations under each Lease are
general obligations of United.
 
  Interest will be payable on the Equipment Notes held in each Trust on the
unpaid principal amount thereof on January 30 and July 30 of each year,
commencing July 30, 1996, which interest will be passed through to
Certificateholders of such Trust on each such date. Interest is calculated on
the basis of a 360-day year consisting of twelve 30-day months.
 
  The aggregate principal amounts of the Equipment Notes to be issued with
respect to each Aircraft, as such Equipment Notes are to be held in each of the
Trusts, is as follows:
 
<TABLE>
<CAPTION>
AIRCRAFT   AIRCRAFT       1996-A1 TRUST         1996-A2 TRUST         1996-A
  NO.        TYPE        % EQUIPMENT NOTES     % EQUIPMENT NOTES   TRUSTS TOTAL
- --------   --------    -------------------   -------------------   ------------
<S>        <C>         <C>                   <C>                   <C>
   1       B777-222
   2       B747-451
                           ----------            ----------         ----------
                           $                     $                  $
                           ==========            ==========         ==========
</TABLE>
 
 
                                      S-17
<PAGE>
 
  The Scheduled Payments of principal on the Equipment Notes to be held in the
1996-A1 Trust and 1996-A2 Trust are as follows:
 
                                 1996-A1 TRUST
                                % EQUIPMENT NOTES
 
<TABLE>
<CAPTION>
                REGULAR
           DISTRIBUTION DATES      AIRCRAFT NO. 1 AIRCRAFT NO. 2 AGGREGATE TOTAL
           ------------------      -------------- -------------- ---------------
      <S>                          <C>            <C>            <C>
 
                                     ----------     ----------     ----------
      Total.......................
                                     ==========     ==========     ==========
</TABLE>
 
                                      S-18
<PAGE>
 
                                 1996-A2 TRUST
                                % EQUIPMENT NOTES
 
<TABLE>
<CAPTION>
                REGULAR
           DISTRIBUTION DATES      AIRCRAFT NO. 1 AIRCRAFT NO. 2 AGGREGATE TOTAL
           ------------------      -------------- -------------- ---------------
      <S>                          <C>            <C>            <C>
 
                                     ----------     ----------     ----------
      Total.......................
                                     ==========     ==========     ==========
</TABLE>
 
  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 Equipment Notes issued with respect to each Aircraft are separately
subject to redemption or purchase in whole prior to maturity, without the
consent of the Trustee, (i) on the Regular Distribution Dates occurring on or
after the date specified in the related Lease (the earliest of which for any
Aircraft is January 30, 2002) in connection with a voluntary termination by
United of the related Lease if such Aircraft has been declared by United to be
surplus to its requirements or economically obsolete to it, (ii) on certain
Regular Distribution Dates as specified in the related Lease (the earliest of
which is July 30, 2008) in connection with a purchase by United of such
Aircraft where United does not assume the obligations of the applicable Owner
Trustee under the related Indenture, (iii) on any Special Distribution Date
occurring on or after February    , 2001 in connection with an optional
redemption as a part of a refunding or refinancing thereof or (iv) at the
option of the applicable Owner Trustee or Owner Participant at any time after
one or more Lease Events of Default under the related Lease shall have occurred
and be continuing for a period of 180 days or more but less than one year
during which period such Equipment Notes shall not have been accelerated, on
the Special Distribution Date following notice by such Owner Trustee or Owner
Participant of its election to so redeem or purchase such Equipment Notes. The
price for the Equipment Notes redeemed under the circumstances set forth above
shall be equal to the Redemption Price, plus a premium (as defined below), if
any. If the sale of an Aircraft contemplated to occur on a lease termination
date is not completed, the corresponding redemption will not take place and any
notice of redemption will be deemed revoked. (Indentures, Article 6 and Section
8.03; Leases, Sections 9(b) and 19(b); Participation Agreements, Section 17)
 
                                      S-19
<PAGE>
 
  The "premium," if any, with respect to the Equipment Notes to be redeemed or
purchased on any redemption or purchase date will be an amount which an
independent investment banking institution of national standing selected by
United (or, in certain circumstances, the applicable Owner Trustee or Loan
Trustee) shall determine to be equal to the excess, if any, of (i) the sum of
the present values of all the remaining Scheduled Payments of principal and
interest from such redemption date to maturity of such Equipment Notes,
discounted semiannually on each January 30 and July 30 at a rate equal to the
Treasury Yield (as defined below), based on a 360-day year of twelve 30-day
months, over (ii) the aggregate unpaid principal amount of such Equipment Notes
plus accrued but unpaid interest on such Equipment Notes (but not any accrued
interest in default), provided, however, that, if such redemption or purchase
occurs on or after               ,     , in the case of the Equipment Notes
held in the 1996-A1 Trust, or               ,     , in the case of Equipment
Notes held in the 1996-A2 Trust, the premium shall be zero. (Indentures,
Section 6.01(b))
 
  The "Treasury Yield" means, with respect to each Equipment Note to be
redeemed or purchased, (x) in the case of an Equipment Note having a maturity
less than one year after the applicable redemption or purchase date, the
average yield to stated maturity on a government bond equivalent basis of the
applicable United States Treasury Bill due the week of the maturity of such
Equipment Note or (y) in the case of an Equipment Note having a maturity of one
year or more after the applicable redemption or purchase date, the average
yield to stated maturity of the most comparable United States Treasury Notes or
Bonds as identified by an independent investment banker, corresponding in
maturity to the Remaining Weighted Average Life (as defined below) of such
Equipment Note (or, if there is no maturity corresponding to such Remaining
Weighted Average Life, an interpolation of maturities by such independent
investment banker), in each case under (x) and (y) above determined by such
independent investment banker based on the average of the yields to stated
maturity determined from the bid prices on the fourth Business Day preceding
the applicable redemption or purchase date.
 
  The "Remaining Weighted Average Life" of such Equipment Note, at the
redemption or purchase date of such Equipment Note, shall be the number of
years obtained by dividing (a) the sum of the products obtained by multiplying
(i) the amount of each then remaining Scheduled Payment of principal, including
the payment due on the maturity date of such Equipment Note, by (ii) the number
of years (calculated to the nearest one-twelfth) which will elapse between the
redemption or purchase date and the Regular Distribution Dates of such
Scheduled Payments of principal, by (b) the then outstanding principal amount
of such Equipment Note.
 
  In addition, the Equipment Notes issued with respect to each Aircraft are
separately subject to redemption or purchase prior to maturity, without the
consent of the Trustee, at a price equal to the Redemption Price, but without
any premium (i) in whole at the option of the applicable Owner Trustee or Owner
Participant, at any time after the occurrence and continuation of one or more
Lease Events of Default under the related Lease for a period of one year or
more during which period such Equipment Notes shall not have been accelerated,
(ii) in whole upon the acceleration of such Equipment Notes, (iii) in whole
upon an Event of Loss with respect to such Aircraft if United has elected not
to replace such Aircraft under the applicable Lease or (iv) with respect to the
777 Aircraft, in part upon an Event of Loss with respect to an Engine under
certain circumstances set forth in Section 10(b) of the applicable Lease.
(Indentures, Sections 6.01, 6.02 and 8.03)
 
INDENTURE DEFAULTS, NOTICE AND WAIVER
 
  Indenture Defaults include: (i) the occurrence of any Lease Event of Default
under the applicable Lease, other than the failure to make certain indemnity
and certain other payments to the related Owner Trustee or Owner Participant,
(ii) failure to pay any interest or principal or premium, if any, when due,
continued for
 
                                      S-20
<PAGE>
 
more than 10 days after such amount shall have become due and payable, (iii)
failure by the related Owner Trustee, in its individual capacity or as Owner
Trustee, as the case may be, or the related Owner Participant to observe or
perform in any material respect certain covenants or obligations contained in
the applicable Indenture, Participation Agreement or Trust Agreement, or
failure by the related Owner Trustee or Owner Participant to observe or perform
any other covenant or obligation contained therein, which failure shall have a
material adverse effect on the rights and interests of the holders of the
Equipment Notes, and in either case, such failure is not remedied within a
period of 30 days after notice to the related Owner Trustee and Owner
Participant by the related Loan Trustee or the holders of at least 25% in
unpaid principal amount of outstanding Equipment Notes issued under such
Indenture, (iv) any representation or warranty made by the related Owner
Trustee or Owner Participant in the applicable Participation Agreement, Note
Purchase Agreement or Indenture, or in any document or certificate furnished to
the related Loan Trustee pursuant thereto being incorrect in any material
respect as of the date made and such incorrectness shall remain material and
continue unremedied for a period of 30 days after notice to such Owner Trustee
and Owner Participant by the related Loan Trustee or the holders of at least
25% in unpaid principal amount of outstanding Equipment Notes issued under such
Indenture, and (v) the occurrence of certain events of bankruptcy,
reorganization or insolvency of the related Owner Participant or Owner Trustee
or the property subject to the related Indenture. (Indentures, Section 8.01)
 
  There are no cross-default provisions in the Indentures and consequently an
Indenture Default under any particular Indenture will not in itself result in
an Indenture Default under any other Indenture.
 
