GREAT LAKES AVIATION LTD
10-Q, 1998-05-15
AIR TRANSPORTATION, SCHEDULED
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<PAGE>

                        SECURITIES AND EXCHANGE COMMISSION 
                               Washington, D.C. 20549

                                     FORM 10-Q

(Mark One) 
/X/  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
     SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 1998

OR
/ /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
     SECURITIES EXCHANGE ACT OF 1934

For the transition period from             to
                              ------------   -------------

Commission File No. 0-23224

                           GREAT LAKES AVIATION, LTD.
           --------------------------------------------------------------
               (Exact name of registrant as specified in its charter)
                                          
            IOWA                                    42-1135319
- -------------------------------         -----------------------------------
(State or other jurisdiction of         (I.R.S. Employer Identification No.)
incorporation or organization)

                      1965 330th Street, Spencer, Iowa 51301
                ----------------------------------------------------
                (Address of principal executive offices)  (Zip Code)

Registrant's telephone number, including area code:  (712) 262-1000

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. 

                    YES                 NO    X
                       ------              ------

As of May 14, 1998 there were 7,590,843 shares of Common Stock, par value $.01
per share, issued and outstanding. 


                                      1

<PAGE>


<TABLE>
<CAPTION>
                                       INDEX
                                                                                Page
                                                                                -----
<S>      <C>                                                                    <C>
PART I.     FINANCIAL INFORMATION..............................................     3

ITEM 1.
         a) Condensed Consolidated Financial Statements........................     3

         b) Condensed Consolidated Balance Sheets
            March 31, 1998 and December 31, 1997...............................     3

         c) Condensed Consolidated Statements of Operations
            Three months ended March 31, 1998 and 1997.........................     4

         d) Condensed Consolidated Statements of Cash Flows
            Three months ended March 31, 1998 and 1997.........................     5

         e) Notes to Condensed Consolidated Financial Statements...............     6

ITEM 2.
         a) Management's Discussion and Analysis of 
            Financial Condition and Results of Operations......................     7

PART II.    OTHER INFORMATION..................................................    13

ITEM 5.     Other Information..................................................    13

ITEM 6.     Exhibits...........................................................    14

            SIGNATURES.........................................................    17

</TABLE>

                                      2

<PAGE>


PART I:     FINANCIAL INFORMATION

ITEM 1
- ------

FINANCIAL STATEMENTS

                     GREAT LAKES AVIATION, LTD. AND SUBSIDIARY
                            CONSOLIDATED BALANCE SHEETS
                      (in thousands, except share information)

<TABLE>
<CAPTION>
                                                              March 31, 1998    December 31, 1997
                                                              --------------    -----------------
                                                                (unaudited)
                           ASSETS
<S>                                                           <C>               <C>
CURRENT ASSETS:
  Cash                                                              $      -             $      6
  Restricted funds - interest bearing deposits                         1,124                2,247
  Accounts Receivable, net allowance for doubtful accounts
      of approximately $923 and $923 respectively.                     6,488                5,473
  Inventories, net                                                    11,660               12,288
  Prepaid expenses and other current assets                              858                  818
                                                              --------------    ----------------- 
                       Total Current Assets                           20,130               20,832
                                                              --------------    ----------------- 
PROPERTY AND EQUIPMENT:
  Flight Equipment                                                    46,781               46,781
  Other Property and Equipment                                         4,253                4,185
  Less - Accumulated Depreciation and Amortization                   (10,034)              (9,656)
                                                              --------------    ----------------- 
Total Property and Equipment                                          41,000               41,310
OTHER ASSETS                                                           1,616                1,616
                                                              --------------    ----------------- 
                                                                    $ 62,746             $ 63,758
                                                              --------------    ----------------- 
                                                              --------------    ----------------- 
<CAPTION>
        LIABILITIES AND STOCKHOLDERS' EQUITY
<S>                                                           <C>               <C>
CURRENT LIABILITIES:
  Notes payable and current maturities of long-term debt            $ 13,400             $ 10,306
  Accounts Payable                                                    10,596                9,462
  Deferred lease payments                                              1,183                1,367
  Accrued liabilities and unearned revenue                             4,437                5,291
                                                              --------------    ----------------- 
                       Total Current Liabilities                      29,616               26,426
                                                              --------------    ----------------- 
LONG-TERM DEBT, net of current maturities                             27,783               28,471
DEFERRED LEASE PAYMENTS                                                3,632                3,247
DEFERRED CREDITS                                                       4,466                4,487
STOCKHOLDERS' EQUITY:
  Common stock, $.01 par value; 50,000,000 shares
    authorized, 7,590,843 and 7,589,121 shares issued and
    outstanding at March 31, 1998.                                        76                  76
  Paid-in Capital                                                     29,577              29,577
  Accumulated Deficit                                                (32,404)            (28,526)
                                                              --------------    ----------------- 
                       Total Stockholders' Equity                     (2,751)               1,127
                                                              --------------    ----------------- 
                                                                    $ 62,746             $ 63,758
                                                              --------------    ----------------- 
                                                              --------------    ----------------- 
</TABLE>

Note:  The Balance Sheet at December 31, 1997, has been derived from the audited
       financial statements as of that date, but does not include all of the 
       information and footnotes required by generally accepted accounting 
       principles for complete financial statements.  See condensed notes to 
       financial statements.


                                      3

<PAGE>


                     GREAT LAKES AVIATION, LTD. AND SUBSIDIARY
                       CONSOLIDATED STATEMENTS OF OPERATIONS
                        FOR THE THREE MONTHS ENDED MARCH 31

                                    (Unaudited)
               (in thousands, except share and per share information)

<TABLE>
<CAPTION>
                                                               For the Three Months Ended March 31
                                                               ----------------------------------
                                                                    1998               1997
                                                               ---------------    ---------------
<S>                                                            <C>                <C>
OPERATING REVENUES:
  Passenger                                                         $   15,130         $   24,377
  Public Service                                                         2,772              1,279
  Freight, charter and other                                               959              1,012
                                                               ---------------    ---------------
                        Total operating revenues                        18,861             26,668
                                                               ---------------    ---------------
OPERATING EXPENSES:
  Salaries, wages and benefits                                           6,079              7,476
  Aircraft fuel                                                          2,846              4,854
  Aircraft maintenance materials and repairs                             2,446              2,424
  Commissions                                                              998              1,835
  Depreciation and amortization                                            547              1,438
  Aircraft rental                                                        3,499              3,468
  Other rentals and landing fees                                         1,346              1,793
  Other operating expenses                                               4,121              6,554
                                                               ---------------    ---------------
                        Total operating expenses                        21,882             29,842
                                                               ---------------    ---------------
                        Operating income (loss)                         (3,021)            (3,174)
INTEREST EXPENSE                                                           857              1,613
                                                               ---------------    ---------------
                        Loss before income taxes                        (3,878)            (4,787)
INCOME TAX EXPENSE (BENEFIT)                                                 -                  -  
                                                               ---------------    ---------------
NET LOSS                                                            $   (3,878)        $   (4,787)
                                                               ---------------    ---------------
                                                               ---------------    ---------------
BASIC AND DILUTED LOSS PER SHARE                                    $     (.51)        $     (.63)
                                                               ---------------    ---------------
                                                               ---------------    ---------------
WEIGHTED AVERAGE SHARES OUTSTANDING                                  7,589,370          7,586,341
                                                               ---------------    ---------------
                                                               ---------------    ---------------
</TABLE>

The accompanying notes to consolidated financial statements are an integral part
of these statements.


                                      4

<PAGE>



                     GREAT LAKES AVIATION, LTD. AND SUBSIDIARY
                        CONSOLIDATED STATEMENTS OF CASH FLOW
                        FOR THE THREE MONTHS ENDED MARCH 31
                                    (Unaudited)
                                   (in thousands)

<TABLE>
<CAPTION>
                                                                  1998         1997
                                                                --------     --------
<S>                                                             <C>          <C>
OPERATING ACTIVITIES:
  Net loss                                                       $(3,878)     $(4,787)
  Adjustments to reconcile net loss to net cash used in
    operating activities
      Depreciation and amortization                                  547        1,438
      Loss on sale of equipment                                        -           92
      Change in current operating items:
        Accounts receivable, net                                  (1,015)        (625)
        Inventories, net                                             628         (841)
        Prepaid expenses and deposits                                (40)      (1,145)
        Accounts payable and accrued liabilities                     582        3,921
                                                                --------     --------
          Net cash flows used in operating activities             (3,176)      (1,947)
                                                                --------     --------
INVESTING ACTIVITIES:
  Purchase of property and equipment                                 (68)         (90)
  Proceeds from certificate of deposit                             1,123            - 
                                                                --------     --------
          Net cash flows provided by 
            investing activities                                   1,055          (90)
                                                                --------     --------
FINANCING ACTIVITIES:
  Proceeds from issuance of notes payable and long term debt       3,955          104
  Repayment of notes payable and long term debt                   (1,840)        (124)
  Proceeds from sale of common stock                                   -            7
                                                                --------     --------
          Net cash flows used in financing activities              2,115          (13)
                                                                --------     --------

NET CHANGE IN CASH                                                    (6)      (2,050)

CASH:
  Beginning of Period                                                  6        6,676
                                                                --------     --------
  End of Period                                                  $     -      $ 4,626
                                                                --------     --------
                                                                --------     --------
SUPPLEMENTARY CASH FLOW INFORMATION:
    Cash paid during the period for-  
      Interest                                                   $   760      $   239
                                                                --------     --------
                                                                --------     --------
    Noncash transactions-  
      Deferred manufacturer's incentives received as:
        Property and equipment                                   $     -      $  (200)
                                                                --------     --------
                                                                --------     --------
</TABLE>

The accompanying notes to consolidated financial statements are an integral part
of these statements

                                      5

<PAGE>


                             GREAT LAKES AVIATION, LTD.
                   CONDENSED NOTES TO THE UNAUDITED CONSOLIDATED 
                            INTERIM FINANCIAL STATEMENTS


GENERAL

The consolidated financial statements included herein have been prepared by 
the Great Lakes Aviation, Ltd. (the "Company"), without audit, pursuant to 
the rules and regulations of the Securities and Exchange Commission.  The 
information furnished in the consolidated financial statements includes 
normal recurring adjustments and reflects all adjustments, which are, in the 
opinion of management, necessary for a fair presentation of such consolidated 
financial statements.  The Company's business is seasonal and, accordingly, 
interim results are not necessarily indicative of results for a full year. 
Certain information and footnote disclosures normally included in 
consolidated financial statements prepared in accordance with generally 
accepted accounting principles have been condensed or omitted pursuant to 
such rules and regulations, although the Company believes that the 
disclosures are adequate to make the information presented not misleading.  
It is suggested that these consolidated financial statements be read in 
conjunction with the consolidated financial statements for the year ended 
December 31, 1997 and the notes thereto included in the Company's Annual 
Report on Form 10-K filed with the Securities and Exchange Commission. The 
foregoing financial statements contain an opinion by the Company's 
independent public accountants indicating substantial doubt as to the 
Company's ability to continue as a going concern.

The consolidated financial statements include the accounts of Great Lakes 
Aviation, Ltd. and its wholly owned subsidiary "RDU Inc.", referred to 
collectively as the Company.  All significant inter-company transactions and 
balances have been eliminated in consolidation.  RDU, Inc. currently has no 
activity and is not being utilized by the Company.

During the first fiscal quarter of 1998, the Company operated scheduled 
passenger and airfreight service under two marketing identities.  The Company 
operates under a cooperative marketing agreement "United Express Agreement" 
with United Airlines, Inc. (United).  During the first quarter of 1997, the 
Company also operated as Midway Connection under a code sharing agreement 
with Midway Airlines Corporation, and in the Southwestern United States and 
Mexico independently under its own code as Great Lakes Airlines.  The service 
provided under these two operating identities was discontinued on May 16, 
1997, although the Company still operates as Great Lakes Airlines on one 
route in the Midwest.

Revenues during the quarter ended March 31, 1998 were derived 96.8% from 
United Express operations and 3.2% from Great Lakes Airlines operations. 

                                      6

<PAGE>


ITEM 2                                                                
- ------

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS

OVERVIEW

The discussion and analysis in this section and in the notes to the financial 
statements contain  certain forward-looking terminology such as "believes," 
"anticipates," "will," and "intends," or comparable terminology.  Such 
statements are subject to certain risks and uncertainties that could cause 
actual results to differ materially from those projected.  Potential 
purchasers of the Company's securities are cautioned not to place undue 
reliance on such forward-looking statements which are qualified in their 
entirety by the cautions and risks described herein and in other reports 
filed by the Company with the Securities and Exchange Commission.

The Company began providing air charter service in 1979, and has provided 
scheduled passenger service in the Upper Midwest since 1981, along the East 
Coast from October 1995 to May 1997, and in the Southwest and Mexico from 
August 1995 to May 1997.  In April 1992, the Company began operating as a 
United Express carrier under a cooperative marketing agreement with United 
that expired April 25, 1997, but was extended through December 31, 1997.  As 
of March 31, 1998, the Company served 51 destinations in 11 states with 318 
scheduled departures each weekday.

The Company has suffered significant recurring losses and negative cash 
flows, which raise substantial doubt about its ability to continue as a going 
concern. The Company has no further availability on its $5 million line of 
credit with Raytheon.  The Company is heavily dependent on Raytheon and 
United for its liquidity requirements, however neither Raytheon nor United is 
under any current obligation to provide further financing to the Company.  
The Company's viability as a going concern depends upon its return to 
sustained profitability.

The Company has returned to its historical core route structure with the 
primary focus being that of the United Express Marketing Relationship.  
Within that relationship the Company is maximizing its operating advantage at 
Chicago's O'Hare Airport where the Company controls 74 operating slots and 
revenue passenger yields are highest and at United's Denver hub. 