  In the event United fails to make any semiannual basic rent payment when due,
and as long as no other Indenture Defaults (except a Lease Event of Default not
involving the nonpayment of money) under the related Indenture shall have
occurred and be continuing, within a specified period after such failure, the
related Owner Participant or Owner Trustee may furnish to the related Loan
Trustee an amount at least equal to the principal and interest then due but
unpaid under the related Equipment Notes, varying by Aircraft, together with
any interest thereon on account of the delayed payment thereof, in which event
such Loan Trustee and the holders of outstanding Equipment Notes issued under
such Indenture may not exercise any remedies otherwise available under such
Indenture or such Lease as the result of such failure to make such rental
payment, unless United has failed to make a basic rent payment when due on the
three consecutive immediately preceding semiannual basic rent payment dates or
on any six or more previous semiannual basic rent payment dates. The related
Owner Participant or Owner Trustee may also cure any other default by United in
the performance of its obligations under the applicable Lease that can be cured
by the payment of money. (Indentures, Section 8.03(e)(i))
 
  Each Indenture provides that the Loan Trustee thereunder shall, after the
occurrence of any event known to it to be an Indenture Default, promptly send
written notice thereof to United, the Owner Trustee and the applicable Owner
Participant, and within 90 days after the occurrence thereof, if such Indenture
Default remains uncured, mail notice thereof to the holders of outstanding
Equipment Notes issued under such Indenture, but such Loan Trustee may withhold
such notice, except in the case of a default in the payment of the principal,
interest or premium, if any, with respect to any such Equipment Notes, if it in
good faith determines that withholding such notice is in the interest of such
holders. (Indentures, Section 9.05)
 
  The holders of at least a majority in principal amount of the outstanding
Equipment Notes issued with respect to any Aircraft may, by notice to the Loan
Trustee, waive on behalf of all of the holders of such Equipment Notes any
existing event of default or default and its consequences under the Indenture
with respect to such Aircraft, except a default in the payment of the principal
or interest on any such Equipment Note or in respect of any covenant or
provision of such Indenture that cannot be modified or amended without the
consent of each holder of an Equipment Note affected thereby. (Indentures,
Sections 8.05 and 11.02)
 
  United is required to furnish annually to the Trustee a statement as to the
fulfillment of its covenants under the Basic Agreement, and to the Loan
Trustees a statement as to the fulfillment of its covenants under the Leases
during the preceding year. (Basic Agreement, Section 8.04(d); Leases, Section
16(c))
 
                                      S-21
<PAGE>
 
REMEDIES
 
  If an Indenture Default shall occur and be continuing under an Indenture, the
Loan Trustee thereunder or the holders of not less than 25% in unpaid principal
amount of the Equipment Notes outstanding under such Indenture may declare the
principal of all such Equipment Notes issued thereunder immediately due and
payable. The holders of a majority in unpaid principal amount of Equipment
Notes outstanding under such Indenture may annul any such declaration by such
Loan Trustee or by the holders at any time prior to the sale of the related
Aircraft after such an Indenture Default if (i) there has been paid to or
deposited with such Loan Trustee an amount sufficient to pay all overdue
installments of principal and interest on any such Equipment Notes that have
become due otherwise than by such declaration of acceleration and any interest
thereon and overdue installments of interest and certain expenses, (ii) such
annulment would not conflict with any judgment or decree and (iii) all other
existing Indenture Defaults under such Indenture have been cured or waived
(other than nonpayment of principal of, or interest on, the Equipment Notes
that has become due solely because of such acceleration). (Indentures, Section
8.02)
 
  Each Indenture provides that if an Indenture Default has occurred and is
continuing, the Loan Trustee thereunder may exercise certain rights or remedies
available to it under applicable law, including (if a Lease Event of Default
under the related Lease has occurred and is continuing) one or more of the
remedies with respect to the related Aircraft afforded to the applicable Owner
Trustee by the related Lease for Lease Events of Default thereunder. Such Loan
Trustee's right to exercise remedies under such Indenture is subject, in
certain circumstances, to its having exercised or its concurrent exercise of
certain remedies under Section 15 of the related Lease with respect to the
related Aircraft, provided that the requirement to exercise such remedies under
such Lease shall not apply in circumstances where such exercise has been
involuntarily stayed or prohibited by applicable law or court order for a
continuous period in excess of 60 days or such other period as may be specified
in section 1110(a)(1)(A) of the Bankruptcy Code (as defined below) (plus an
additional period, if any, resulting from (i) United or its trustee in
bankruptcy in such proceeding assuming, or agreeing to perform its obligations
under, such Lease with the approval of the applicable court or such Loan
Trustee's consent to an extension of such period or (ii) such Loan Trustee's
failure to give any requisite notice). See "The Leases--Events of Default" in
this Prospectus Supplement. Such remedies may be exercised by such Loan Trustee
to the exclusion of such Owner Trustee and, subject to the terms of such Lease,
United. Any Aircraft sold in the exercise of such remedies will be free and
clear of any rights of those parties, including the rights of United under the
related Lease; provided that no exercise of any remedies by a Loan Trustee may
affect the rights of United under the related Lease unless a Lease Event of
Default thereunder has occurred and is continuing. (Indentures, Section 8.03)
 
  Section 1110 of title 11 of the United States Code (the "Bankruptcy Code")
provides in part that the right of a lessor of aircraft, aircraft engines,
propellers, appliances or spare parts, as defined in Section 40102 of the
Aviation Act, that are subject to a lease to an air carrier that is a citizen
of the United States (as defined in Section 40102 of the Aviation Act)
operating under an air carrier operating certificate issued by the Secretary of
Transportation pursuant to Chapter 447 of the Aviation Act for aircraft capable
of carrying 10 or more individuals or 6,000 pounds or more of cargo to take
possession of such equipment in compliance with the provisions of such lease is
not affected by (i) the automatic stay provision of the Bankruptcy Code, which
provision enjoins repossessions by creditors for the duration of the
reorganization period, (ii) the provision of the Bankruptcy Code allowing the
debtor in possession and/or the bankruptcy trustee to use property of the
bankruptcy estate during the reorganization period, (iii) the provision of the
Bankruptcy Code allowing the proponent of a plan of reorganization to confirm
such plan by imposing the plan upon a class of claims or interests that has not
accepted or is impaired by such plan and (iv) any power of the bankruptcy court
to enjoin a repossession. Section 1110 provides, however, that the right of a
lessor to take possession of an aircraft in the event of an event of default
may not be exercised for 60 days following the date of the order for relief
(unless specifically permitted by the bankruptcy court) and may not be
exercised at all if, within such 60-day period, the debtor in possession and/or
the bankruptcy trustee 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).
 
                                      S-22
<PAGE>
 
  United has been advised by its counsel, Vedder, Price, Kaufman & Kammholz,
that in its opinion each Owner Trustee, as lessor under the related Lease, and
the related Loan Trustee, 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.
 
  The opinion of Vedder, Price, Kaufman & Kammholz does not address the
possible replacement of an Aircraft after an Event of Loss in the future, the
consummation of which is conditioned upon the contemporaneous delivery of an
opinion of counsel to the effect that the Loan Trustee shall continue to be
entitled to the benefits of section 1110 with respect to such replacement. See
"The Leases--Events of Loss" in this Prospectus Supplement.
 