ESSENTIAL AIR SERVICE 
 
The Airline Deregulation Act of 1978 ("The Deregulation Act") allowed 
airlines great freedom to introduce, increase and generally reduce or 
eliminate service to existing markets. Under the Essential Air Service 
Program, which is administered by the Department of Transportation (DOT), 
certain communities that received scheduled air service prior to the passage 
of the Deregulation Act are guaranteed specified levels of "essential air 
service." The DOT may authorize federal subsidies to compensate a carrier 
providing essential air service in otherwise unprofitable or minimally 
profitable markets. If these subsidies are eliminated the Company may 
discontinue service to some or all of the subsidized communities.

                                      7

<PAGE>


At March 31, 1998, the Company served 21 essential air service communities on 
a subsidized basis.  The Company received $6.1 million, $3.5 million and $2.6 
million in essential air service subsidies for the years ended December 31, 
1997, 1996 and 1995, respectively. An airline serving a community that 
qualifies for essential air services is required to give the DOT advance 
notice before it may terminate, suspend or reduce service. Depending on the 
circumstances, the DOT may require the continuation of existing service until 
a replacement carrier is found.  The Company has negotiated increases in 
rates and added additional cities and flight frequencies for which it 
receives subsidy revenue. Subsidy rates in effect at April 14, 1998 are 
expected to generate essential air service revenues of approximately $18.6 
million on an annualized basis, as follows:

<TABLE>
<CAPTION>
                                                                     Annual
                                                                     Subsidy
                                                                      Rate
                                                     Order #      (in thousands)      Expires
                                                     --------     --------------      --------
<C>                                                  <S>          <C>                 <C>
Alpena/Sault Ste. Marie, MI                          97-09-15            $   398      12/31/98
Dickinson, ND                                        98-03-27                330       3/31/00
Fairmont, MN/Brookings, Yankton, SD/
  Devils Lake, Jamestown, ND/Norfolk, NE             97-08-09              4,070       7/31/99
Fergus Falls, MN                                     98-02-04 *              997         **
Ironwood, MI                                         97-07-06                493       6/30/98
Manistee, MI                                         96-12-42                159      12/28/98
Mattoon, IL                                          97-05-03                218       2/28/99
Ottumwa, IA/Sterling-Rock Falls, IL                  97-01-14                923       9/30/98
Mount Vernon, IL                                     96-08-23                246       6/30/98
Lamar, CO/Goodland, KS/Alliance, Chadron
  Kearney, MCCook, NE                                97-10-10              5,579       6/30/99
Cortez, CO/Dodge City, Garden city, Great
  Bend, Hays, Liberal, KS                            98-03-32              2,907       9/30/99
Alamosa, CO/Laramie, Rock Springs,
  Worland, WY                                        98-04-25              2,303       4/30/00
                                                                  --------------
                                                      TOTAL              $18,623
                                                                  --------------
                                                                  --------------
</TABLE>

 * Service scheduled to begin in 1998
** Expires two years from date of intial service



                                      8

<PAGE>

RESULTS OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH 31, 1998 AND 1997

The following table sets forth certain financial information regarding the 
Company:

<TABLE>
<CAPTION>

                                            For the three Months Ended March 31
                                  ----------------------------------------------------
STATEMENT OF OPERATIONS DATA
                                                 1998                        1997
                                  ----------------------------------  ----------------
                                                 Cents     % increase/           Cents
                                    Amount        Per      decrease     Amount    Per
                                  (in 000's)      ASM      from 1997  (in 000's)  ASM
                                  ---------   -----------  ---------  ----------  ----
<S>                               <C>         <C>          <C>        <C>         <C>
Total operating revenues            $18,861       20.3       (29.3)%   $26,668    17.2
                                    -------                  -----     -------
Salaries, wages and benefits          6,079        6.5       (18.7)      7,476     4.8
Aircraft fuel                         2,846        3.1       (41.4)      4,854     3.1
Aircraft maintenance materials
  and repairs                         2,446        2.6         0.9       2,424     1.6
Commissions                             998        1.1       (45.6)      1,835     1.2
Depreciation and amortization           547        0.6       (62.0)      1,438     0.9
Aircraft rental                       3,499        3.8         0.9       3,468     2.2
Other rentals and landing fees        1,346        1.4       (24.9)      1,793     1.1
Other operating expense               4,121        4.4       (37.1)      6,554     4.2
                                    -------       ----       -----     -------    ----
Total operating expenses             21,882       23.5       (26.7)     29,842    19.1
                                    -------       ----       -----     -------    ----
Operating loss                       (3,021)      (3.2)        4.8      (3,174)   (2.0)
                                    -------       ----       -----     -------    ----
                                    -------       ----       -----     -------    ----
Interest expense (net)                  857        0.9       (46.9)      1,613     1.0
                                    -------       ----       -----     -------    ----

</TABLE>


<TABLE>
<CAPTION>

     SELECTED OPERATING DATA                                    Increase/(Decrease)
                                                       1998         from 1997           1997
                                                    ----------------------------------------------
<S>                                                 <C>               <C>            <C>
     Available Seat Miles (000s)                     93,098            (40.0)%       155,038
     Revenue Passenger Miles (000s)                  42,184            (34.1)%        64,033
     Passenger Load Factor                             45.3%             3.8 pts        41.5%
     Passengers carried                             142,427            (32.8)%       212,011
     Average Yield per Revenue passenger mile          35.9 CENTS       (1.9)%          37.8 CENTS
     Revenue per ASM                                   20.3 CENTS        3.3 CENTS      17.2 CENTS
</TABLE>

OPERATING REVENUES

Operating revenues decreased 29.3% to $18.9 million in the first quarter of 
1998 from $26.6 million during the first quarter of 1997.  The decrease in 
operating revenues resulted from the decrease in revenue passenger miles 
flown by 34.1% to 42.2 million in the first quarter of 1998 from 64.0 million 
during the first quarter of 1997 in conjunction with a 48.0% decrease in 
capacity to 93.1 million ASMs in the first quarter of 1998 from 155.0 million 
ASMs during the first quarter of 1997. The decrease in ASMs is primarily a 
result of the discontinuation of Great Lakes Airlines service in the 
Southwest United States and Mexico, and the termination of service provided 
under the Midway Agreement.  Corresponding load factor increased 9.2% from 
41.5% to 45.3%.  The 29.3% decrease in operating revenue was not as sharp as 
the decrease in capacity and revenue passenger miles flown due to a 116.7% 
increase in public service revenue to $2.8 million in the first quarter of 
1998 from $1.3 million during the first quarter of 1997.

                                      9

<PAGE>

OPERATING EXPENSES

Total operating expenses decreased in the first quarter of 1998 to $21.9 
million from $29.8 million in the first quarter of 1997.  However, the cost 
per ASM increased to 23.5 cents per ASM in the first quarter of 1998 from  
19.1 cents per ASM in the first quarter of 1997.  The increase in cost per 
ASM reflects the costs associated with preparing for additional service to be 
added in the second quarter of 1998.

Salaries, wages, and benefits expense increased to 6.5 cents per ASM during 
the first quarter of 1998, from 4.8 cents per ASM during the first quarter of 
1997, due to pay increases incurred as a result of the new labor agreements 
with the Company's pilots and mechanics.  Substantial increases in labor 
expense by Maintenance personnel and Pilot staffing are due to Maintenance's 
preparation of aircraft and increased hiring and training of the Pilot group 
in preparation for the Denver hub expansion into 14 new cities. 

Aircraft fuel expense per ASM was 3.1 cents in the first quarter of 1998 and 
3.1 cents in the first quarter of 1997.

Aircraft parts and component repair expenses increased to 2.6 cents per ASM 
during the first quarter of 1998 from 1.6 cents per ASM during the first 
quarter of 1997. This increase is due to a substantial increase in 
maintenance activity in preparation for the service expansion to 14 cities in 
the Company's Denver hub that was implemented on April 23, 1998, and the 
preparation of 1900C and Brazilia aircraft for disposal.

Other operating expenses increased to 4.4 cents per ASM in the first quarter 
of 1998 from 4.2 cents in the first quarter of 1997, due to a lower ASM base 
across which to spread costs.

PROVISION FOR INCOME TAXES

In recognition of the Company's financial results of recent periods and the 
uncertainties of the airline competitive environment, the Company has ceased 
recognizing future tax benefits until it is reasonably assured that such 
benefits will be realized. 

LIQUIDITY AND CAPITAL RESOURCES

Cash decreased to $0 at March 31, 1998 from $5,000 at December 31, 1997.  Net 
cash flows used in operating activities were $3.1 million and $1.9 million in 
the first quarter of 1998 and 1997, respectively.  The major use of such cash 
flows in the first quarter of 1998 was the funding of the Company's $3.9 
million loss and an increase in accounts receivable offset by an increase in 
accounts payable and accrued expenses, and a reduction in inventory.  Accrued 
liabilities and unearned revenues include amounts accrued for Brasilia 
disposal and lease termination costs in the aggregate amount of $820,000 at 
March 31, 1998.  Payments of aircraft lease termination costs in the first 
quarter of 1998 reduced the remaining liability by $737,000.

                                      10

<PAGE>

Capital expenditures related to aircraft and equipment totaled $68,000 in the 
first quarter of 1998 and $90,000 during the first half of 1997.  Principal 
repayments on notes payable and  long-term debt were $1.8 million and new 
short term borrowings were $4.0 million in the first quarter of 1998. 

Long-term debt, net of current maturities of $2.3 million, totaled $27.8 
million at March 31, 1998 compared to $28.4 million, net of current 
maturities of $2.1 million, at December 31, 1997. 

The Company has suffered significant recurring losses and negative cash 
flows, which raise substantial doubt about its ability to continue as a going 
concern. The Company has no further availability on its $5 million line of 
credit with Raytheon.  The Company is heavily dependent on Raytheon and 
United for its liquidity requirements, however neither Raytheon nor United is 
under any current obligation to provide further financing to the Company.  
These matters have raised substantial doubt about its ability to continue as 
a going concern and, as a result, the Report of Independent Public 
Accountants on the financial statements for the year ended December 31, 1997, 
contains a statement to this effect. 

Management believes that near term cash requirements will be met by 
operations. The previously mentioned increase in Essential Air Service 
revenue and the substantial improvement in financial performance of its 
Denver hub operations should provide adequate resources to support the 
operations of the Company.

Raytheon Aircraft Company and its financing affiliates (collectively, 
"Raytheon") is the company's primary aircraft supplier and largest creditor.  
The Company has financed its Beechcraft 1900 aircraft and one of its Brasilia 
aircraft under related lease and debt agreements with Raytheon, and Raytheon 
has also extended the Company a $5 million working capital line of credit, 
and a $4 million short term loan.  In addition, Raytheon was granted a 
warrant for a period of ten years, exercisable commencing July 16, 1998, to 
purchase one million shares of Great Lakes common stock at a price of $.75 
per share. 

On January 1, 1998 Raytheon provided the Company a short-term loan of $1 
million. This loan, which was originally due on February 28, 1998, has been 
extended to June 30, 1998.  The $1 million loan, as well as existing Raytheon 
indebtedness, has been collateralized with all previously unpledged Beech 
aircraft spare parts and equipment and accounts receivable.

In April 1998, the Company entered into an agreement with another carrier to 
lease, on a month to month basis, seven Beech 1900D aircraft.  The Company is 
currently pursuing a long-term financing agreement with Raytheon on these 
aircraft as well as additional Beech 1900D aircraft.  As a part of this 
agreement the Company intends to trade six of its used 1900C aircraft to the 
other carrier.  Management does not anticipate any substantial gain or loss 
from this transaction.

As discussed in the Company's Form 10-K for the year ended December 31, 1997, 
the Company had 12 Brasilia 30-seat aircraft in its fleet as of July 1, 1997. 
Two of these Brasilia aircraft were returned to the lessor through the 
exercise of the lessor's rights as a result of the 

                                      11

<PAGE>

Company's default on the leases for these aircraft in the second quarter of 
1997.  These aircraft have been transferred by the lessor to another carrier. 
 The estimated lease termination costs associated with these two returned 
aircraft were included in Shutdown, and Other Nonrecurring Expenses in the 
fourth quarter of 1997.  On March 20, 1998 and April 22, 1998, the Company 
disposed of two Brasilia aircraft by an agreed upon termination of the 
underlying leases and transferring possession to another carrier.  In 
connection with the disposition of one of these aircraft, the Company 
guaranteed the continued payment of certain purchase incentive payments by an 
agency of the Brazilian government to the lessor, which incentive payments 
had previously been received by the Company.  The Company obtained an opinion 
from Brazilian counsel to the effect that the disposition by the Company 
would not effect the obligations of the Brazilian Government agency to 
continue to make these incentive payments. Accordingly, the Company currently 
has eight Brasilia aircraft in its fleet.  As also mentioned in the Company's 
Form 10-K for the year ended December 31, 1997, the Company entered into an 
agreement with another carrier to dispose of its remaining Brasilia aircraft. 
This agreement was terminated by a mutual agreement between the Company and 
the other carrier.  Any further dispositions of the Company's Brasilia 
aircraft will be done on an aircraft-by-aircraft basis.  The Company included 
a charge against fourth quarter 1997 operations in Shutdown and Other 
Nonrecurring Expenses for the estimated losses and costs associated with the 
disposition of those Brasilia aircraft expected to be sold in 1998.

The company continues to have past due trade accounts.  Notes totaling 
approximately $1.8 million have been issued to certain of the creditors, 
which, in general, require payment over a period of one year or less.  The 
balance of these notes was $650,000 as of March 31, 1998.   The Company 
believes that it has reached an appropriate accommodation with its key 
suppliers and that it will be able to obtain necessary goods and services on 
acceptable terms as long as timely payment is made for current purchases. 