  The holders of a majority in principal amount of the Equipment Notes
outstanding under any Indenture may direct the time, method and place of
conducting any proceeding for any remedy available to the related Loan Trustee
or of exercising any trust or power conferred on such Loan Trustee but in such
event such Loan Trustee shall be entitled to be indemnified by the holders of
such Equipment Notes before proceeding so to act and such Loan Trustee may not
be held liable for any such action taken in good faith. The Loan Trustee may,
in certain circumstances, refuse to follow such a direction. (Indentures,
Sections 8.06, 9.01 and 9.02)
 
  The right of any holder of Equipment Notes to institute action for any remedy
under the Indenture pursuant to which such Equipment Notes are issued (except
the right to enforce payment of the principal, interest and premium, if any,
with respect to its Equipment Notes when due) is subject to certain conditions
precedent, including a request to the related Loan Trustee by the holders of
not less than 25% in principal amount of such Equipment Notes outstanding to
take action and an offer to such Loan Trustee of satisfactory indemnification
against liabilities incurred by it in so doing. (Indentures, Sections 8.07 and
8.08)
 
  If an Indenture Default occurs and is continuing, any sums held or received
by the related Loan Trustee may be applied to reimburse such Loan Trustee for
any tax, expense or other loss incurred by it and to pay any other amounts due
to such Loan Trustee prior to any payments to holders of the Equipment Notes
issued under such Indenture. (Indentures, Section 3.05)
 
  In the event of insolvency proceedings involving an Owner Participant, the
related Aircraft, Lease and Equipment Notes might become part of such
insolvency proceeding. In such event, payments under such Lease or on such
Equipment Notes might be interrupted and the ability of the related Loan
Trustee to exercise its remedies under the applicable Indenture might be
restricted, although such Loan Trustee would retain its status as a secured
creditor in respect of such Lease and Aircraft.
 
MODIFICATION OF INDENTURES, LEASES AND PARTICIPATION AGREEMENTS
 
  Without the consent of holders of a majority in principal amount of the
Equipment Notes outstanding under any Indenture, the provisions of such
Indenture and the Lease and the Participation Agreement corresponding thereto
may not be amended or modified, except to the extent indicated below.
 
  Certain provisions of any Indenture, and of the Lease, the Trust Agreement
and the Participation Agreement corresponding thereto, may be modified by the
parties thereto without the consent of any holders of the Equipment Notes
outstanding under such Indenture. In the case of each Lease, such provisions
include, among others, provisions relating to (i) rental payments and other
payments, except to the extent that any such modification would cause the
amount of such payments to be insufficient to pay the principal, interest and
premium, if any, with respect to the related Equipment Notes, (ii) the return
to the Owner Trustee thereunder of the related Aircraft at the end of the term
of such Lease and (iii) the renewal of such Lease and the option of United at
the end of the term of such Lease to purchase the related Aircraft.
(Indentures, Sections 11.01 and 11.06)
 
                                      S-23
<PAGE>
 
  Without the consent of the holder of each Equipment Note outstanding under
any Indenture affected thereby, no amendment or modification of such Indenture
may (i) reduce the principal amount, premium, if any, or any payment of
interest due on any Equipment Note issued thereunder, (ii) change the date on
which any payment of principal, premium, if any, or interest is due or payable
on any Equipment Note issued thereunder, (iii) create any lien with respect to
the property subject to the lien of such Indenture ranking prior to or on a
parity with the lien created by such Indenture or deprive any holder of an
Equipment Note issued thereunder of the lien of such Indenture upon the
property subject thereto, (iv) reduce the percentage in principal amount of
outstanding Equipment Notes issued thereunder necessary to modify or amend any
provision of such Indenture or to waive compliance therewith or (v) modify any
of the provisions relating to the rights of holders in respect of the waiver of
defaults or events of default or receipt of payment. (Indentures, Section
11.02)
 
THE LEASES
 
  Each Aircraft has been leased by the related Owner Trustee under the related
Lease to United.
 
  Term and Rentals. Each Aircraft has been leased separately by the related
Owner Trustee to United for a term commencing on the delivery date thereof to
the related Owner Trustee and expiring on a date not earlier than the latest
maturity date of the related Equipment Notes, unless previously terminated as
permitted by the related Lease. The semiannual basic rent payments under each
Lease are payable by United on each January 30 and July 30 (or, if such day is
not a Business Day, on the next succeeding Business Day) and has been assigned
by the Owner Trustee under the corresponding Indenture to provide the funds
necessary to make payments of principal and interest due from the Owner Trustee
on the Equipment Notes issued under the Indenture corresponding to such Lease.
In certain cases, the semiannual basic rent payments under the Leases will be
adjusted, but each Lease provides that under no circumstances will rent
payments by United be less than the scheduled payments on the related Equipment
Notes. The balance of any such semiannual basic rent payment under the Leases,
after payment of amounts due on the Equipment Notes issued under the Indenture
corresponding to such Lease and any amounts due to the applicable Loan Trustee
as compensation or indemnification, will be paid over to the applicable Owner
Participant. United's obligation to pay rent and to cause other payments to be
made under the Leases is a general obligation of United. (Leases, Section 3;
Indentures, Section 3.03)
 
  Net Lease. United's obligations in respect of each of the Aircraft are those
of a lessee under a "net lease". Accordingly, United is obligated, at its
expense, to cause each Aircraft to be duly registered in the name of the
applicable Owner Trustee, to pay all costs of operating each Aircraft and to
maintain, service, repair and overhaul (or cause to be maintained, serviced,
repaired and overhauled) each Aircraft (i) so as to keep it in at least as good
operating condition as when delivered to United, ordinary wear and tear
excepted, and in such condition as may be necessary to enable the airworthiness
certification thereof to be maintained in good standing at all times (other
than during temporary periods of storage in accordance with applicable
regulations) under the Aviation Act except when all of United's aircraft of the
same model as such Aircraft registered in the United States have been grounded
by the Federal Aviation Administration (unless, with respect to the 747
Aircraft, such grounding was caused by United's failure to maintain, service,
repair or overhaul the 747 Aircraft in accordance with the terms of the related
Lease) or, if the Aircraft is registered in a foreign jurisdiction, except when
all United's aircraft of the same model as such Aircraft registered in such
foreign jurisdiction have been grounded by the aeronautical authority in such
jurisdiction (unless, with respect to the 747 Aircraft, such grounding was
caused by United's failure to maintain, service, repair or overhaul the 747
Aircraft in accordance with the terms of the related Lease) and (ii) in
substantially the same manner in which United, or, in the event of a sublease,
such sublessee, maintains, services, repairs or overhauls similar aircraft
operated by United (or such sublessee) in similar circumstances and without in
any way discriminating against such Aircraft, whether by reason of its leased
status or otherwise (or, in the case of the 777 Aircraft, in such other manner
as has been approved by the related Owner Participant). (Leases, Section 7(a))
United will, at its expense, replace or cause to be replaced all parts (other
than certain severable parts added at the option of United and obsolete or
unsuitable parts that United is permitted to remove to the extent described
below) that may from time to time be incorporated or installed in or attached
to either Aircraft or which have been removed therefrom but where
 
                                      S-24
<PAGE>
 
title remains vested in the related Owner Trustee in accordance with the terms
of the related Lease and that may become worn out, lost, stolen, destroyed,
seized, confiscated, damaged beyond repair or rendered permanently unfit for
use. (Leases, Section 8(a)) United or any sublessee has the right, at its own
expense, to make such alterations, modifications and additions (including
removal of parts which United or any sublessee claims to be obsolete or no
longer suitable or appropriate for use) with respect to each Aircraft as United
or such sublessee deems desirable in the proper conduct of its business,
provided that no such alteration, modification, removal or addition shall
diminish (or, in the case of the 747 Aircraft, shall materially diminish) the
value or utility (or, in the case of the 777 Aircraft, with respect to the
related airframe and Engines, remaining useful life) of such Aircraft or impair
the condition or airworthiness thereof. In addition to the foregoing, the value
(but not the utility, or, in the case of the 777 Aircraft, the condition,
airworthiness or remaining useful life) of an Aircraft may be reduced by the
value of parts that United deems obsolete or no longer suitable or appropriate,
provided that the aggregate value of all such parts removed from an Aircraft
and not replaced shall not exceed $600,000 in the case of the 747 Aircraft and
$700,000 in the case of the 777 Aircraft. (Leases, Section 8(c))
 
  Registration, Possession, Sublease and Transfer. United may, under certain
circumstances, after the date specified in the related Lease (the earliest of
which for either Aircraft is January 1, 2002) register an Aircraft in certain
jurisdictions outside the United States. United may, subject to certain
limitations, sublease an Aircraft to any United States certificated air carrier
or to certain foreign air carriers (such United States and foreign air carriers
being the "Permitted Air Carriers") or to any other entity approved by the
related Owner Participant, so long as the term of the sublease does not extend
beyond the end of the basic term or any renewal term (or, in the case of the
777 Aircraft, beyond the date three months prior to the end of the basic term
or any renewal term) then in effect under the Lease to which such Aircraft is
subject unless United shall have irrevocably committed to purchase such
Aircraft or renew such Lease in accordance with the terms thereof at the end of
the basic term or renewal term, as the case may be, to a date beyond the term
of the sublease (or, in the case of the 777 Aircraft, to a date at least three
months beyond the term of the sublease). In addition, subject to certain
limitations, United may transfer possession of an Aircraft other than by
sublease, including transfers in connection with normal interchange or pooling
arrangements (in the case of the 777 Aircraft, with Permitted Air Carriers or
other carriers approved by the Owner Trustee), "wet leases", transfers to the
United States of America or any instrumentality or agency thereof and transfers
in connection with maintenance or modifications. If an Aircraft is subleased or
the possession thereof is otherwise transferred, such Aircraft will remain
subject to the related Lease and to the lien of the related Indenture. (Leases,
Sections 7(a) and 7(b)) An Aircraft may be operated by United or under sublease
or interchange arrangements or may be registered in countries that are not
parties to the Geneva Convention for the International Recognition of Rights in
Aircraft, and the extent to which the related Loan Trustee's security interest
would be recognized in such Aircraft if located in such countries is uncertain.
 
  Liens. United will maintain each Aircraft free of any liens, other than the
rights of the applicable Owner Participant, Owner Trustee, Loan Trustee, the
holders of the related Equipment Notes and United arising under the Trust
Agreement, the Lease, the Indenture, the Participation Agreement or other
documents related thereto, and other than certain limited liens permitted under
such related Lease and related Indenture, including liens for taxes either not
yet due and payable or being contested in good faith by appropriate proceedings
so long as such proceedings do not involve any material risk of the sale,
forfeiture or loss of such Aircraft or any interest therein; materialmen's,
mechanics' and other similar liens arising in the ordinary course of business
securing obligations that are either not overdue for more than 30 days or being
contested in good faith by appropriate proceedings so long as during such
period there is not, nor do such proceedings involve, any material risk of the
sale, forfeiture or loss of such Aircraft or any interest therein; judgment
liens, unless the judgment secured shall not, within 45 (or, with respect to
the 777 Aircraft, 30) days after the entry thereof, have been discharged,
vacated, reversed or execution thereof stayed pending appeal (and, with respect
to the 747 Aircraft, so long as during such 45-day period there exists no
material risk of the sale, forfeiture or loss of such Aircraft or any interest
therein); or liens with respect to which United or any sublessee shall have
posted a bond or other security; and certain liens required to be removed by
the related Owner Trustee or Owner Participant. (Leases, Section 6;
Participation Agreements, Section 8(g))
 
                                      S-25
<PAGE>
 
  Insurance. United will, at its or any sublessee's expense, maintain or cause
to be maintained all-risk aircraft hull insurance covering each Aircraft and
fire and extended coverage (including war risk, governmental confiscation and
hijacking insurance, if and to the extent the same is maintained by United or
any sublessee with respect to other aircraft owned or leased, and operated by
United or such sublessee on the same routes) at all times in an amount not less
than the stipulated loss value of such Aircraft (which will be an amount at
least equal to the aggregate unpaid principal of, together with all unpaid
interest accrued on, the outstanding Equipment Notes related to such Aircraft).
During any period when an Aircraft is on the ground and not in operation,
United may carry or cause to be carried in lieu of the insurance required by
the previous sentence, insurance otherwise conforming with the provisions of
said sentence except that the scope of the risks covered and the type of
insurance shall be the same as are from time to time applicable to aircraft
owned or leased by United of the same type as such Aircraft similarly on the
ground and not in operation, in an amount at least equal to the stipulated loss
value of such Aircraft. All policies covering loss of or damage to an Aircraft
shall be made payable to the applicable Loan Trustee for any loss in excess of
that certain amount specified in the applicable Lease, the highest of which
under either Lease is $4,000,000. United may self-insure a portion of these
risks, but in no case will the self-insurance with respect to all of the
aircraft in United's fleet (including the Aircraft) exceed, for any calendar
year, the lesser of 50% of the highest replacement value of any single aircraft
in United's fleet or 1 1/2% of the average aggregate insurable value (during
the preceding calendar year) of all aircraft on which United carries insurance.
In addition, United will, at its or any sublessee's expense, carry or cause to
be carried comprehensive airline liability (including, without limitation,
passenger, contractual, bodily injury and property damage liability) insurance
(exclusive of manufacturer's product liability insurance) and cargo liability
insurance with respect to each Aircraft (i) in amounts that are not less than
the greater of the comprehensive airline liability insurance as is from time to
time applicable to aircraft owned or leased, and operated by United of the same
type as such Aircraft, and not less than $450,000,000 per occurrence, varying
by Aircraft, and (ii) of the types and covering the same risks as are from time
to time applicable to aircraft owned or leased, and operated, by United of the
same type as such Aircraft and which is maintained in effect with insurers of
recognized reputation and responsibility, provided that United need not
maintain cargo liability insurance, or may maintain such insurance in an amount
less than that specified above for the respective Aircraft as long as the
amount of cargo liability insurance, if any, maintained with respect to such
Aircraft is the same as the cargo liability insurance, if any, maintained for
other aircraft of the same model as such Aircraft owned or leased, and operated
by United. During any period when an Aircraft is on the ground and not in
operation, United may carry or cause to be carried in lieu of the insurance
required by the previous sentence, insurance otherwise conforming with the
provisions of said sentence except that the amounts of coverage shall not be
required to exceed the amounts of comprehensive airline liability insurance,
and the scope of risks covered and type of insurance shall be the same, as are
from time to time applicable to aircraft owned or leased by United of the same
type as such Aircraft similarly on the ground and not in operation. United may
also self-insure a portion of these risks subject to the same limitations
described above for insurance for risks of loss of or damage to the Aircraft.
The Trustee, each related Loan Trustee, Owner Participant and Owner Trustee, in
its individual capacity and as owner of the Aircraft, and United will be named
as insured parties under all insurance policies required with respect to the
related Aircraft. In addition, the insurance policies maintained under the
Lease with respect to each Aircraft will provide that, in respect of the
respective interests of the Trustee, the Loan Trustee, the Owner Participant
and the Owner Trustee relating to such Aircraft, the insurance shall not be
invalidated by any action or inaction of United or any sublessee or any other
entity and shall insure the respective interests of the Trustee, the Loan
Trustee, the Owner Participant and the Owner Trustee relating to such Aircraft,
as they appear, regardless of any breach or violation of any warranty,
declaration or condition contained in such policies by United (or any sublessee
or any other entity). Subject to certain limited exceptions, United may not
operate or permit any sublessee or any other entity to operate either Aircraft
in or to any area excluded from coverage by any insurance required by the
related Lease (or, in the case of the 777 Aircraft, to a country with which the
United States does not have diplomatic relations) unless the United States
government or any agency or instrumentality thereof provides indemnification or
insurance in lieu of such insurance coverage. (Leases, Sections 7(a) and 11)
 
                                      S-26
<PAGE>
 
  Termination. Unless one or more of certain defaults or Lease Events of
Default shall have occurred and be continuing, United may terminate the related
Lease on the third Business Day prior to the Regular Distribution Dates
occurring on or after the date specified in the related Lease (the earliest of
which is December 31, 2001) if it shall have determined that such Aircraft is
surplus to its requirements or economically obsolete to it. United is required
to give notice of its intention to exercise its right of termination described
in this paragraph at least 120 days, varying by Aircraft, prior to the proposed
date of termination (which notice may be withdrawn in certain circumstances up
to 30 days and not more than 360 days prior to such proposed date). In the
event that the applicable Owner Trustee elects to sell such Aircraft, United
shall use reasonable efforts to obtain bids for such Aircraft as an agent for
such Owner Trustee; the applicable Owner Participant may submit bids for such
Aircraft. The applicable Owner Trustee shall sell such Aircraft on the date of
termination to the highest cash bidder; if such sale occurs, the Equipment
Notes related thereto will be redeemed as described herein. The net proceeds of
such sale shall be payable to the applicable Owner Trustee. If the net proceeds
to be received from such sale are less than the termination value for such
Aircraft, United shall pay to the applicable Owner Trustee an amount equal to
the difference between such net proceeds and termination value, together with
certain other amounts. All funds to be paid to or deposited with the applicable
Owner Trustee as described in this paragraph shall, so long as the related
Indenture shall not have been discharged, be deposited directly with the
applicable Loan Trustee. Upon receipt of the termination value for such
Aircraft, together with certain additional amounts and together with all
accrued and unpaid interest thereon to the date of the related redemption and
an amount equal to the premium, if any, payable on such date of redemption, the
lien of the related Indenture shall be released and the related Lease shall
terminate with respect to such Aircraft, and the obligation of United
thereafter to make scheduled rent payments with respect thereto shall cease.
However, certain payment obligations of United shall survive the termination of
the Lease. Amounts in excess of the aggregate payments to be made in connection
with the redemption of Equipment Notes issued with respect to such Aircraft
will be distributed by the Loan Trustee related thereto to the applicable Owner
Trustee for distribution in accordance with the terms of the related Lease,
Participation Agreement and Trust Agreement. In the event such Aircraft is not
sold by the proposed termination date, such Lease, including all of United's
obligations thereunder, shall continue in effect, and the Equipment Notes
related thereto will not be redeemed. (Leases, Sections 9(b) and 9(c);
Indentures, Sections 3.02, 6.01(b) and 13.01)
 