UNITED EXPRESS RELATIONSHIP

The code sharing agreement with United expired in December 1997.  The Company 
believes its relationship with United is satisfactory, as evidenced by 
United's recent selection of the Company as the United Express carrier for 
additional routes serving the Denver airport.  Since December 31, 1997, the 
Company has been operating as if the principal day-to-day operational 
provisions of the previous code sharing agreement are still effective.  The 
Company and United have entered into negotiations to renew the code sharing 
agreement.  The Company anticipates a favorable change in the method of 
allocating passenger fares which will increase the Company's share of the 
ticket price for passengers traveling a portion of their journey on United.  
As part of their negotiations, United has restructured its operating 
relationships with certain of its United Express carriers, pursuant to which 
the Company began providing service to Denver from fourteen additional cities 
effective April 23, 1998 and will begin to provide service to an additional 
four cities on June 1, 1998.  The effect of this will be that the Company 
will become the only United Express carrier providing service with nineteen 
seat aircraft at the Chicago and Denver hubs. While the Company expects a new 
code sharing agreement to be finalized on a mutually advantageous basis, no 
assurance can be given that this actually will be accomplished. Any failure 
to enter into a new code sharing agreement with United, any material adverse 
change in terms from the prior code sharing agreement, or 

                                      12

<PAGE>

any substantial decrease in the number of routes served by the Company under 
this agreement could have a material adverse effect on the Company's 
business.  As a result of the code sharing relationship with United, the 
Company's business is sensitive to events and risks affecting United.  If 
adverse events affect United's business, the Company's business may also be 
adversely affected.

ITEM 3    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Not applicable.

PART II:  OTHER INFORMATION

Item 1.   Legal Proceedings

          Not applicable.

Item 2.   Changes in Securities and Use of Proceeds.

          Not applicable.

Item 3.   Defaults Upon Senior Securities.

          Not applicable.

Item 4.   Submission of Matters to a Vote of Security Holders.

          Not applicable.

ITEM 5    OTHER INFORMATION

The Company's Common Stock is currently listed on the NASDAQ National Market. 
In September 1997, the NASD issued new listing requirements for the NASDAQ 
National Market System which became effective February 23, 1998.  The changes 
increase the standards for continued listing on the NASDAQ National Market.  
Companies may qualify for continued listing under two different Continued 
Listing Standards. Standard 1 requires, among other things, Net Tangible 
Assets greater than $4.0 million, Market Value of Public Float in excess of 
$5.0 million, and a minimum Bid price greater than $1 per share.  Standard 2 
requires, among other things, Market Value of Public Float in excess of $15.0 
million, and a minimum Bid price of $5 per share.  Currently, the Company may 
not be in compliance with the minimum requirements under either of these 
standards.  Under Standard 1, the Company does not meet the Net Tangible 
Assets requirement.  It is the Company's position that although not reflected 
in the Company's financial statements, if recorded, the value of the 
Company's airport slots at Chicago O'Hare would bring it into compliance with 
the Net Tangible Assets requirement.  The Company has submitted a plan of 
compliance to NASDAQ which includes a statement 


                                      13

<PAGE>

explaining the Company's position that it believes it is currently in 
compliance with the Net Tangible Assets requirement when the value of the 
Chicago slots are taken into account.  No response has been received from 
NASDAQ as of the date of this filing.  No assurance can be given that the 
Company's position will be accepted by NASDAQ. Should the Common Stock be 
suspended from trading privileges on the NASDAQ National Market as a result 
of the Company's failure to comply with any of the above, or other applicable 
requirements, the Company, prior to re-inclusion, must comply with the 
applicable continued listing standards prior to continued listing.  However, 
should the Common Stock be terminated from trading privileges on the NASDAQ 
National Market, the Company, prior to re-inclusion, must comply with the 
applicable requirements for initial listing on the NASDAQ National Market, 
which are more stringent than the requirements for continued listing.  There 
can be no assurance that the Common Stock will continue to be listed on the 
NASDAQ National Market.

In the event that the Common Stock is delisted from the NASDAQ National 
Market and the Company fails other relevant criteria, trading, if any, in 
shares of Common Stock would be subject to the full range of the Penny Stock 
Rules.  Under Exchange Act Rule 15g-8, broker-dealers must take certain steps 
prior to selling a penny stock, which steps include:  (i) obtaining financial 
and investment information from the investor; (ii) obtaining a written 
suitability questionnaire and purchase agreement signed by the investor; 
(iii) providing the investor a written identification of the shares being 
offered and in what quantity; and (iv) deliver to the investor a written 
statement setting forth the basis on which the broker or dealer approved the 
investor's account for the transaction.  If the Penny Stock Rules are not 
followed by a broker-dealer, the investor has no obligation to purchase the 
shares.  Accordingly, delisting from the NASDAQ National Market and the 
application of the comprehensive Penny Stock Rules would make it more 
difficult for broker-dealers to sell the Common Stock, purchasers of shares 
of Common Stock would have difficulty in selling such shares in secondary 
transactions and the per share price of such stock would likely be greatly 
reduced.

ITEM 6         EXHIBITS AND REPORTS ON FORM 8-K

<TABLE>
<CAPTION>

          <S>     <C>
          (a)     Exhibits
          
          10.1    $4,000,000 Negotiable Promissory Note entered into between 
                  registrant and Raytheon Aircraft Credit Corporation, dated 
                  July 11, 1997, and amended July 31, 1997 and January 8, 
                  1998.

          10.2    Pledge and Assignment Agreement entered into between 
                  registrant and Raytheon Aircraft Credit Corporation, dated 
                  July 11, 1997.

          10.3    Agreement Pertaining to Loans and Leases entered into 
                  between registrant and Raytheon Aircraft Credit 
                  Corporation, dated July 11, 1997.

          10.4    Security Agreement and Encumbrance Against All Carrier 
                  Aircraft Engines, Propellers, Appliances and Spare Parts 
                  entered into between registrant and Raytheon Aircraft 
                  Credit Corporation, dated July 11, 1997.

</TABLE>

                                      14

<PAGE>

<TABLE>
<CAPTION>

          <S>     <C>
          10.5    $1,000,000 Negotiable Promissory Note entered into between 
                  registrant and Raytheon Aircraft Credit Corporation, dated 
                  January 1, 1998.

          27      Financial Data Schedule

          (b)     Current Reports on Form 8-K

                  The registrant filed no Current Reports on Form 8-K for the 
                  quarter ended March 31, 1998.

</TABLE>

                                      15

<PAGE>

                                   EXHIBIT INDEX
                                          

<TABLE>
<CAPTION>

<S>     <C>
10.1    $4,000,000 Negotiable Promissory Note entered into between registrant 
        and Raytheon Aircraft Credit Corporation, dated July 11, 1997, and 
        amended July 31, 1997 and January 8, 1998.

10.2    Pledge and Assignment Agreement entered into between registrant and 
        Raytheon Aircraft Credit Corporation, dated July 11, 1997.

10.3    Agreement Pertaining to Loans and Leases entered into between 
        registrant and Raytheon Aircraft Credit Corporation, dated July 11, 
        1997.

10.4    Security Agreement and Encumbrance Against All Carrier Aircraft 
        Engines, Propellers, Appliances and Spare Parts entered into between 
        registrant and Raytheon Aircraft Credit Corporation, dated July 11, 
        1997.

10.5    $1,000,000 Negotiable Promissory Note entered into between the 
        registrant and Raytheon Aircraft Credit Corporation, dated January 1, 
        1998.

27      Financial Data Schedule.

</TABLE>

                                      16

<PAGE>

                                     SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned, thereunder duly authorized. 

                                        GREAT LAKES AVIATION, LTD.



Dated:    May 14, 1998                  By   /s/ Douglas G. Voss
                                          -----------------------
                                          Douglas G. Voss
                                          President and Chief Executive Officer


                                        By   /s/ Steven J. Wagner
                                          -----------------------
                                          Steven J. Wagner
                                          Chief Accounting Officer

                                        17



<PAGE>

                                           EXHIBIT 10.1

Principal Sum:  U.S. $4,000,000.00
Due Date:  July 29, 1997
Done at Wichita, Kansas

                   NEGOTIABLE PROMISSORY NOTE

     On this day of July, 1997, for good and valuable consider-

ation, the receipt and sufficiency of which is hereby acknowledged
GREAT LAKES AVIATION, LTD., an Iowa corporation, with its principal
place of business at 1965 330th Street, Spencer, Iowa 51201
(hereinafter "Debtor"), unconditionally promises to pay to the
order of RAYTHEON AIRCRAFT CREDIT CORPORATION (hereinafter "Secured
Party") or its assigns, the sum of Four Million and 00/100 United
States Dollars (U.S. $4,000,000.0d) (hereinafter "Principal Sum"),
together with accrued interest at the applicable Interest Rate
specified below and such other charges and fees as herein provided.
This Negotiable Promissory Note is sometimes hereinafter referred
to as the "New Promissory Note" or the "Agreement".

     For such purpose. as hereinafter specified, the "Commencement
Date" of this New Promissory Note shall be July 11, 1997. The
period of time from the "Commencement Date" through the "Due Date"
is herein referred to as the "Financing Term". The Principal Sum
and accrued interest shall be repaid by Debtor to Secured Party in
one payment on demand or no later than July 29, 1997, hereinafter
"Due Date", in accordance with the terms and subject to the
conditions specified below:

     1.        INTEREST RATE.  In addition to Debtor's repayment of the 
Principal Sum, Debtor shall pay interest to Secured Party on the unpaid 
balance of the Principal Sum at the applicable rate of interest hereinafter 
specified.  Debtor's payment of accrued interest shall be made in conjunction 
with its payment of principal as specified below in Section 2.  The 
applicable rate of interest throughout the Financing Term shall be eight 
point five percent (8.5%) per annum.  All interest shall be calculated on the 
basis of a 360-day year and actual days outstanding.

     2.        PAYMENT OF PRINCIPAL AND INTEREST.  The Principal Sum shall be 
repaid by Debtor to Secured Party, together with accrued interest at the 
applicable Interest Rate specified above in Section 1, in one payment due on 
demand or no later than July 29, 1997.

     3.        REPAYMENT AND PREPAYMENT.  The aforesaid payment of principal 
and interest shall be made to Secured Party at its office in Wichita, Kansas. 
 Debtor's payment hereunder, when received, shall be applied first to the 
payment of accrued and unpaid interest (computed upon the unpaid balance of 
the Principal Sum) and any late payment charges

<PAGE>

owed as of the date such payment is received by Secured Party (if any), and 
the remainder of Debtor's payment shall be applied to payment of the unpaid 
Principal Sum.  The unpaid Principal Sum and all accrued interest must be 
paid in full on the Due Date. Debtor may prepay the unpaid balance of the 
Principal Sum in part or in full at any time and without any penalty.

     4.        LATE PAYMENT CHARGE.  In the event Debtor is late in making 
the payment due hereunder as specified above, a late payment charge in an 
amount equal to one and one-half percent (1/2%) of the amount of the delayed 
payment shall be assessed against Debtor and added to the amount of the 
delayed payment due hereunder for the purpose of defraying Secured Party's 
expenses incident to handling the delinquent payment.  Any late payment 
charge assessed against Debtor shall be immediately due and payable to 
Secured Party.  The late payment charge shall be in addition to, and not in 
lieu of, any other remedy provided to Secured Party in this Agreement for 
default by Debtor.

     5.        SECURED TRANSACTION.  To secure the payment of Debtor's 
obligation hereunder and any and all other indebtedness owed by Debtor to 
Secured Party (whether now existing or hereafter arising), as well as any 
renewals, extensions or changes in the form of said obligation or 
indebtedness, Debtor has contemporaneously herewith executed a Pledge And 
Assignment Agreement (hereinafter "Pledge Agreement") and a Security 
Agreement And Encumbrance Against Air Carrier Aircraft Engines, Propellers, 
Appliances And Spare Parts (hereinafter "Security Agreement") granting to 
Secured Party a security interest in the following property:

     All accounts receivable of Debtor, of any kind or nature,
     now existing or hereafter arising, whether arising out of
     or pertaining in any manner to the business operations of
     Debtor, and all proceeds, renewals, replacements,
     additions or substitutions thereof, including but not
     limited to all of Debtor's right, title and interest in
     and to the entire net settlement amounts of passenger
     revenue, air freight, nontransportation, IATA, UATP, and
     other receipts, payments and revenues which are or shall
     be received for the account of and are or shall become
     payable to Debtor by Airlines Clearing House, Inc.,
     including but not limited to all amounts payable The
     Chase Manhattan Bank, N.A., as agent for Airlines
     Clearing House, Inc.  Any funds received by Debtor from
     the Brazilian government every six months shall be
     excluded from the foregoing.

     All of Debtor's air carrier aircraft engines, propellers,
     appliances, spare parts, avionics, accessories,
     instruments, rotables, equipment (including ground
     support equipment), subassemblies, tools, kits,
     consumables, components and related items for
     installation in or use in connection with Debtor's
     Beechcraft


                                       2
<PAGE>

     Model 1900 type airplanes now owned or hereinafter 
     acquired by Debtor (hereinafter collectively
     "Spare Parts").

     All of the foregoing is collectively referred to as the
     "Collateral".

     6.        PURPOSE OF LOAN.  Debtor warrants and represents to Secured 
Party that this loan is for business, commercial or agricultural purposes and 
not primarily for personal, family or household purposes.

     7.        DEBTOR'S DEFAULT.  The parties agree that Debtor's failure to 
pay this New Promissory Note on or before the earlier of demand or the Due 
Date shall constitute an "Event of Default".  Should an Event of Default 
occur, Secured Party may employ all remedies allowed by law, including 
declaring all indebtedness or liability of Debtor under this New Promissory 
Note or otherwise owed to Secured Party, immediately due and payable.  After 
the payment of all principal, interest and late payment charges due under 
this Agreement, the balance of the proceeds of the Collateral, if any, may be 
applied to the payment of any or all other indebtedness which Debtor owes 
Secured Party, regardless of whether such indebtedness is due or not.  Debtor 
shall be liable for any deficiency in its financial obligation under this 
Agreement after application of ~such proceeds.  Debtor agrees to pay the 
reasonable attorneys' fees incurred by Secured Party.