  The related Owner Trustee has the option in certain circumstances to retain
title to the related Aircraft in the event United has given a notice of
termination under the related Lease. In such event, such Owner Trustee shall
pay, or cause to be paid, to the applicable Loan Trustee funds in an amount
necessary to redeem the outstanding Equipment Notes issued with respect to such
Aircraft determined in accordance with the preceding paragraph (other than
unpaid basic rent and supplemental rent due on or prior to the proposed
redemption date (other than basic rent payable in advance on such redemption
date) and amounts payable in respect of any premium on such Equipment Notes,
which amounts shall be payable by United). In the event all such amounts are
not paid to such Loan Trustee, such Lease will not terminate, and the Equipment
Notes related thereto will not be redeemed. (Leases, Section 9)
 
  Renewal and Purchase Options. At the end of the term of each Lease after
final maturity of the Equipment Notes issued with respect thereto, in the
absence of certain defaults or any Lease Event of Default thereunder, United
will have certain options to renew such Lease for additional limited periods.
In addition, United will have the right at the end of the term of such Lease to
purchase the Aircraft subject thereto for an amount to be calculated in
accordance with the terms of such Lease. (Leases, Section 19)
 
  United will also have the option, exercisable upon 120 days to 360 days'
written notice, varying by Aircraft, to purchase either Aircraft on certain
specified dates, the earliest of which is July 30, 2008. In the event United
exercises such an option, the purchase price therefor shall be calculated in
accordance with the provisions of the Lease related thereto, but in any event
shall be sufficient to pay the redemption price of the
 
                                      S-27
<PAGE>
 
related Equipment Notes and, upon receipt by the related Loan Trustee of such
redemption price, United shall acquire the Aircraft free of the lien of such
Indenture, unless United chooses to assume on a full recourse basis all of such
Owner Trustee's obligations in respect of the related Equipment Notes and
acquires the Aircraft subject to the lien of the related Indenture. See
"Description of the Equipment Notes--Assumption of Obligations by United" in
this Prospectus Supplement. (Leases, Section 19; Indentures, Section 7.03;
Participation Agreements, Section 8(r) with respect to the 747 Aircraft and
Section 8(l) with respect to the 777 Aircraft)
 
  Events of Loss. If an Event of Loss occurs with respect to an Aircraft,
United shall either pay to the applicable Owner Trustee the stipulated loss
value of such Aircraft, together with certain additional amounts, or, unless
certain defaults or any Lease Event of Default shall have occurred and be
continuing, replace such Aircraft. In the event United elects to replace such
Aircraft, it must do so on or before the Business Day next succeeding the 100th
day following the date of occurrence of such Event of Loss with an aircraft of
the same make and model or an improved model, having a value, utility and
remaining useful life at least equal to, and in as good operating condition as,
the Aircraft subject to the Event of Loss, assuming for this purpose that such
Aircraft had been maintained in accordance with the related Lease immediately
prior to the occurrence of the Event of Loss. If United pays the stipulated
loss value for such Aircraft, together with certain additional amounts, which
in all circumstances will be at least sufficient to pay in full as of the date
of payment thereof the redemption price of the related Equipment Notes, the
lien of the Indenture and the Lease relating to such Aircraft shall terminate
with respect to such Aircraft and the obligation of United thereafter to make
the scheduled rent payments with respect thereto shall cease. The stipulated
loss value and other payments made by United shall be deposited with the
applicable Loan Trustee. Amounts in excess of the redemption price of the
Equipment Notes issued with respect to such Aircraft will be distributed by
such Loan Trustee to the applicable Owner Trustee in accordance with the terms
of the applicable Lease, Trust Agreement and Participation Agreement. (Leases,
Section 10(a); Indentures, Sections 3.02 and 6.01)
 
  If an Event of Loss occurs with respect to an Engine alone, United shall,
within 45 days after the occurrence of such Event of Loss, replace such Engine
with another engine of the same or another manufacturer and suitable for
installation and use on the Aircraft, and having a value and utility at least
equal to, and in as good operating condition (and, with respect to the 777
Aircraft, have an equivalent or greater useful remaining life) as the engine
subject to the Event of Loss, assuming for this purpose that such Engine had
been maintained in accordance with the related Lease immediately prior to the
occurrence of such Event of Loss; provided that, with respect to the 777
Aircraft, under certain circumstances, United shall pay stipulated loss value
with respect to such Engine, together with certain additional amounts, which in
all circumstances will be at least sufficient to pay in full the redemption
price with respect to that portion of the Equipment Notes relating to such
Engine and, in such event, the lien of the Indenture and the Lease relating to
such Engine shall terminate with respect to such Engine and United shall only
be obligated to return the related Aircraft with any Engine for which United
has not paid the stipulated loss value described above. (Leases, Section 10(b);
Indentures, Sections 6.01 and 13.01)
 
  An Event of Loss with respect to an Aircraft or any Engine relating thereto
means any of the following events with respect to such property: (i) loss of
such property or the use thereof due to destruction of or damage to such
property which renders repair uneconomic or which renders such property
permanently unfit for normal use by United for any reason whatsoever; (ii) any
damage to such property which results in an insurance settlement with respect
to such property on the basis of a total loss or a constructive or compromised
total loss; (iii) the theft or disappearance of such property for a period of,
in the case of the 747 Aircraft, 90 consecutive days or, in the case of the 777
Aircraft, 30 consecutive days or, if earlier, until the end of the applicable
Lease term (or, in the case of the 777 Aircraft, when United shall no longer be
diligently attempting to locate and pursue the return of such property); (iv)
the condemnation, confiscation or seizure of, or requisition or taking of title
to, or use of, such property by any governmental or purported governmental
authority (other than a requisition for use by certain permitted governments or
any agency or instrumentality thereof), which in the case of any event referred
to in this clause (iv) shall have resulted in a loss of title to, or possession
of, such property by United for a period in excess of 90 consecutive days
(except that, in the case
 
                                      S-28
<PAGE>
 
of a loss of title relating to the 777 Aircraft, such period shall be in excess
of 45 consecutive days) or, if earlier, until the end of the applicable Lease
term; (v) as a result of any law, rule, regulation, order or other action by
the Federal Aviation Administration or other governmental body of the
government of registry of such Aircraft having jurisdiction, use of such
property in the normal course of the business of air transportation shall have
been prohibited for a period in excess of, in the case of the 747 Aircraft, 180
consecutive days or, in the case of the 777 Aircraft, 120 consecutive days or,
if earlier, until the end of the term of the Lease in effect with respect to
such Aircraft unless United, prior to the expiration of such period, shall have
undertaken and shall be diligently carrying forward all steps which are
necessary or desirable to permit the normal use of such property by United
(but, with respect to the 777 Aircraft, in any event if such use shall have
been prohibited for a period of one year) and, with respect to the 747
Aircraft, (a) such prohibition is applicable to United's entire fleet of
aircraft of the same model as the Aircraft registered in the same country and
(b) United, within one year from the time of such prohibition, shall have
conformed at least one such aircraft in its fleet to the requirements of such
law, rule, regulation, order or other action and commenced regular commercial
use of the same in such jurisdiction; (vi) the requisition of such property for
use by the United States government or any government of registry of the
Aircraft or any agency or instrumentality thereof, which shall have occurred
during the term of the Lease in effect with respect to such property and, with
respect to a requisition by the United States government or any agency or
instrumentality thereof, shall have continued beyond the term (or, with respect
to the 777 Aircraft, shall have continued for 30 days beyond the term) of the
Lease in effect with respect to such property, and the related Owner Trustee
shall not have furnished the written notice specified in such Lease or, with
respect to any government of registry other than the United States or any
agency or instrumentality thereof, shall have continued for more than two years
(or, if earlier, until the end of the applicable Lease term); (vii) any
divestiture of title to an Engine treated as an Event of Loss pursuant to the
Lease in effect with respect to such Aircraft; or (viii) with respect to the
747 Aircraft, the operation of or location of the Aircraft, while under
requisition for use by any government, in any area excluded from coverage by
any insurance policy in effect with respect to the Aircraft required by the
terms of the applicable Lease, unless in the case of a requisition by certain
permitted governments or any agency or instrumentality thereof, Lessee shall
have obtained an indemnity in lieu thereof from such government. (Leases,
Section 1)
 