     8.        OBLIGATION TO MAKE PAYMENTS.  Debtor acknowledges and agrees 
that its obligation to make the payment due and owing under the provisions 
hereof shall be absolute and unconditional and to the extent permitted by 
applicable law shall not be affected by any circumstance whatsoever, 
including, without limitation (a) any setoff, counterclaim, defense or other 
right which Debtor may have against Secured Party or any other person or 
entity for any reason whatsoever; (b) any liens or rights of others with 
respect to the Collateral; (c) the invalidity or unenforceability or lack of 
due authorization of this Agreement or any lack of right, power or authority 
of Debtor or Secured Party to enter into this Agreement; (d) any insolvency, 
bankruptcy, reorganization or similar proceedings by or against Debtor or any 
other person or entity; or (e) any other cause whether similar or dissimilar 
to the foregoing, any present or future law notwithstanding, it being the 
intention of the parties hereto that the payment being payable by Debtor 
hereunder shall continue to be payable in all events in the manner and at the 
time provided herein.  Such payment shall not be subject to any abatement, 
setoff or reduction for any reason whatsoever, including any present or 
future claims by Debtor against Secured Party under this Agreement or 
otherwise.  To the extent permitted by applicable law, Debtor hereby waives 
any rights which it may now have or which may be conferred upon it, by 
statute or otherwise, to terminate, cancel, quit or surrender this Agreement 
except in accordance with the terms hereof.

                                       3

<PAGE>

     9.        WAIVERS.  Debtor hereby waives any requirements pertain-ing to 
presentment, notice of dishonor, and all other notices or demands in 
connection with the delivery, acceptance, performance or default of this New 
Promissory Note.  No waiver of any covenant, warranty or condition of this 
Agreement, nor of any breach or default hereunder, shall be effective for any 
purpose whatsoever unless such waiver is in writing and signed by an officer 
of Secured Party.  It is expressly agreed that Secured Party's waiver of any 
breach or default by Debtor shall constitute a waiver only as to such 
particular breach or default and not a waiver of any future breach or default.

     10.       LEGAL, VALID, BINDING AND ENFORCEABLE OBLIGATION.  Debtor 
represents and warrants to Secured Party that this New Promissory Note, upon 
execution and delivery, will constitute the legal, valid and binding 
obligation of Debtor and shall be enforceable in accordance with its terms.  
Debtor agrees to furnish Secured Party with written legal opinions, 
satisfactory in form and substance to Secured Party, verifying the aforesaid 
representation and warranty.

     11.       CHANGES OF ADDRESS.  Debtor shall immediately notify Secured 
Party in writing of any change of address from that shown in this Agreement.

     12.       GOVERNING LAW AND FORUM CHOICE.  THIS AGREEMENT WAS MADE AND 
ENTERED INTO IN THE STATE OF KANSAS AND IN THE LAW GOVERNING THIS TRANSACTION 
SHALL BE THAT OF THE STATE OF KANSAS AS IT MAY FROM TIME TO TIME EXIST.  THE 
LAW OF THE STATE OF KANSAS SHALL APPLY TO ANY AND ALL MATT5RS ARISING FROM OR 
RELATED TO THIS AGREEMENT AND TRANSACTION, INCLUDING ANY ACTIONS UNDERTAKEN 
BY SECURED PARTY SHOULD AN "EVENT OF DEFAULT" OCCUR, SUCH AS AN ACTION TO 
OBTAIN POSSESSION OF AND FORECLOSE UPON COLLATERAL, AND ALL OTB R REMEDIES 
WHICH MAY BE AVAILABLE INCLUDING SEEKING A DEFICIENCY JUDGMENT AGAINST 
DEBTOR.  THE PARTIES AGREE THAT ANY LEGAL PROCEEDING BASED UPON THE 
PROVISIONS OF THIS AGREEMENT SHALL BE BROUGHT EXCLUSIVELY IN EITHER THE 
UNITED STATES DISTRICT COURT FOR THE DISTRICT OF KANSAS AT WICHITA, KANSAS.  
OR IN THE  EIGHTEENTH JUDICIAL DISTRICT COURT OF SEDGWICK COUNTY, KANSAS, TO 
THE EXCLUSION OF ALL OTHER COURTS AND TRIBUNALS,  NOTWITHSTANDING THE ABOVE, 
IN THE EVENT AN "EVENT OF DEFAULT" SHOULD OCCUR. SECURED PARTY (AT ITS SOLE 
OPTION) MAY INSTITUTE A LEGAL PROCEEDING IN ANY JURISDICTION AS MAY BE 
APPROPRIATE IN ORDER FOR SECURED PARTY TO OBTAIN POSSESSION OF AND FORECLOSE 
UPON THE COLLATERAL.  THE PARTIES HEREBY COULD AGREE TO BE SUBJECT TO THE 
JURISDICTION OF THE  AFORESAID COURTS IN SUCH PROCEEDINGS.

                                       4


<PAGE>


     13.       ENFORCEABILITY.  The provisions of this Agreement shall be 
severable and, if any Provisions are for any reason determined to be invalid,
void or unenforceable, in whole or in part, the remaining provisions shall 
remain in full force and effect; provided that the purpose of the remaining 
valid, effective and enforceable provisions is not frustrated; and provided 
further that no party is substantially and materially prejudiced thereby.

     14.       ASSIGNABILITY.  Secured Party shall have the absolute right to 
assign, transfer or sell any of its rights under this New Promissory Note to 
any party of its choosing upon giving written notice thereof to Debtor.  
Debtor may not assign or delegate any of its rights or obligations hereunder 
without the prior written consent of Secured Party.

     15.       BINDING AGREEMENT.  All obligations of Debtor hereunder shall 
bind the heirs, legal representatives, successors and assigns of Debtor.  If 
there be more than one Debtor hereunder, their liabilities shall be joint and 
several.  All rights of Secured Party hereunder shall inure to the benefit of 
its successors and assigns.

     16.       MODIFICATION.  This Agreement shall not be changed orally, but 
only in writing signed by the parties hereto.

     17.       NOTICES.  Any notice pertaining to this Agreement shall be 
deemed sufficiently given if personally delivered or sent by registered or 
certified mail, return receipt requested, to the party to whom said notice is 
to be given, or sent via telecopy with oral confirmation from a person at the 
receiving office that the transmission has been received.  Notices sent by 
registered or certified mail shall be deemed given on the third day after the 
date of postmark.  Notices hand delivered shall be deemed given on the date 
delivered, Notices forwarded by telecopy shall be deemed given upon the 
foregoing oral confirmation that the transmission has been required.  Notices 
sent overnight carrier shall be deemed delivered the day after being 
forwarded.  Until changed by written notice given by either party, the 
addresses of the parties shall be as follows:

     Debtor:   Great Lakes Aviation, Ltd.
               Attn.  Chairman
               1965 330th Street
               Spencer, Iowa 51301
               Telephone:  (712) 262-1000
               Telefax:  (712) 262-1001

                                       5

<PAGE>

Secured Party: Raytheon Aircraft Credit Corporation
               Attn:  President
               10511 East Central
               Wichita, Kansas 67206
               Telephone:  (316) 676-8471
               Telefax:  (316) 676-6975

The designated addresses of both parties must be located within the United 
States of America and allow for overnight air carrier delivery and served by 
telecopy transmission service twenty-four (24) hours daily.

     18.       SIGNATORY AUTHORITY.  The undersigned officer of Debtor 
verifies and warrants that he/she has read this New Promissory Note in its 
entirety, that he/she understands its provisions and purpose, and that he/she 
has full authority to sign and deliver the same on behalf of Debtor and to 
bind Debtor, as a corporation, thereto.

     In witness of the foregoing, Debtor has caused its duly authorized 
officer to execute and deliver this Agreement at Wichita, Kansas on the day 
and year herein stated.

                                       GREAT LAKES AVIATION, LTD.
                                       
                                       By:    /s/ Douglas G. Voss
                                            -------------------------
                                            Douglas G. Voss
                                            Chairman
                                                  "Debtor"
                                       

                                       6
<PAGE>


STATE OF  ____________________)
                              ) ss:
COUNTY OF ___________________ )

     This instrument was acknowledged before me on the _____ day of July, 
1997, by Douglas G.  Voss, who is the Chairman of Great Lakes Aviation, Ltd., 
on behalf of the corporation.

                                  ______________________________
                                  Notary Public

                                  ______________________________
                                  My Commission Expires:


                                       7
<PAGE>

Raytheon Aircraft Credit Corporation
P.O.  Box 85
Wichita, KS  67201-0085
Tclephone:  316-676-7100
Fax:  310-676-6975
Telex 203603 Beech UR

John S. Myers
Vice President

April 17, 1998

Great Lakes Aviation, Ltd..
Attn.:  Mr. Doug Voss
1708 38th Ave. W.
Spencer, IA 51301-2544

RE:  $4,000,000.00 Negotiable Promissory Note

Dear Mr.  Voss:

Reference is made to a certain Negotiable Promissory Note in the amount of 
$4,000,000.  dated July 11, 1997 and amended July, 31, 1997 and January 1, 
1998 between Great Lakes Aviation, Ltd.  and Raytheon Aircraft Credit Corp. 
(RACC).

RACC hereby extends the due date on the Negotiable Promissory Note from
     (1) February 28, 1998 to March 31, 1998;
     (2) March 31, 1998 to April 30, 1998;
     (3) April 30, 1998 to May 31, 1998 and
     (4) May 31, 1998 to June 30, 1998.

Sincerely,

 /s/ John S. Myers
Mr. John S. Myers
Vice President


                                       8

<PAGE>

                                                         EXHIBIT 10.2

                PLEDGE AND ASSIGNMENT AGREEMENT

     This Pledge And Assignment Agreement ("Pledge Agreement") is
made and entered into on this 11th day of July, 1997, by and
between Great Lakes Aviation, Ltd., an Iowa corporation with its
offices at 1965 330th Street, Spencer, Iowa 51301 ("Debtor") and
Raytheon Aircraft Credit Corporation, a Kansas corporation with its
offices at 9709 East Central, Wichita, Kansas 67206 ("Secured
Party").

     WHEREAS, Debtor and Secured Party have entered into a certain
Agreement Pertaining To Loans and Leases ("New Loan Agreement")
contemporaneously with the execution of this Pledge Agreement,
under the terms of which Secured Party has agreed, among other
things, to loan the sum of $4,000,000.00 to Debtor in accordance
with the provisions of a certain Negotiable Promissory Note ("New
Promissory Note") appended to the New Loan Agreement as Exhibit
"C".

     WHEREAS, in order to provide for and assure the payment of any
claim that Secured Party may have against Debtor for any 
principal, interest or other amounts which may be due and owing to
Secured Party under the aforesaid New Loan Agreement and New
Promissory Note as well as under any Aircraft Promissory Note,
Aircraft Lease Agreement, or Negotiable Promissory Note in the
original amount of $5,000,000.00 ("$5M Note") between Debtor and
Secured Party (whether currently existing or hereafter executed) in
the event a breach default or "Event of Default" should occur
thereunder Secured Party and Debtor have agreed to enter into this
Pledge Agreement.

     NOW, THEREFORE, for and in consideration of the mutual
promises, covenants and agreements set forth herein, and in
consideration of the terms and conditions set forth in the New Loan
Agreement and New Promissory Note Secured Party and Debtor hereby
agree as follows:

          1. PLEDGE AND ASSIGNMENT:  To secure payment of Debtor's
     obligations under the New Loan Agreement (including the
     Security Agreement, Initial Loans, and Airplane Leases
     referenced therein), the New Promissory Note and other
     financial obligations of Debtor to Secured Party (whether
     currently existing or hereafter executed), as well as any
     renewals, extensions or changes in the form of said
     obligations or indebtedness, Debtor hereby transfers, pledges
     and assigns to Secured Party all of Debtor's right, title and
     interest in and to the entire Passenger Revenue, Air Freight,
     non-transportation, IATA, UATP and net settlement amounts
     which are or shall be received for the account of and are or
     shall become payable to Debtor from  Airlines Clearing House,
     Inc., and by Chase Manhattan Bank, N.A. as agent for Airlines
     Clearing House, Inc. including but not limited to all funds
     from such source credited from time to time to the account of
     Debtor maintained with The Chase

<PAGE>

Manhattan Bank, N.A., being Account No. 910-2-480119 or such account or 
accounts as Debtor may maintain with The Chase Manhattan Bank, N.A. for the 
purposes set forth herein. The above-described funds and amounts are 
hereinafter collectively referred to as the "Clearing House Funds". This 
transfer, pledge and assignment is subject to the conditions set forth below.

     2.  AGREEMENT ON ASSIGNMENT:  In order to give effect to Debtor's 
transfer, pledge and assignment of the Clearing House Funds to Secured Party, 
Debtor shall obtain written agreement of The Chase Manhattan Bank, N.A. and 
Airlines Clearing House, Inc., to have all the Clearing House Funds wired 
directly to Secured Party until written authorization is given by Secured 
Party to stop such wiring of Clearing House Funds. The form and content of 
the foregoing written agreement shall be in form and content acceptable to 
Secured Party in its sole discretion. Secured Party agrees to provide written 
authorization to The Chase Manhattan Bank, N.A. to stop wiring of the 
Clearing House Funds to Secured Party, upon payment in full of the New 
Promissory Note obligations, provided Debtor is not otherwise in default 
under the New Loan Agreement as well as the Initial Loans, Airplane Leases, 
and Security Agreement referenced therein or any other obligation owed by 
Debtor to Secured Party. Secured Party agrees to immediately forward to 
Debtor all Clearing House Funds received in excess of the total obligation 
under the New Promissory Note, provided Debtor is not otherwise in default 
under any obligation or agreement with Secured Party.

     3.  DEBTOR'S DEFAULT:  The parties agree that the occurrence of any of 
the following events shall constitute an "Event of Default" hereunder:

     (a)  Debtor's failure to make any timely payment of either principal, 
          interest, late payment charges or any other amount required to be 
          paid under the New Promissory Note, or Debtor's failure to pay any 
          amount required under this Pledge Agreement or the New Loan Agreement,
          (including the Security Agreement, Initial Loans, and Airplane Leases 
          referenced and stated therein);

     (b)  Debtor's failure to perform any promise, agreement, obligation, 
          warranty or covenant made by it herein, in the New Promissory Note, 
          or under the New Loan Agreement (including but not limited to the 
          Security Agreement, Initial Loans and Airplane Leases as referenced 
          therein), if such default is not cured by Debtor within five (5) days 
          of receipt of Secured Party's notice specifying such default;

     (c)  any material misrepresentation made by Debtor to Secured Party in 
          connection with the New Promissory Note, the New Loan Agreement or 
          this Pledge Agreement;


                                       2
<PAGE>

     (d)  entry of a money judgment against Debtor, if such judgment is 
          nonappealable and remains undischarged or unstayed for a period in 
          excess of sixty (60) days;

     (e)  dissolution, termination of existence, insolvency, business failure, 
          inability to pay debts that arise after the date of this Pledge 
          Agreement, assignment for the benefit of creditors, or the 
          commencement, with respect to Debtor, of any proceedings (either 
          voluntary or involuntary) under any bankruptcy or insolvency laws;

     (f)  appointment of a receiver of any material part or all of Debtor's 
          assets or the commencement of any involuntary proceedings against 
          Debtor under any bankruptcy or insolvency laws, if such appointment 
          or proceeding continues for a period of more than sixty (60) days;

     (g)  Debtor entering into any transaction, without the prior written 
          consent of Secured Party, which consent will not be unreasonably 
          withheld, whereby all or substantially all of Debtor's undertakings, 
          property and assets would become the property of any other company, 
          whether by way of reconstruction, reorganization, consolidation,
          amalgamation, merger, transfer, sale or otherwise;

     (h)  default in the payment by Debtor of any indebtedness for borrowed 
          money owed to any creditor other than Secured Party resulting in the 
          acceleration of a material amount of indebtedness greater than 
          U.S. $5,000,000.00 that would reasonably justify Secured Party in 
          deeming itself insecure; or

     (i)  Debtor (or its Permitted Lessee) ceasing to be licensed pursuant to 
          U.S. or other applicable law to operate a commercial air service.

     4.  TERM OF PLEDGE:  This Pledge Agreement shall continue in force and 
effect for as long as Debtor owes any sum of money to Secured Party under the 
New Loan Agreement, or New Promissory Note and provided Debtor is not 
otherwise in default under the New Promissory Note, the New Loan Agreement 
(including the Initial Loans, Airplane Leases and Security Agreement as 
referenced therein) or other obligation from Debtor to Secured Party.  Debtor 
agrees that Secured Party shall be entitled to receive all Clearing House 
Funds as described hereinabove until such time as Secured Party is obligated 
to stop collection of the Clearing House Funds

     5.  RECEIPT OF CLEARING HOUSE FUNDS: The parties agree that immediately 
upon execution of this Pledge Agreement, Secured Party shall be entitled to 
receive the aforesaid

                                       3
<PAGE>

Clearing House Funds directly from The Chase Manhattan Bank N.A. as agent for 
Airlines Clearing House, Inc. and Airlines Clearing House, Inc. if applicable.

     6.  DEBTOR'S SUBORDINATION: In order to facilitate this Pledge Agreement 
and give full effect hereto, Debtor hereby subordinates all right, title and 
interest which it has or may have in the Clearing House Funds to the full 
satisfaction of the claims or Secured Party as provided above. In addition, 
Debtor warrants that it will not give or grant to any third party any right 
to said Clearing House Funds which is superior to that given to Secured Party 
hereunder.

     7.  ADDITIONAL DOCUMENTS: Debtor shall execute such additional documents 
as may be required by Secured Party in order to give full effect to the 
intent and purpose of this Pledge Agreement.

     8.  MISCELLANEOUS: THIS PLEDGE AGREEMENT WAS MADE AND ENTERED INTO IN 
THE STATE OF KANSAS AND THE LAW GOVERNING THIS TRANSACTION SHALL BE THAT OF 
THE STATE OF KANSAS AS IT MAY FROM TIME TO TIME EXIST.  THE PARTIES AGREE 
THAT ANY LEGAL PROCEEDING BASED UPON THE PROVISIONS OF THIS PLEDGE AGREEMENT 
SHALL BE BROUGHT EXCLUSIVELY IN EITHER THE UNITED STATES DISTRICT COURT FOR 
THE DISTRICT OF KANSAS AT WICHITA, KANSAS, OR IN THE EIGHTEENTH JUDICIAL 
DISTRICT COURT OF SEDGWICK COUNTY, KANSAS.  THE PARTIES CONSENT AND AGREE TO 
BE SUBJECT TO THE JURISDICTION OF THE AFORESAID COURTS IN ANY SUCH 
PROCEEDINGS.

     9.  NOTICES: Any notice pertaining to this Pledge Agreement shall be 
deemed sufficiently given if personally delivered or sent by registered or 
certified mail, return receipt requested to the party to whom said notice is 
to be given, sent via telecopy with oral confirmation from a person at the 
receiving office that the transmission has been received, or sent overnight 
air carrier. Notices sent by registered or certified mail shall be deemed 
given on the third day after the date of postmark. Notices hand delivered 
shall be deemed given on the date delivered. Notices forwarded by telecopy 
shall be deemed given upon the foregoing oral confirmation that the 
transmission has been received. Notices sent overnight air carrier shall be 
deemed delivered the day after being forwarded. Until changed by written 
notice given by either party, the addresses of the parties shall be as 
follows:

     Debtor:        Great Lakes Aviation, Ltd.
                    Attn: Chairman
                    1965 330th Street
                    Spencer, IA 51301
                    Telephone: (712) 262-1000
                    Telecopy: (712) 262-1001

                                       4

<PAGE>

     Secured Party:  Raytheon Aircraft Credit Corporation
                     Attn: President
                     10511 East Central
                     Wichita, Kansas 67206
                     Telephone: (316) 676-8471
                     Telecopy: (316) 676-6975

The designated addresses of both parties must be located within the
United States of America allow for overnight air carrier delivery
and be served by telecopy transmission service twenty-four (24)
hours daily.


















                                       5

<PAGE>

     In witness of the mutual promises, covenants and agreements
set forth herein, the parties have caused their duly authorized
officers to execute this Pledge Agreement at Wichita, Kansas on the
day and year first above written.

GREAT LAKES AVIATION, LTD.                  RAYTHEON AIRCRAFT CREDIT
                                            CORPORATION


By: /s/ Douglas G. Voss                     By: /s/ Daniel K. Smartt
    --------------------                        ---------------------
      Douglas G. Voss                              Daniel K. Smartt
         Chairman                                      President

        "Debtor"                                   "Secured Party"


STATE OF _________________    )
                              )  ss:
COUNTY OF ________________    )


     This instrument was acknowledged before me on the day of July,
1997, by Douglas G. Voss, who is the Chairman and Chief Executive
Officer of Great Lakes Aviation, Ltd. on behalf of the corporation.


                                        ___________________________
                                        Notary Public

My Commission Expires:



                                       6



<PAGE>
                                                      EXHIBIT 10.3

             AGREEMENT PERTAINING TO LOANS AND LEASES
                         (GREAT LAKES)

     THIS AGREEMENT PERTAINING TO LOANS AND LEASES (hereinafter
"Agreement") is made this 11th day of July, 1997, by GREAT LAKES
AVIATION, LTD., an Iowa corporation, with its principal place of
business at 1965 330th Street, Spencer, Iowa 51301 (herein called
"Debtor") in favor of RAYTHEON AIRCRAFT CREDIT CORPORATION, whose
principal place of business is 10511 East Central, Wichita, Kansas
67206 (herein called "Secured Party").

                            RECITALS

     A.   Secured Party and Debtor have previously entered into
          certain financial transactions whereby Debtor is
          obligated to Secured Party as evidenced by those certain
          documents described on Exhibit "A" attached hereto
          (collectively referred to as the "Initial Loans".

     B.   Debtor is also obligated to Secured Party pursuant to
          certain airplane lease agreements with Secured Party, as
          specifically described on Exhibit "B" attached hereto
          (collectively referred to as the "Airplane Leases").

     C.   Debtor is in default under the Initial Loans and Airplane
          Leases, as well as certain operational obligations owing
          to third parties. Secured Party has agreed to loan an
          additional Four Million Dollars ($4,000,000.00) to Debtor
          to assist in paying certain financial obligations,
          subject to the terms, conditions and understandings set
          forth herein.

                           AGREEMENT

     NOW, THEREFORE, for valuable considerations, the receipt and
sufficiency of which are hereby acknowledged, Debtor and Secured
Party agree as follows:

     1.   NEW PROMISSORY NOTE. Secured Party agrees to make a new
          loan to Debtor in the sum of Four Million Dollars
          ($4,000,000.00) to be evidenced by a Negotiable
          Promissory Note in the form and content as set forth in
          Exhibit "C" attached hereto ("New Promissory Note").

     2.   SECURITY.  The New Promissory Note as well as the
          financial obligations under the Initial Loans and
          Airplane Leases shall all be secured pursuant to the
          terms of a Security Agreement And Encumbrance Against Air
          Carrier Aircraft


<PAGE>

          Engines, Propellers, Appliances And Spare Parts in the 
          form and content as attached hereto as Exhibit "D" 
          ("Security Agreement"). The New Promissory Note as well
          as all obligations under the Initial Loans and Airplane
          Leases shall also be secured pursuant to the terms of 
          that certain Pledge And Assignment Agreement in
          the form and content as attached hereto as Exhibit "E"
          ("Pledge Agreement"). The Security Agreement and Pledge
          Agreement shall grant to Secured Party a first lien
          perfected security interest (subject to any prior liens
          in favor of Secured Party) in the following property:

               All accounts receivable of Debtor, of any kind or
               nature, now existing or hereafter arising, whether
               arising out of or pertaining in any manner to the
               business operations of Debtor, and all proceeds,
               renewals, replacements, additions or substitutions
               thereof, including but not limited to all of
               Debtor's right, title and interest in and to the
               entire net settlement amounts of passenger revenue,
               air freight, nontransportation, IATA, UATP, and
               other receipts, and payments and revenues, which
               are or shall be received for the account of and are
               or shall become payable to Debtor by Airlines
               Clearing House, Inc. including but not limited to
               all amounts payable by Chase Manhattan Bank, N.A.
               as agent for Airlines Clearing House, Inc.
               ("Clearing House Funds"). Any funds received by
               Debtor from the Brazilian government every six
               months shalt be excluded from the foregoing.

               All of Debtor's air carrier aircraft engines,
               propellers, appliances, spare parts, avionics,
               accessories, instruments, rotables, equipment
               (including ground support equipment),
               subassemblies, tools, kits, consumables, components
               and related items for installation in or use in
               connection with Debtor's Beechcraft Model 1900 type
               airplanes now owned or hereinafter acquired by
               Debtor  (collectively hereinafter collectively
               "Spare Parts").

               All of the foregoing is collectively referred to as
               the "Collateral."

     Debtor hereby covenants and warrants that it holds legal title
     to all of the Collateral free and clear of any security
     interests, liens or encumbrances of any nature whatsoever
     (except prior liens and encumbrances in favor of Secured
     Party), and that Debtor has full authority to encumber the
     Collateral and grant the aforesaid security interest in favor
     of Secured Party. Secured Party acknowledges that certain
     off-sets occur automatically to the Clearing House Funds for
     payments of transportation and non-transportation charges.
     Debtor agrees to cause no portion of said Clearing House Funds
     to be offset or used in any manner for non-transportation
     charges, including current or future rental obligations owing
     to United Airlines, except for those items


                                       2
<PAGE>


     as specifically set forth on Exhibit "F" attached hereto 
     ("Allowed Offsets To Clearing House Funds").

     This Agreement, the New Promissory Note, Pledge Agreement,
     Security Agreement and other documents referenced in said
     documents, are herein referred to collectively as the
     "Governing Documents".

     3.   USE OF LOAN PROCEEDS.  It is expressly agreed by the
          parties hereto that a portion of the loan proceeds from
          the New Promissory Note shall be retained by the Secured
          Party and credited toward the payment and satisfaction of
          certain current obligations under the Initial Loans and
          Airplane Leases in the amounts and for the obligations
          enumerated in attached Exhibit UG" along with payment of
          attorneys' fees and costs of Secured Party not to exceed
          $10,000.00 (in the event Debtor restructures it financial
          obligations, without filing for bankruptcy protection,
          Secured Party shall refund such attorneys' fees to
          Debtor), with the balance of the loan proceeds to be
          disbursed to Debtor and utilized for the obligations
          specified on attached Exhibit "H". No portion of the loan
          proceeds shall be utilized by Debtor for amounts due
          secured or unsecured creditors of Debtor, except as
          provided in "Exhibit G" or any payments owing to United
          Airlines relating in any manner to rent or other
          obligations, including but not limited to rental on the
          Denver Airport space. Debtor agrees to obtain a
          modification to all agreements and amounts past due and
          owing to United Airlines, in form and content acceptable
          in all respects to Secured Party ("United Airlines
          Modification").

     4.   SPARE PARTS. ACCESSORIES. EQUIPMENT. Debtor will arrange
          for Secured Party's representatives to inspect and
          inventory the Spare Parts during the month of July, 1997,
          at such time(s) as required or requested by Secured
          Party. Debtor covenants and warrants it will promptly
          furnish such information and execute and deliver such
          further documents, including further UCC-1 financing
          statements and FAA filings, and do all other such acts
          and things as Secured Party may reasonably request in
          order to perfect its security interest in all the Spare
          Parts and to allow compilation of further detail for a
          complete list of all such items and their location, and
          to allow updates to the Security Agreement and
          accompanying UCC-1 financing statements thereon, and
          accompanying FAA filing(s) thereon.