  Events of Default. Events of Default under the Leases (each, a "Lease Event
of Default") include, among other things: (i) failure by United to make any
payment of basic rent, termination value, stipulated loss value or premium
within 10 days after the same shall have become due; (ii) failure by United to
make any payment of supplemental rent not specified in clause (i) after the
same shall have become due and such failure shall continue for 15 days after
receipt of written demand therefor; (iii) failure by United to carry and
maintain or cause to be carried or maintained insurance or, in certain
instances, government indemnities, on or with respect to the Aircraft subject
to such Lease in accordance with the provisions of the applicable Lease; (iv)
failure by United to perform or observe (or cause to be performed or observed)
in any material respect any other covenant or agreement to be performed or
observed by it under such Lease or the related Participation Agreement or
Indenture, and such failure shall continue for a period of 30 days after
written notice by the applicable Owner Trustee or Loan Trustee, provided,
however, that if United shall have undertaken to cure such failure (except
that, with respect to the 777 Aircraft, United shall have the right to cure
only certain of such failures) and, notwithstanding the reasonable diligence of
United in attempting to cure such failure, such failure is not cured within
said 30-day period but is curable with future due diligence, there shall exist
no Lease Event of Default so long as United is proceeding with due diligence to
cure such failure and such failure is in fact cured within 180 days (and, with
respect to the 777 Aircraft, provided further that such failure to cure shall
not constitute a Lease Event of Default upon the satisfaction of certain
conditions, including (A) the provision by United of an officer's certificate
with respect to the program and timetable for curing such failure, (B) in the
event the estimated costs to cure such failure equal or exceed $2,000,000, the
establishment of a reserve account for such amounts and (C) such failure is
cured within one full year after such 180-day period); (v) any representation
or warranty made by United in such Lease or the related Participation Agreement
or in any document or certificate furnished by United in connection therewith
or pursuant thereto (except for certain representations and warranties relating
to the corresponding tax indemnity agreement)
 
                                      S-29
<PAGE>
 
shall be incorrect in any material respect at the time made and shall remain
material at the time in question and shall continue uncured for a period of 30
days after receipt by United of written notice from the applicable Owner
Trustee or Loan Trustee (or, with respect to the 777 Aircraft, 30 days after
the earlier of (A) receipt by United of written notice from the applicable
Owner Trustee or Loan Trustee or (B) knowledge of such incorrectness by a
responsible finance officer of United); and (vi) the occurrence of certain
events of bankruptcy, reorganization or insolvency of United. (Leases, Section
14)
 
  If a Lease Event of Default has occurred and is continuing, and the
applicable Lease has been declared to be in default, the applicable Loan
Trustee may, subject to the terms of the applicable Indenture, exercise one or
more of the remedies provided in such Lease with respect to the related
Aircraft. These remedies include the right to repossess and use or operate such
Aircraft, to sell or re-lease such Aircraft free and clear of United's rights
and retain the proceeds and to require United to pay as liquidated damages any
unpaid basic rent plus an amount equal to, at such Loan Trustee's option, any
of (i) an amount equal to the excess of the aggregate unpaid basic rent
(discounted to present value) over the aggregate fair market rental value
(discounted to present value) of the Aircraft for the remainder of the
applicable Lease term, (ii) an amount equal to the excess of the stipulated
loss value of the relevant Aircraft over the fair market sales value of such
Aircraft or (iii) if such Aircraft has been sold, any unpaid basic rent with
respect to the Aircraft plus the amount of any deficiency between the net
proceeds of such sale and the stipulated loss value of the Aircraft. (Leases,
Section 15; Indentures, Section 8.03)
 
  Notwithstanding that a Lease Event of Default has occurred and is continuing,
the applicable Loan Trustee may not, without the consent of the related Owner
Trustee, enter into any amendment of the provisions of such Lease relating to,
among other things, the timing and amount of payments by United under such
Lease, defaults under such Lease or maintenance of insurance on, modifications
or additions to, or sublease, registration, maintenance, operation, return,
inspection or purchase of, such Aircraft. (Indentures, Section 11.06)
 
THE PARTICIPATION AGREEMENTS
 
  Each Participation Agreement provides that United is required to indemnify
the Trustee, the respective Loan Trustee, Owner Participant and Owner Trustee
for certain losses and claims and for certain other matters. (Participation
Agreements, Section 7(c)). Subject to certain restrictions, each Owner
Participant may transfer its interest in the related Aircraft. (Participation
Agreements, Section 8(l) with respect to the 747 Aircraft and Section 8(h) with
respect to the 777 Aircraft)
 
DEFEASANCE OF THE INDENTURES AND THE EQUIPMENT NOTES IN CERTAIN CIRCUMSTANCES
 
  Each Indenture provides that the obligations thereunder of the related Loan
Trustee and Owner Trustee 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 amount sufficient to pay when due (including as a
consequence of redemption (in respect of which no premium is payable) in
respect of which irrevocable notice is given on or prior to the date of such
deposit) principal and interest with respect to 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
 
                                      S-30
<PAGE>
 
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. (Indentures, Sections 10.01 and 10.02)
 
  Upon such a defeasance, or upon payment in full of the principal, interest
and premium, if any, with respect to all Equipment Notes issued under such
Indenture or deposit with the applicable Loan Trustee of money sufficient
therefor no earlier than one year prior to the maturity or redemption thereof,
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 the Indenture and such lien shall terminate. (Indentures, Sections
10.01 and 13.01)
 
ASSUMPTION OF OBLIGATIONS BY UNITED
 
  Upon the voluntary termination of a Lease in connection with the exercise by
United of any of its purchase options prior to the end of the term of such
Lease, United 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
related Indenture, including the obligations to make payments with respect to
the Equipment Notes. In such event, certain relevant provisions of the 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 Equipment Notes issued under such
Indenture will not be redeemed and will continue to be secured by such
Aircraft. In addition, in certain circumstances United may pay in installments
the portion of the purchase price for such Aircraft which is distributable to
the Owner Participant and United's obligations to pay such installments may be
secured by a lien on such Aircraft, which lien will be subject to the prior
rights of the holders of the related Equipment Notes as provided in the
Participation Agreement. It is a condition to such assumption that an opinion
of counsel be delivered at the time of such assumption substantially to the
effect that the Loan Trustee under such Indenture would, 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 with respect to an Aircraft 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. (Leases, Section 19(b); Indentures, Section 7.03;
Participation Agreements, Section 8(r) with respect to the 747 Aircraft and
Section 8(l) with respect to the 777 Aircraft)
 
                        FEDERAL INCOME TAX CONSEQUENCES
 
  Prospective investors should consult the section "Federal Income Tax
Consequences" in the Prospectus for a discussion of the anticipated material
federal income tax consequences of the purchase, ownership and disposition of
Certificates.
 
                               CERTAIN UTAH TAXES
 
  Ray, Quinney & Nebeker, counsel to the Trustee, has advised United that, in
its opinion, under currently applicable law, assuming that the Trusts will not
be taxable as corporations, but, rather, will be classified as grantor trusts
under subpart E, Part I of Subchapter J of the Code, (i) the Trusts will not be
subject to any tax (including, without limitation, net or gross income,
tangible or intangible property, net worth, capital, franchise or doing
business tax), fee or other governmental charge under the laws of the State of
Utah or any political subdivision thereof and (ii) Certificate Owners that are
not residents of or otherwise subject to tax in the State of Utah will not be
subject to any tax (including, without limitation, net or gross income,
tangible or intangible property, net worth, capital, franchise or doing
business tax), fee or other governmental charge under the laws of the State of
Utah or any political subdivision thereof as a result of purchasing, holding
 
                                      S-31
<PAGE>
 
(including receiving payments with respect to) or selling a Certificate.
Neither the Trusts nor the Certificate Owners will be indemnified for any state
or local taxes imposed on them, and the imposition of any such taxes on a Trust
could result in a reduction in the amounts available for distribution to the
Certificate Owners of such Trust. In general, should a Certificate Owner or a
Trust be subject to any state or local tax which would not be imposed if the
Trustee were located in a different jurisdiction in the United States, the
Trustee will resign and a new Trustee in such other jurisdiction will be
appointed.
 