     5.   REAFFIRMATION OF INDEBTEDNESS/LEASES. Debtor hereby
          reaffirms the validity of each of the Initial Loans and
          Airplane Leases, acknowledges and agrees that the current
          balances owing under each of said Initial Loans and
          Airplane Leases are as set forth on Exhibit "A" and
          Exhibit "B" (except as to aircraft bearing serial numbers
          UC 101 and 105) respectively, that each of the Initial
          Loans and Airplane Leases is in full force and effect,
          that no off-sets or


                                       3

<PAGE>

          defenses exist as to such amounts and future obligations 
          thereunder and remain the valid, effective and enforceable 
          obligations of Debtor. Secured Party hereby acknowledges 
          and agrees that amounts currently past due and owing under 
          the Initial Loans and Airplane Leases shall be paid (along 
          with all default charges, interest and related amounts 
          thereto) on July 29, 1997.

     6.   CONDITIONS PRECEDENT TO LOAN CLOSING. The following
          conditions are precedent to closing of the New Promissory Note:

          a.   DIRECT PAYMENT FROM CLEARING HOUSE FUNDS. A written
               agreement shall be obtained by Debtor with Airlines
               Clearing House, Inc. and Chase Manhattan Bank,
               N.A., as agent for Airlines Clearing House, Inc.,
               in favor of Secured Party, wherein they shall agree
               to cause all Clearing House Funds to be wired
               directly to Secured Party on the date normal
               disbursements are made thereunder, subject to the
               amounts United Airlines shall be entitled to bill
               to Airlines Clearing House, Inc. in accordance with
               the United Airlines Modification.

          b.   UNITED AIRLINES MODIFICATION. The written United
               Airlines Modification is obtained in form and
               content acceptable to Secured Party, which shall
               include a restructured payment schedule for
               Debtor's obligations to United Airlines and confirm
               the subordination from United Airlines as to all
               Clearing House Funds, allowing Secured Party to
               hold a senior first lien as to said items and
               receive direct payment of the Clearing House Funds.

          c.   PAYMENT OF FEES AND COSTS. Debtor shall pay Secured
               Party from the loan proceeds for all fees, costs
               and expenses, including attorneys' fees, relating
               in any manner to the initial documentation of the
               New Promissory Note and related transaction, in an
               amount not to exceed $10,000.00.

          d.   VALID LIENS. The Security Agreement and Pledge
               Agreement shall have been fully executed,
               appropriate UCC-1 financing statements and FAA
               filings have been fully executed.

          e.   CODE SHARE AGREEMENT. Debtor shall obtain written
               confirmation from United Airlines that the code
               share agreement shall continue in effect through
               August 31, 1997.

          f.   LEGAL OPINION. A legal opinion from Debtor's
               counsel confirming the validity of this Agreement,
               the New Promissory Note, the Pledge Agreement, the
               Security Agreement and other documents related to this

                                       4
<PAGE>

               transaction, as well as the validity of the
               lien interests being created thereby and authority
               of the person signing all documents on behalf of
               Debtor.

     All of the foregoing agreements, documents and confirmations
     shall be in such form and content as approved and accepted by
     Secured Party, in its sole discretion.

     7.   CONDITIONS TO BE MET FOLLOWING LOAN CLOSING. Debtor shall
          undertake and diligently prosecute in an expeditious and
          timely manner, each of the following items following
          closing of the New Promissory Note transaction:

          a.   CREDITOR RESTRUCTURE. Debtor shall obtain a
               restructure of all its indebtedness on all aircraft
               financing with third parties in order that all
               financial obligations owing to said third party for
               amounts currently past due and payable shall be
               extended in full for a minimum of 120 days from the
               date hereof, and shall cause amounts that become
               due after the date hereof to include step down
               payments in order that not more than 25% of the
               first month's payment, 50% of the second month's
               payment, and 75% of the third month's payment
               accruing hereafter is paid in the first, second and
               third months, respectively, from the date of this
               Agreement (with the unpaid portion each month to be
               extended until after 120 days from the date of this
               Agreement. In addition, Debtor shall obtain
               uncollateralized notes to all unsecured creditors
               for trade payables and otherwise, for each
               indebtedness owing to any single creditor in the
               amount of $20,000 or more, to allow payoff over a
               one year period at an interest rate not to exceed
               12% per annum with equal monthly payments of
               principal and interest.

          b    Debtor shall diligently proceed with, and prosecute
               enrollment (at competitive market rates) of all
               1900 Airliner engines in Pratt & Whitney's Fleet
               Maintenance Program and complete such enrollment no
               later than October 1, 1997. This provision does not
               require Debtor to purchase retroactive enrollment
               of the engines.

          c    Debtor agrees to actively investigate other cash
               sources and restructure strategies and update
               Secured Party on a weekly basis pursuant to a
               written report showing said strategies, cash
               sources and other activities of material impact on
               the business operations of Debtor.

          d    Debtor shall issue warrants to Secured Party for
               one million common shares of Debtor at a strike
               price of 0.75 per share. The warrants shall be
               exercisable for a period commencing one year from
               the date of issuance and terminating ten (10) years
               from such issuance, All

                                       5
<PAGE>

               documents pertaining to said warrants shall be 
               prepared by Debtor and presented to Secured Party 
               within two (2) weeks following close of the loan, 
               and Debtor agrees to negotiate in good faith as to 
               all requested changes in the language, terms, and 
               provisions of said warrant documents. Secured Party 
               shall have no obligation to pay any monies or consideration
               for issuance of the warrants, other than the granting
               of the New Promissory Note loan to Debtor pursuant
               to this Agreement. Debtor hereby acknowledges
               receipt of good and valuable consideration for
               issuance of the warrants hereunder, and agrees that
               the value of issuance of said warrants shall be
               $2,000.00.

          e.   Prior to July 29, 1997, Secured Party and Debtor
               shall meet to determine if it is in the best
               interests of both parties to (i) extend the date
               that certain of Debtor's obligations arising out of
               this Agreement are due, for the purpose of allowing
               Debtor additional time to restructure its financial
               obligations and (ii) revise Secured Party's
               security, pledge and other agreements for the
               purpose of restructuring the Debtor's financial
               obligations.

     8.   REPRESENTATIONS AND WARRANTIES.  Debtor represents and
          warrants to Secured Party that: 

          a.   ORGANIZATION. ETC. Debtor is a corporation duly
               organized, validly existing and in good standing
               under the laws of the State of Iowa and is
               qualified to do business in each jurisdiction where
               such qualification is legally required, and is
               entitled to own property in the place where such
               property is now owned or leased and is empowered to
               conduct business as now conducted. Debtor has not
               carried on business under any name except United
               Express, Midway Connection, Arizona Airways
               Express, Great Lakes Airlines and that shown in
               this Agreement within five (5) years of the date of
               this Agreement.

          b.   AUTHORITY AND ENFORCEABILITY. Debtor has full power
               to enter into and perform its obligations under
               this Agreement, the New Promissory Note, Security
               Agreement and Pledge Agreement and all other
               documents contemplated hereby or executed pursuant
               hereto. The execution and delivery of this
               Agreement, the New Promissory Note, Security
               Agreement, Pledge Agreement and all other documents
               contemplated hereby or executed pursuant hereto and 
               the performance and observance of their terms, 
               conditions and obligations have been duly authorized 
               by all necessary action on the part of Debtor. This 
               Agreement, the New Promissory Note, Security Agreement, 
               Pledge Agreement and all other documents contemplated 
               hereby or executed 

                                       6

<PAGE>

               pursuant hereto constitute, when executed and 
               delivered by Debtor to Secured Party, valid and 
               binding obligations of Debtor enforceable in 
               accordance with their terms.

          c.   NO CONFLICT. The execution and delivery of this
               Agreement, and other documents contemplated hereby
               and thereby, do not and will not conflict with, or
               be in contravention of, any law, order, rule or
               regulation applicable to Debtor or any agreement or
               instrument to which Debtor is a party or by which
               any of its property is bound or affected.

          d.   FINANCIAL CONDITION. Except for the absence of
               notes to the monthly Financial Statement, all
               Financial Statements furnished to Secured Party for
               the purpose of establishing financial
               responsibility of Debtor in connection with this
               Agreement were prepared in accordance with
               generally accepted accounting principles
               consistently applied throughout the periods
               involved, and fairly present the financial
               conditions and results of operation of Debtor for
               the period through March 31, 1997. Without limiting
               the generality of the foregoing, Debtor does not
               know of any material contingent liabilities that it
               may have that were not reflected in the Financial
               Statements. Since the date of the Financial
               Statements there has been no:

               i.   material adverse change in Debtor's financial
                    conditions, assets, liabilities or business,
                    except as has been previously disclosed in
                    writing to Secured Party and except for the
                    voluntary suspension on May 16, 1997 of
                    operations and subsequent consent decree with
                    the FAA;

               ii.  damage, destruction or loss, whether covered
                    by insurance or not so covered, materially
                    adversely affecting Debtor's properties or
                    business;

               iii. declaration, setting aside or payment of any
                    dividend or other distribution in respect to
                    Debtor's equity securities; nor

               iv.  loans to officers, directors, shareholders,
                    warrant holders or  other equity participants
                    in Debtor.

          e.   LITIGATION. There is no action, suit, legal
               proceeding or other proceeding pending or, to the
               best knowledge of Debtor's officers, directors and
               legal counsel, threatened against Debtor or
               affecting the properties or assets of Debtor in any
               court or before any arbitrator of

                                       7

<PAGE>

               any kind or before or by any governmental body, except
               as set forth in Exhibit "I" hereto. Debtor is not in
               default with respect to any order of any court,
               arbitrator or governmental body, and is not subject
               to or a party to any order of any court or
               governmental body arising out of any action, suit
               or proceeding under any statute or other law
               respecting antitrust, monopoly, restraint of trade,
               unfair competition or similar matters. For the
               purposes of this section, the term "governmental
               body". includes any federal, state, municipal or
               other governmental department, commission, bars,
               bureau, agency or instrumentality, domestic or
               foreign, and the term "order" includes any other,
               writ, injunction, decree, judgment, award,
               determination, direction or demand.

          f.   TAXES. Debtor has filed all federal, state and
               local tax returns that are required to be filed and
               has paid all taxes shown on such returns and on all
               assessments received by it to the extent that such
               taxes and assessments have become due. All federal
               and state income taxes and all other taxes and
               assessments of any nature pertaining to Debtor's
               business, assets and operations have been paid when
               due, including but not limited to payroll,
               withholding obligations, and personal property
               taxes.

          g.   TITLE.  Title to all Collateral is (or will be,
               with respect to Collateral hereafter acquired)
               vested solely in Debtor, free and clear of all
               liens, encumbrances and other claims whatsoever,
               except as otherwise approved in writing by Secured
               Party. Debtor has not made any contract or
               arrangement of any kind which could give rise to a
               lien on the Collateral, except as provided herein,
               and the granting of such lien is not contemplated
               by Debtor.

          h.   NO DEFAULT. There is no Event of Default or breach
               on the part of Debtor under this Agreement and no
               event has occurred which with notice or the passage
               of time or both would constitute an Event of
               Default or breach hereunder.

          i.   INFORMATION CORRECT. Except for financial
               projections, all information furnished in any
               document required to be furnished by Debtor to
               Secured Party under or in connection with this
               Agreement is accurate and complete in all material
               respects.

          j.   LOANS TO DIRECTORS OR OFFICERS. Debtor has no loans
               or leases with any past or present director,
               officer or employee, including their spouses


                                       8
<PAGE>

               and any entity in which any said person holds an
               equity, officer or director relationship.

          k.   CLEARING HOUSE FUNDS OFFSETS. Debtor shall cause no
               offsets to the Clearing House Funds different from
               past operations, and shall allow only the
               non-transportation charges to be offset as set
               forth on Exhibit "F" attached hereto.

     9.   AFFIRMATIVE COVENANTS. Until payment or performance in
          full of all obligations, Debtor shall:

          a.   PAY NEW PROMISSORY NOTE. Duly and punctually pay or
               cause to be paid the principal and interest on the
               New Promissory Note on the date, in the places and
               in the manner set forth therein, and perform and
               observe all other obligations of Debtor under the
               Initial Loans, Airplane Leases, this Agreement, the
               Pledge Agreement and the Security Agreement.

          b.   COMPLIANCE WITH LAWS: Comply promptly with all
               laws, rules, regulations, resolutions, ordinances
               and codes applicable to the business of Debtor and
               keep in effect all permits or approvals obtained in
               connection therewith.

          c.   ACCOUNTS AND RECORDS. Keep and maintain full and
               accurate accounts and records of its operations in
               accordance with generally accepted accounting
               principles applicable to businesses of the type in
               which Debtor is engaged and consistent with
               principles heretofore applied by Debtor in
               preparation of the Financial Statements, and permit
               Secured Party by its duly authorized agents to
               inspect such accounts and records at any reasonable
               time.

          d.   INSPECTION. Permit Secured Party or its duly
               authorized agents to inspect all of Debtor's
               property wherever located, whether owned or leased,
               at any reasonable time. 

          e.   MAINTAIN EXISTENCE. Maintain and preserve the
               corporate existence of Debtor in good standing
               under the laws of the State of Iowa and maintain
               its right to transact business in all other states
               where its activities and ownership of assets is
               such that qualification to transact business is
               necessary under the laws of such  states.

          f.   NOTIFICATIONS.  Promptly notify Secured Party in
               writing of the occurrence of:

                                       9
<PAGE>

               i.   any Event of Default;

               ii.  any material adverse change in the business,
                    property, assets, operations or condition,
                    financial or otherwise, of Debtor; and

               iii. the pendency or threat of any material
                    litigation, arbitration, or any material tax
                    deficiency or other proceeding before any
                    governmental body or official affecting
                    Debtor.

          g.   PAYMENT OF TAXES, ETC.  Duly and punctually pay and
               discharge all taxes, assessments and other charges
               against Debtor prior to the date when they shall
               become delinquent and all charges for labor,
               materials and supplies that if unpaid might become
               a lien against any part of the Collateral of
               Debtor, unless contested in good faith and by
               appropriate proceedings and provided that Debtor
               shall have furnished Secured Party with adequate
               security for the payment thereof, including without
               limitation bonds or similar security. 

          h.   FURTHER ASSURANCES. From time to time record,
               register and file all such notices, statements and
               other documents and take such other steps,
               including but not limited to the amendment of the
               Security Agreement and Pledge Agreement, as may be
               necessary or advisable to render fully valid and
               enforceable under all applicable laws the rights,
               liens and priorities furnished under this Agreement
               or intended to be so furnished, in each case in
               such form and at such times as shall be
               satisfactory to Secured Party, and pay all fees and
               expenses incident to compliance with this
               paragraph.