                              ERISA CONSIDERATIONS
 
  Employee benefit plans subject to Title I of the Employee Retirement Income
Security Act of 1974, as amended ("ERISA"), individual retirement accounts and
employee benefit plans subject to Section 4975 of the Code (hereinafter
referred to as "ERISA Plans" or "Plans"), may purchase Certificates issued by
the Trusts, subject to certain legal restrictions. Under ERISA, any person who
exercises any authority or control relating to management or disposition of the
assets of an ERISA Plan is considered to be a fiduciary of such Plan. ERISA
requires that fiduciaries of Plans cause the assets of such Plans to be
invested prudently, for the exclusive benefit of participants and in a manner
that does not result in a non-exempt "prohibited transaction" (as defined in
ERISA or the Code). A fiduciary of a Plan contemplating the purchase of a
Certificate should carefully consider how the purchase of a Certificate will
relate to the Plan's investment portfolio and whether a prohibited transaction
will result from such purchase. 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 the fiduciary responsibility and prohibited transaction
provisions of ERISA and Section 4975 of the Code. However, such plans
contemplating purchase of a Certificate should carefully consider how any state
laws or other Code provisions may relate to such purchase.
 
                                  UNDERWRITING
 
  Subject to the terms and conditions of the Underwriting Agreement with
United, the Underwriters named below have severally agreed to purchase from the
Trustees the Certificates of each Trust in the aggregate principal amount set
forth below opposite their respective names. The Underwriters are committed to
purchase all of the Certificates if any are purchased.
 
<TABLE>
<CAPTION>
                                                      PRINCIPAL     PRINCIPAL
                                                      AMOUNT OF     AMOUNT OF
                                                       1996-A1       1996-A2
                      UNDERWRITERS                  CERTIFICATES  CERTIFICATES
                      ------------                  ------------  ------------
      <S>                                           <C>           <C>
      Lehman Brothers Inc.......................... $             $
      Morgan Stanley & Co. Incorporated............
      NatWest Capital Markets Limited..............
                                                    ------------- -------------
          Total.................................... $             $
                                                    ============= =============
</TABLE>
 
  The Underwriters have advised United that they propose initially to offer the
Certificates to the public at the public offering prices per Certificate set
forth on the cover page of this Prospectus Supplement and to certain dealers at
such prices less a concession not in excess of the amounts for the respective
designations of Certificates set forth below. The Underwriters may allow, and
such dealers may reallow, a discount to certain other dealers not in excess of
the amounts for the respective designations of Certificates set forth below.
After the initial public offering, the public offering prices and such
concessions and discounts may be changed.
 
<TABLE>
<CAPTION>
                                                          CONCESSION
                                                          TO DEALERS REALLOWANCE
                                                          ---------- -----------
      <S>                                                 <C>        <C>
      1996-A1............................................        %           %
      1996-A2............................................
</TABLE>
 
  All secondary trading in the Certificates will settle in immediately
available funds. See "Description of the Certificates--Same-Day Settlement and
Payment" in the Prospectus.
 
                                      S-32
<PAGE>
 
  United has agreed to indemnify the Underwriters against certain civil
liabilities, including liabilities under the Securities Act of 1933, as
amended.
 
  United does not intend to apply for listing of the Certificates on a national
securities exchange, but has been advised by the Underwriters that they
presently intend to make a market in the Certificates, as permitted by
applicable laws and regulations. No Underwriter is obligated, however, to make
a market in the Certificates and any such market making may be discontinued at
any time at the sole discretion of such Underwriter. Accordingly, no assurance
can be given as to the liquidity of, or trading markets for, the Certificates.
 
  NatWest Capital Markets Limited ("NatWest"), a United Kingdom broker-dealer
and a member of the Securities Futures Authority Limited, has agreed that, as
part of the distribution of the Certificates offered hereby and subject to
certain exceptions, it will not offer or sell any Certificates within the
United States, its territories or possessions or to persons who are citizens
thereof or residents therein. The underwriting agreement between United and the
Underwriters does not limit the sale of the Certificates offered hereby outside
of the United States.
 
  NatWest has also represented and agreed that (i) it has not offered or sold
and will not offer or sell any Certificates to persons in the United Kingdom,
except to persons whose ordinary activities involve acquiring, holding,
managing or disposing of investments (as principal or agent) for the purposes
of their businesses or otherwise in circumstances which have not resulted and
will not result in an offer to the public in the United Kingdom within the
meaning of the Public Offers of Securities Regulations 1995, (ii) it has
complied with and will comply with all applicable provisions of the Financial
Services Act 1986 with respect to anything done by it in relation to the
Certificates in, from or otherwise involving the United Kingdom, and (iii) it
has only issued or passed on and will only issue or pass on in the United
Kingdom any document received by it in connection with the issue of the
Certificates to a person who is of a kind described in Article 11(3) of the
Financial Services Act 1986 (Investment Advertisements) (Exemption) Order 1995
or is a person to whom such document may otherwise lawfully be issued or passed
on.
 
  It is expected that delivery of the Certificates will be made against payment
therefor on or about the date specified in the last paragraph of the cover page
of this Prospectus Supplement, which will be the fifth business day following
the date of pricing of the Certificates. Under Rule 15c6-1 under the Exchange
Act, trades in the secondary market generally are required to settle in three
business days, unless the parties to any such trade expressly agree otherwise.
Accordingly, purchasers who wish to trade Certificates on the date of pricing
or the next succeeding business day will be required, by virtue of the fact
that the Certificates initially will settle in T+5, to specify an alternate
settlement cycle at the time of any such trade to prevent a failed settlement.
Purchasers of Certificates who wish to trade Certificates on the date of
pricing or the next succeeding business day should consult their own advisor.
 
                                      S-33
<PAGE>
 
                                                                        APPENDIX
 
                           GLOSSARY OF CERTAIN TERMS
 
  The following is a glossary of certain terms used in this Prospectus
Supplement. The definitions of terms used in this glossary that are also used
in the Basic Agreement, Trust Supplements, Indentures, Leases, Participation
Agreements, the Note Purchase Agreements or Trust Agreements are qualified in
their entirety by reference to the definitions of such terms contained therein.
 
  "Aircraft" means each of the 777 Aircraft and 747 Aircraft.
 
  "Aviation Act" means the provisions of Title 49 of the United States Code
relating to aviation, as amended, and the applicable regulations thereunder.
 
  "Basic Agreement" means the Pass Through Trust Agreement dated as of February
1, 1992, as amended and restated as of May 1, 1995, pursuant to which Pass
Through Trust Agreement, as supplemented by the Trust Supplements, the Trusts
will be formed.
 
  "Business Day" means any day other than a Saturday or a Sunday or a day on
which commercial banks are required or authorized to close in New York, New
York, Chicago, Illinois or the city and state in which the Trustee, an Owner
Trustee, an Owner Participant or the Loan Trustee maintains its principal place
of business or the city and state in which the Loan Trustee receives and/or
disburses funds.
 
  "Cede" means Cede & Co.
 
  "Certificate" means each of the Certificates of the two Trusts to be issued
by the related Trustee pursuant to the Basic Agreement and the applicable Trust
Supplement.
 
  "Certificate Account" means the one or more non-interest bearing accounts
established and maintained by the Trustee pursuant to the Basic Agreement on
behalf of the Certificateholders of the Trust created by the related Trust
Supplement for the deposit of payments representing Scheduled Payments on the
Equipment Notes held in such Trust.
 
  "Certificate Owner" means a person having a beneficial interest in a
Certificate.
 
  "Certificateholder" means the person in whose name a Certificate is
registered.
 
  "Code" means the United States Internal Revenue Code of 1986, as amended.
 
  "Commission" means the Securities and Exchange Commission.
 
  "DTC" means The Depository Trust Company.
 
  "Engine" means, with respect to the 777 Aircraft, each of the two Pratt &
Whitney model PW4077 engines relating to such aircraft, and, with respect to
the 747 Aircraft, each of the four Pratt & Whitney model PW4056 engines
relating to such aircraft, in each case as specified in the related Lease.
 
  "Equipment Notes" means the certificates issued on a nonrecourse basis by the
applicable Owner Trustee under the related Indenture.
 
  "Event of Default" means, with respect to the Basic Agreement, the occurrence
and continuance of an Indenture Default under one or more of the related
Indentures.
 
  "Event of Loss" means each of the events designated as such in a Lease. Upon
the occurrence of an Event of Loss with respect to an Aircraft, unless such
Aircraft is replaced, the related Lease will be terminated and the related
Equipment Notes will be redeemed. Upon the occurrence of an Event of Loss with
respect to
 
                                      A-1
<PAGE>
 
an Engine, such Engine will be replaced unless, with respect to an Engine
related to the 777 Aircraft and pursuant to the terms of such Lease, United
pays certain specified amounts and such Lease is terminated with respect to
such Engine and the related Equipment Notes are partially redeemed. For a
description of certain events constituting an Event of Loss, see "Description
of the Equipment Notes--The Leases--Events of Loss" in this Prospectus
Supplement.
 