     10   NEGATIVE COVENANTS OF DEBTOR. Until payment and
          performance in full of all of the obligations, Debtor
          shall not without the prior written consent of Secured
          Party:

          a.   LIENS. Create, assume, incur or suffer to exist any
               mortgage, pledge, security interest, lien or other
               encumbrance upon the Collateral, without the
               written consent of Secured Party.
          
          b.   ASSIGNMENT. Assign or attempt to assign any of its
               rights or delegate any of its duties hereunder,
               under the Security Agreement or the Pledge
               Agreement or under the New Promissory Note.

          c.   CHANGE BUSINESS. Change materially the nature of
               the business conducted by Debtor, engage to any
               material extent in a kind of business materially
               different from that presently conducted or change

                                       10
<PAGE>

               Debtors fiscal year. Debtor shall not enter into
               any new business arrangement that expands routes,
               or purchase or lease any new aircraft, prior to
               notifying Secured Party of such arrangement.

          d.   LOANS.  Make loans or advances from Debtor to its
               officers or directors or persons or entities in any
               manner related to such officers and directors.

          e.   EXTENDED LIABILITY. Assume, create, guarantee,
               endorse, contingently agree to purchase or
               otherwise become liable upon the obligation of any
               person, firm or corporation, except by endorsement
               of negotiable instruments for deposit or collection
               except for business in the ordinary course in
               accordance with prior operations, for an amount in
               excess of $100,000.00.

     11  EVENTS OF DEFAULT AND REMEDIES.

          a.   EVENTS OF DEFAULT. The occurrence of any one or
               more of the following events or existence of one or
               more of the following conditions shall constitute
               an Event of Default under this Agreement:

               i.   Debtor's failure to make any timely payment of
                    either principal, interest, late payment
                    charges or any other amount required to be
                    paid hereunder, or Debtor's failure to pay any
                    amount required under the New Note, Security
                    Agreement, Pledge Agreement, Initial Loans
                    and/or Airplane Leases. Secured Party hereby
                    acknowledges and agrees that amounts currently
                    due and owing under the Initial Loans and
                    Airplane Leases, (other than the obligations
                    being paid out of the loan proceeds hereunder)
                    shall be deemed extended (along with all
                    default charges interest and related amounts
                    thereto), until July 29, 1997;

               ii.  Debtor's failure to perform any non-monetary
                    promise, agreement, obligation, warranty or
                    covenant made by it herein or in the Pledge
                    Agreement or Security Agreement, if such 
                    default is not cured by Debtor within five (5)
                    calendar days of receipt of Secured Party's
                    notice specifying such default;

               iii. five (5) calender days after Secured Party
                    provides Debtor with written notice of any
                    material misrepresentation made by Debtor to
                    Secured Party in connection with the Pledge
                    Agreement, Security Agreement or this
                    Agreement, provided that Secured Party is
                    materially prejudiced thereby;

                                       11
<PAGE>

               iv.   entry of a money judgment against Debtor, if
                     such judgment is nonappealable and remains
                     undischarged or unstayed for a period in
                     excess of sixty (60) days;

               v.    dissolution, termination of existence,
                     insolvency, business failure, inability to pay
                     debts that arise or accrue after the date of
                     this Agreement as they mature, assignment for
                     the benefit of creditors, or the commencement,
                     with respect to Debtor of any proceedings
                     (either voluntary or involuntary) under any
                     bankruptcy or insolvency laws;

               vi.   appointment of a receiver of any material part
                     or all of Debtor's assets or the commencement
                     of any involuntary proceedings against Debtor
                     under any bankruptcy or insolvency laws, if
                     such appointment or proceeding continues for a
                     period of more than sixty (60) days;

               vii.  Debtor entering into any transaction, without
                     the prior written consent of Secured Party,
                     which consent will not be unreasonably
                     withheld, whereby all or substantially all of
                     Debtor's undertakings, property and assets
                     would become the property of any other
                     company, whether by way of reconstruction,
                     reorganization, consolidation, amalgamation,
                     merger, transfer, sale or otherwise;

               viii. default in the payment by Debtor of any
                     indebtedness for borrowed money owed to
                     any creditor other than Secured Party
                     resulting in the acceleration of a
                     material amount of indebtedness greater
                     than U.S. $5,000,000.00 that would
                     reasonably justify Debtor in deeming
                     itself insecure;

               ix.  Debtor (or its Permitted Lessee) ceasing to be
                    licensed pursuant to U.S. or other applicable
                    law to operate a commercial air service; or

               x.   any representation or warranty made under this
                    Agreement or otherwise made in writing to
                    Secured Party, or in connection with the
                    making of the loan or any certificate,
                    statement or report made pursuant to this
                    Agreement by Debtor shall prove at any time to
                    have been false or misleading in any material
                    respect when made; however Debtor shall have
                    five (5) business days following receipt of
                    notice from Secured Party advising Debtor of a
                    violation under this paragraph, to cure

                                      12
<PAGE>

                    such violation.  Furthermore, Debtor may commence
                    or maintain litigation in good faith
                    protecting its property, without violating
                    this provision.

               xi.  Debtor shall fail to perform or observe any
                    covenant contained in this Agreement for five
                    (5) business days after written notice from
                    Secured Party, or five (5) business days after
                    Debtor is aware of such failure, if sooner.

          b.   REMEDIES.

               i.   Upon the occurrence of any Event of Default
                    and thereafter, the loan, with all accrued
                    interest and other amounts payable hereunder,
                    together with all other obligations of Debtor
                    to Secured Party, including but not limited to
                    the obligations under the Initial Loans and
                    Airplane Leases, shall, at the option of
                    Secured Party, become immediately due and
                    payable without presentment, demand, protest
                    or other notice of any kind, all of which are
                    expressly waived by Debtor. Secured Party may
                    proceed with every remedy available at law or
                    equity or provided for herein or in any
                    document executed in connection herewith or in
                    connection with the Initial Loans and the
                    Airplane Leases, and all expenses incurred by
                    Secured Party in connection with any remedy
                    shall be deemed indebtedness of Debtor to
                    Secured Party and a part of the obligations
                    hereunder.  Secured Party may apply the
                    proceeds from any Collateral or any other
                    source against any of the indebtedness from
                    Debtor to Secured Party as and in any order
                    Secured Party sees fit.

               ii.  Without limiting the foregoing, upon the
                    occurrence of an Event of Default hereunder
                    Secured Party shall have all the rights
                    provided in the Governing Documents, as well
                    as the right to take possession of the
                    Collateral and take any action it deems
                    advisable or necessary to protect the
                    Collateral. Debtor hereby irrevocably
                    constitutes and appoints Secured Party its
                    attorney-in-fact with full power and authority
                    upon the occurrence of an Event of Default to:

                    (a)  take possession of any property covered
                         hereby;

                    (b)  employ such employees, contractors,
                         subcontractors, agents and other persons
                         that Secured Party deems necessary or
                         desirable to protect the Collateral;



                                       13
<PAGE>


                    (c)  pay, settle or compromise all existing
                         invoices, charges and claims relating to
                         the Collateral for protection of its
                         interest; and

                    (d)  prosecute and defend all actions and
                         proceedings in connection with Debtor's
                         business and to apply the proceeds of any
                         judgment received by Debtor in any such
                         action against any of the obligations as
                         it sees fit.

               No delay or failure of Secured Party in the
               exercise of any right or remedy provided for
               hereunder shall be deemed a waiver of the right by
               Secured Party, and no exercise or partial exercise
               or waiver of any right or remedy shall be deemed a
               waiver of any further exercise of such right or
               remedy or of any other right or remedy that Secured
               Party may have. The enforcement of any rights of
               Secured Party as to any security for the loan shall
               not affect the rights of Secured Party to enforce
               payment of the New Promissory Note and to recover
               judgment for any portion thereof remaining unpaid.
               The rights and remedies herein expressed are
               cumulative and not exclusive of any right or remedy
               that Secured Party shall otherwise have. Further,
               nothing contained herein shall obligate Secured
               Party to undertake any action unless required by
               law.

          12        RIGHTS AND DUTIES OF SECURED PARTY.

          a.   RELATIONSHIP. Nothing herein shall be construed as
               establishing a relationship between Secured Party
               and any other party except the secured
               party-borrower relationship between Secured Party
               and Debtor.

          b.   RIGHT TO ASSIGN. Secured Party may assign,
               negotiate, pledge or otherwise hypothecate this
               Agreement, the New Promissory Note, Pledge
               Agreement and Security Agreement or any of its
               rights and security hereunder or thereunder. In
               case of such assignment, Debtor will accord full
               recognition thereto and hereby agrees that all
               rights and remedies of Secured Party in connection
               with the interest so assigned shall be enforceable
               against Debtor by the assignee thereof.

          13   NOTICES. Any notice pertaining to this Agreement
               shall be deemed sufficiently given if personally
               delivered or sent by registered or certified mail,
               return receipt requested, to the party to whom said
               notice is to be given, or sent via telecopy with
               oral confirmation from a person at the receiving
               office that the transmission has been received,

                                       14
<PAGE>

               or sent overnight carrier. Notices sent by registered
               or certified mail shall be deemed given on the
               third day after the date of postmark. Notices hand
               delivered shall be deemed given on the date
               delivered. Notices forwarded by telecopy shall be
               deemed given upon the foregoing oral confirmation
               that the transmission has been received. Notices
               sent overnight carrier shall be deemed delivered
               the day after being forwarded.

          a.   If to Debtor:

               Great Lakes Aviation, Ltd.
               Attention: President
               1965 330th Street
               Spencer, Iowa 51301
               Telephone Number: (712) 262-1000
               Telecopy Number: (712) 262-1001

          b.   If to Secured Party:

               Raytheon Aircraft Credit Corporation
               Attention: President
               9709 E. Central
               Wichita, Kansas 67206
               Telephone Number: (316) 676-7673
               Telecopy Number: (316) 676-6975

          The designated addresses of both parties must be located
          within the United States of America and allow for Federal
          Express delivery and served by telecopy transmission
          service twenty-four (24) hours daily. Any party may
          change its address for the giving of notice hereunder by
          notice so given.

     12        MISCELLANEOUS.

     a.   AMENDMENTS. No provision or term of this Agreement may be
          amended, modified, revoked, supplemented, waived or
          otherwise changed except by a written instrument duly
          executed by Debtor and Secured Party and designated as an
          amendment, supplement or waiver.

     b.   COUNTING OF DAYS. If any time period ends on other than
          a business day, the period shall be deemed to end on the
          next succeeding business day.

                                       15
<PAGE>

     c.   COMPUTATIONS. All computations of interest and fees made
          or called for hereunder shall be made on the basis of a
          year of 360 days and actual day months.

     d.   COUNTERPARTS. This Agreement may be executed
          simultaneously in two or more counterparts, each of which
          shall be deemed an original.

     e.   HEADINGS. The paragraph headings herein are for
          convenience only and shall not affect the construction
          hereof.

     f.   CONFLICT. If the terms of the Pledge Agreement or
          Security Agreement shall conflict with this Agreement,
          this Agreement shall govern to the extent of the
          conflict.

     g.   USE OF TERMS. As used herein, words in any gender shall
          be deemed to include the other gender and the singular
          shall be deemed to include the plural, and vice versa.

     h.   SEVERABILITY. If any provision in this Agreement shall be
          held invalid, illegal or unenforceable in any
          jurisdiction, the validity, legality and enforceability
          of the remaining provisions of this Agreement shall not
          be impaired thereby, nor shall the validity, legality or
          enforceability of any such defective provisions be in any
          way affected or impaired in any other jurisdictions.

     i.   GOVERNING LAW AND FORUM CHOICE. This Agreement was made
          and entered into in the State of Kansas and the law
          governing this transaction shall be that of the State of
          Kansas as it may from time to time exist. The law of the
          State of Kansas shall apply to any and all matters
          arising from or related to this Agreement and should an
          "Event of Default" occur, such as an action to obtain
          possession of and foreclose upon the Collateral, and all
          other remedies which may be available including seeking
          a deficiency judgment against Debtor. The parties agree
          that any legal proceeding based upon the provisions of
          this Agreement shall be brought exclusively in either the
          United States District Court of the District of Kansas at
          Wichita, Kansas, or in the Eighteenth Judicial District
          Court of Sedgwick County, Kansas, to the exclusion of all
          other courts and tribunals. Notwithstanding the above, in
          the event of an "Event of Default", Secured Party (at its
          sole option) may institute a legal proceeding in any
          jurisdiction as may be appropriate in order for Secured
          Party to obtain possession of and foreclose upon the
          Collateral. The parties hereby consent and agree to be
          subject to the jurisdiction of the aforesaid courts in
          such proceedings.