  "Indenture" means each of the two separate Trust Indenture and Mortgages
entered into with respect to an Aircraft between an Owner Trustee and the Loan
Trustee and pursuant to which such Owner Trustee will issue the Equipment Notes
with respect to such Aircraft, as such Trust Indenture and Mortgage may from
time to time be amended or supplemented.
 
  "Indenture Default" means each of the events designated as an event of
default in an Indenture. For a description of certain events constituting
Indenture Defaults, see "Description of the Equipment Notes-- Indenture
Defaults, Notice and Waiver" in this Prospectus Supplement.
 
  "Lease" means each of the two separate Lease Agreements entered into with
respect to an Aircraft between an Owner Trustee and United, as each such Lease
Agreement may from time to time be amended or supplemented.
 
  "Lease Event of Default" means each of the events designated as an event of
default in a Lease. For a description of certain events constituting Lease
Events of Default, see "Description of the Equipment Notes--The Leases--Events
of Default" in this Prospectus Supplement.
 
  "Lien" means any mortgage, pledge, lien, charge, encumbrance, lease, exercise
of rights, security interest or claim.
 
  "Loan Trustee" means First Security Bank of Utah, National Association, a
national banking association, in its capacity as indenture trustee under each
Indenture, and any successor thereunder.
 
  "Note Purchase Agreement" means each of the two Redemption and Refinancing
Agreements entered into with respect to an Aircraft among United, a Loan
Trustee, the related Owner Participant, the related Owner Trustee and the
Trustee.
 
  "Owner Participant" means each of the owner participants for whose benefit an
Owner Trustee owns an Aircraft leased to United pursuant to a Lease, and its
permitted successors and assigns.
 
  "Owner Trustee" means State Street Bank and Trust Company of Connecticut,
National Association, a national banking association, not in its individual
capacity but solely as trustee of each of the two separate owner trusts for the
benefit of each of the Owner Participants, and its successors and assigns.
 
  "Participation Agreement" means each of the two separate Participation
Agreements entered into with respect to an Aircraft among United, an Owner
Participant, an Owner Trustee, the Loan Trustee and the Trustee, as such
Participation Agreement may from time to time be amended or supplemented.
 
  "Pool Balance" means, for each Trust, as of any date, the aggregate unpaid
principal amount of the Equipment Notes held in such Trust on such date plus
any amounts in respect of principal on such Equipment Notes held by the Trustee
and not yet distributed. 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 held in such
Trust and distribution thereof to be made on that date.
 
                                      A-2
<PAGE>
 
  "Pool Factor" means, for each Trust, as of any date, the quotient (rounded to
the seventh decimal place) computed by dividing (i) the Pool Balance by (ii)
the 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.
 
  "Record Date" means, with respect to a distribution of Scheduled Payments or
Special Payments, the 15th day (whether or not a Business Day) preceding the
applicable Regular Distribution Date or Special Distribution Date, as the case
may be.
 
  "Redemption Price" means, as to any Equipment Note on the applicable
redemption or purchase date therefor, the outstanding principal amount thereof
(or, in the case of an Event of Loss with respect to an Engine, the portion of
the outstanding principal amount thereof), together with accrued interest
thereon to such redemption or purchase date.
 
  "Regular Distribution Date" means January 30 and July 30 of each year,
commencing on or after July 30, 1996, until payment of all the Scheduled
Payments to be made under the Equipment Notes has been made.
 
  "Scheduled Payment" means each payment of interest or principal on an
Equipment Note scheduled to be received by the Trustee on January 30 or July 30
of each year, commencing July 30, 1996, until the final distribution date for
the relevant Trust.
 
  "747 Aircraft" means the Boeing 747-451 aircraft, together with the Engines
relating thereto, leased by an Owner Trustee to United pursuant to one of the
two separate Leases.
 
  "777 Aircraft" means the Boeing 777-222 aircraft, together with the Engines
relating thereto, leased by an Owner Trustee to United pursuant to one of the
two separate Leases.
 
  "Special Distribution Date" means any Business Day on which a Special Payment
will be distributed.
 
  "Special Payment" means (i) any payment of principal, premium, if any, and
interest resulting from the redemption of an Equipment Note held in a Trust,
(ii) any payment of principal of or interest (including any interest accruing
upon default) on or any other amount in respect of an Equipment Note upon an
Indenture Default in respect of, or upon acceleration relating to, an Equipment
Note held in a Trust, (iii) any payment of principal of, premium, if any, or
interest on an Equipment Note which is not in fact paid within five days of a
Regular Distribution Date or the applicable Special Distribution Date, or (iv)
any proceeds from the sale of any Equipment Note upon an Event of Default.
 
  "Special Payments Account" means the one or more accounts established and
maintained by the Trustee pursuant to the Basic Agreement on behalf of the
Certificateholders of the Trust created by the related Trust Supplement for the
deposit of payments representing Special Payments.
 
  "Trust" means each of the two separate United Airlines 1996-A Pass Through
Trusts, to be formed pursuant to the Basic Agreement and a related Trust
Supplement.
 
  "Trust Agreement" means each of the two separate Trust Agreements entered
into with respect to an Aircraft between an Owner Participant and an Owner
Trustee, as such Trust Agreement may from time to time be amended or
supplemented.
 
  "Trust Supplement" means each of the two separate Trust Supplements to the
Basic Agreement entered into between United and the Trustee pursuant to which
the two separate Trusts will be formed.
 
  "Trustee" means First Security Bank of Utah, National Association, a national
banking association, in its capacity as Trustee under the Basic Agreement, as
supplemented by each of the Trust Supplements, and each other person which may
from time to time act as successor Trustee under the Basic Agreement, as
supplemented by each of the Trust Supplements.
 
                                      A-3
<PAGE>
 
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 NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY IN-
FORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS SUP-
PLEMENT OR THE PROSPECTUS IN CONNECTION WITH THE OFFERING COVERED BY THIS PRO-
SPECTUS SUPPLEMENT OR THE PROSPECTUS. IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY UNITED OR
THE UNDERWRITERS. THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS DO NOT CONSTI-
TUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, THE CERTIFICATES
IN ANY JURISDICTION WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE
SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS SUPPLEMENT
OR THE PROSPECTUS NOR ANY SALE MADE HEREUNDER OR THEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS NOT BEEN ANY CHANGE IN THE
FACTS SET FORTH IN THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS OR IN THE AF-
FAIRS OF UNITED SINCE THE DATE HEREOF.
 
                               -----------------
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
                             Prospectus Supplement
 
<S>                                                                         <C>
Prospectus Supplement Summary..............................................  S-3
The Company................................................................  S-7
Recent Developments........................................................  S-7
Selected Financial and Operating Data......................................  S-9
Ratio of Earnings to Fixed Charges.........................................  S-9
Use of Proceeds............................................................ S-10
Diagram of Payments........................................................ S-11
Description of the Certificates............................................ S-12
Description of the Equipment Notes......................................... S-17
Federal Income Tax Consequences............................................ S-31
Certain Utah Taxes......................................................... S-31
ERISA Considerations....................................................... S-32
Underwriting............................................................... S-32
Glossary of Certain Terms..................................................  A-1
                                   Prospectus
Available Information......................................................    2
Incorporation of Certain Documents by Reference............................    2
United and UAL.............................................................    3
Formation of the Trusts....................................................    3
Use of Proceeds............................................................    3
Ratios of Earnings to Fixed Charges........................................    4
Description of the Certificates............................................    5
Description of the Equipment Notes.........................................   16
Federal Income Tax Consequences............................................   21
Certain State Taxes........................................................   22
ERISA Considerations.......................................................   23
Information to be provided by Prospectus Supplement........................   23
Plan of Distribution.......................................................   23
Legal Opinions.............................................................   24
Experts....................................................................   25
</TABLE>
 
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                                  $
 
                           [LOGO OF UNITED AIRLINES]
 
                           PASS THROUGH CERTIFICATES,
                                 SERIES 1996-A
 
                                ---------------
 
                             PROSPECTUS SUPPLEMENT
                                January   , 1996
 
                                ---------------
 
                                LEHMAN BROTHERS
 
                              MORGAN STANLEY & CO.
                                  INCORPORATED
 
                        NATWEST CAPITAL MARKETS LIMITED
 
 
 
 
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