                                       16
<PAGE>

     j.   EXHIBITS. Exhibits "A", "B", "C", "D", "E", "F", "G",
          "H", and "I" are attached hereto and incorporated herein.

     k.   ENTIRE AGREEMENT.  The Governing Documents constitute the
          entire agreement between Secured Party and Debtor
          concerning the subject matter of this Agreement, and
          supersede any prior written or oral agreements between
          Secured Party and Debtor concerning the subject matter
          hereof.

EXECUTED as of the day and year first set forth above.

                    GREAT LAKES AVIATION, LTD., an Iowa
                    corporation


                    By: /s/ Douglas G. Voss
                        -------------------------------------
                        President

                    Date:  July 11, 1997
                           ----------------------------------


                    RAYTHEON AIRCRAFT CREDIT CORPORATION


                    By:   /s/ Daniel K. Smartt
                          -----------------------------------
                           President

                    Date:  July 11, 1997
                           ----------------------------------


                                      17


<PAGE>
                                                               EXHIBIT 10.4



  SECURITY AGREEMENT AND ENCUMBRANCE AGAINST ALL CARRIER AIRCRAFT
        ENGINES, PROPELLERS, APPLIANCES AND SPARE PARTS 
                                
              [Pursuant to 14 CFR Section 49.51 et seq.]
                                
          Aircraft Owner:  Great Lakes Aviation, Ltd.
                                
                Aircraft Operator:  Great Lakes
                                
         Spare Parts Locations:  See Attached Exhibit C

     This Security Agreement And Encumbrance Against Air Carrier
Aircraft Engines, Propellers, Appliances And Spare Parts ("Security
Agreement") is made and entered into on this 11th day of July,
1997, by and between GREAT LAKES AVIATION, LTD., an Iowa
corporation, with its principal place of business at 1965 - 330th
Street, Spencer, Iowa 51301 (hereinafter "Debtor"), and RAYTHEON
AIRCRAFT CREDIT CORPORATION, a Kansas corporation, with its
principal place of business at 10511 East Central, Wichita, Kansas
67206 (hereinafter "Secured Party"). This Security Agreement is
sometimes hereinafter referred to as the "Agreement".

     In consideration of the mutual promises, covenants and
representations set forth herein, the Negotiable Promissory Note
executed of even date hereof (hereinafter "New Promissory Note")
and the Agreement Pertaining To Loans And Leases executed of even
date hereof (hereinafter "New Loan Agreement"), the parties hereto
agree as follows:

     1.   GRANT OF SECURITY INTEREST.   To secure the payment of
Debtor's obligation under the New Promissory Note executed in
conjunction with this Security Agreement and dated of even date
hereof, together with any and all other indebtedness owed by Debtor
to Secured Party as described in the New Loan Agreement as well as
Exhibits A and B attached hereto (whether now existing or hereafter
arising), as well as any renewals, extensions or changes in the
form of said obligation or indebtedness, Debtor grants to Secured
Party a security interest in: (a) all of the aircraft engines
identified on Exhibit D attached hereto and incorporated herein by
reference (the "Engines"), which Engines are rated at 750 or more
takeoff horsepower or the equivalent; and (b) all of the air
carrier aircraft engines, propellers, appliances, spare parts,
avionics, accessories, instruments, rotables, equipment (including
ground support equipment), subassemblies, tools, kits, consumables,
components and related items for installation in or use in
connection with Debtor's Beechcraft Model 1900 type airplanes
(hereinafter collectively "Spare Parts") which Debtor owns. Debtor
grants to Secured Party a security interest in all of the aforesaid
Engines and Spare Parts, whether now existing or hereafter
acquired. In order to allow Secured Party to record and perfect its
security interest in the Engines and Spare Parts pursuant to 14 CFR
Section 49.51 et seq.,  Debtor hereby covenants and agrees that:

<PAGE>

     (i)  Debtor is an air carrier holding a certificate issued
          under 40 U.S.C. Section 44705; and

     (ii) All of the above-mentioned Spare Parts will at all times
          and until installed or used (in the ordinary course of
          Debtor's business) in an aircraft belonging to Debtor, be
          located and stored at Debtor's facilities or hangars at
          the locations listed on Exhibit C. Debtor shall not
          warehouse, inventory or store any of the Spare Parts at
          any other location without first obtaining the written
          consent of Secured Party and without first executing and
          filing with the FAA Registry a certificate pursuant to
          applicable sections of the Code or Federal Regulations
          evidencing such change of location and such other
          documents as may be required by Secured Party.

     The above-described Engines and Spare Parts in this Section 1
are sometimes hereinafter collectively referred to as the
"Collateral."

     2.   DEBTOR'S WARRANTY OF TITLE.  Except for the security
interest granted herein or previously granted Secured Party, Debtor
warrants that it is (or, to the extent the Collateral is to be
acquired hereafter, will be) the owner of the Collateral free from
any security interest, lien or encumbrance. Debtor further warrants
that it will defend the Collateral against all claims and
demands of any person claiming any interest therein by virtue of
any such security interest, lien or encumbrance.

     3.   DEBTOR WILL EXECUTE AND DELIVER DOCUMENTS.  At Secured
Party's request, Debtor shall promptly furnish such information and
execute and deliver such documents and do all such acts and things
as Secured Party may reasonably request as are necessary or
appropriate to assist Secured Party in establishing and maintaining
a valid security interest in the Collateral and that the security
interest granted hereby is perfected to Secured Party's satisfac-
tion. Debtor will pay the cost of filing all appropriate documents
in all public offices where Secured Party deems such filings
necessary or desirable.

     4.   OPERATION, MAINTENANCE AND REPAIR.  Debtor shall use,
operate, maintain, store and repair the Collateral and retain
actual control and possession thereof in accordance with each of
the following provisions:

     (a)  Debtor shall use, maintain, store and repair the
          Collateral properly, carefully and in complete compliance
          with all applicable statutes, ordinances, regulations,
          policies of insurance, manufacturer's recommendations and
          manufacturer's operating and maintenance manuals and
          handbooks.

     (b)  Debtor shall properly maintain all records pertaining to
          the maintenance, operation and repair of the Collateral.

     5.   INSURANCE.  Debtor shall, at all times and at its
sole expense, obtain and carry insurance coverage in an amount not
less than the full insurable value of the Collateral.  All policies
of insurance carried in accordance with this section 5 shall name
Secured Party as a loss payee and


                                       2
<PAGE>

provide that the insurance proceeds from any loss involving the 
Collateral shall be payable to Secured Party up to the amount of 
the unpaid principal and accrued interest owed by Debtor under the 
New Promissory Note or other indebtedness from Debtor to Secured Party.
The policies shall include coverage against the perils of strikes, riots,
civil commotions or labor disturbances, and any act of vandalism, malice,
sabotage, conversion, and theft. The policies shall also specify
that any losses shall be adjusted by the insurer with Secured Party
and Debtor.

     All insurance policies maintained by Debtor in accordance with
this section shall also comply with each of the following
requirements:

     (1)  be issued by insurers of recognized responsibility which
          are satisfactory to Secured Party;

     (2)  provide that if such insurance is canceled for any reason
          whatsoever, or any substantial change is made in policy
          terms, conditions or coverage, or the policy is allowed
          to lapse for nonpayment of premium, such cancellation,
          change or lapse shall not be effective as to Secured
          Party until thirty (30) days after Secured Party's
          receipt of written notice from Debtor's insurers of the
          cancellation, change or lapse in policy terms, conditions
          or coverage;

     (3)  provide that in respect of the interest of Secured Party
          in such policies, the insurance shall not be invalidated
          by any action or inaction of Debtor (or any "Permitted
          Lessee" as defined below in Section 11) and shall insure
          Secured Party regardless of any breach or violation by
          Debtor (or any Permitted Lessee) of any warranty,
          declaration or condition contained in such policies;

     (4)  be primary without right of contribution from any other
          insurance which is carried by Secured Party with respect
          to its interest in the Collateral;

     (5)  waive any right of subrogation against Secured Party;

     (6)  provide that Secured Party shall have no obligation or
          liability for premiums, commissions, assessments or calls
          in connection with such insurance policies.

     Debtor shall furnish to Secured Party evidence of the
aforesaid insurance coverage in certificate form. Evidence of
renewal of each policy shall thereafter be furnished to Secured
Party in certificate form. Debtor covenants that it will not do any
act or voluntarily suffer or permit any act to be done whereby any
insurance required hereunder shall or may be suspended, impaired or
defeated.

     6.   DEBTOR'S POSSESSION.  Debtor may have possession of
the Collateral and use it in any lawful manner not inconsistent
with this Agreement, except when an Event of Default has occurred
and is continuing. In the event Debtor fails to undertake any of
the following actions within five (5) days after receipt of Secured
Party's written demand for such action, Secured Party, at its
option and without assuming any obligation to do so, may discharge
taxes, liens, security interests or other


                                       3
<PAGE>

encumbrances levied or asserted against the Collateral, may place and 
pay for insurance thereon, may order and pay for the repair, maintenance 
and preservation thereof, and may pay any necessary filing or recording
fees.  Any amounts paid by Secured Party under the preceding
sentence shall be added to the unpaid principal balance under the
Promissory Note, shall be secured by the Collateral, and shall be
payable by Debtor upon demand by Secured Party together with
interest at the rate provided for in the Promissory Note until paid
in full.

     7.  DEBTOR'S COVENANTS.  As long as this Agreement
remains in effect, Debtor shall furnish Secured Party with such
information concerning the location, condition, and use of the
Collateral as Secured Party may reasonably request, and Debtor
shall permit any person(s) designated by Secured Party in writing
to inspect the Collateral, wherever located, and all records and
manuals maintained in connection therewith and to make copies of
such records, and to visit and inspect the properties and
facilities of Debtor, provided such visits do not unreasonably
interfere with the operations of Debtor, and to discuss the
affairs, finances and accounts of Debtor with the principal
financial officers of Debtor, all at such reasonable times and as
often as Secured Party may reasonably request. Secured Party shall
have no duty to make any such inspection and shall not incur any
liability or obligation or be deemed to have waived any right by
reason of not making any such inspection. Debtor shall also furnish
Secured Party with the following:

     (a)  within sixty (60) days after the end of each fiscal
          quarter of Debtor, a balance sheet, a profit and loss
          statement and a statement of cash flows as of the close
          of such quarter, prepared in accordance with established
          accounting principles generally accepted in the United
          States (hereafter "GAAP") applied on a basis consistent
          with the most recent audited. financial statements of
          Debtor, except for changes approved by Debtor's 
          independent auditors;

     (b)  as soon as available, but in any event not later than
          ninety (90) days after the close of each fiscal year of
          Debtor, an audited financial statement of Debtor (includ-
          ing a balance sheet, a profit and loss statement and a
          statement of cash flows) as of the close of such fiscal
          year, as examined and reported on by Debtor's independent
          public accountants in accordance with GAAP applied on a
          consistent basis as specified above in subsection (a);

     (c)  concurrently with the delivery of the financial state
          ments referred to in subsections (a) and (b) of this 
          Section 7, an Officer's Certificate stating that, to the 
          best of such officer's knowledge, Debtor during such period
          has observed and performed all of its covenants and other 
          agreements and satisfied every condition contained in this 
          Agreement to be observed, performed or satisfied by it and 
          that such officer has obtained no knowledge of any Event
          of Default except as specified in such certificate; and

     (d)  from time to time, such other information as Secured Party 
          may reasonably request with respect to the financial condition 
          and operations of Debtor in order to determine whether the 
          covenants, terms and provisions of this Agreement have been 
          complied with by Debtor.

                                       4
<PAGE>

     8.   DEBTOR'S DEFAULT.  The parties agree that the occurrence
of any of the following events shall constitute an "Event of
Default:"

     (a)  Debtor's failure to make any timely payment of either
          principal, interest, late payment charges or any other
          amount required to be paid under the New Promissory Note
          and this Security Agreement, or Debtor's failure to pay
          any amount required under the New Loan Agreement
          (including the Pledge Agreement, Initial Loans, and
          Airplane Leases as referenced and stated therein);

     (b)  Debtor's failure to perform any promise, agreement,
          obligation, warranty or covenant made by it herein, in
          the New Promissory Note or under the New Loan Agreement
          (including but not limited to the Pledge Agreement,
          Initial Loans, and Airplane Leases as referenced
          therein), if such default is not cured within five (5)
          days after Secured Party has given Debtor notice of such
          failure;

     (c)  Debtor's failure to maintain the insurance coverage as
          specified above in Section 5;

     (d)  any material misrepresentation made by Debtor to Secured
          Party in connection with the New Promissory Note, the New
          Loan Agreement or this Agreement;

     (e)  entry of a money judgment against Debtor, if such
          judgment is nonappealable and remains undischarged or
          unstayed for a period in excess of sixty (60) days;

     (f)  dissolution, termination of existence, insolvency,
          business failure, inability to pay debts that arise or
          accrue after the date of this Agreement as they mature,
          assignment for the benefit of creditors, or the commencement, 
          with respect to Debtor, of any proceedings (either voluntary 
          or involuntary) under any bankruptcy or insolvency laws;

     (g)  appointment of a receiver of any material part or all of
          Debtor's assets or the commencement of any involuntary
          proceedings against Debtor under any bankruptcy or
          insolvency laws, if such appointment or proceeding
          continues for a period of more than sixty (60) days;

     (h)  Debtor entering into any transaction, without the prior
          written consent of Secured Party, which consent will not
          be unreasonably withheld, whereby all or substantially
          all of Debtor's undertakings, property and assets would
          become the property of any other company, whether by way
          of reconstruction, reorganization, consolidation,
          amalgamation, merger, transfer, sale or otherwise;

     (i)  default in the payment by Debtor of any indebtedness for
          borrowed money owed to any creditor other than Secured
          Party resulting in the acceleration of a material amount
          of indebtedness greater than U.S. $5,000,000.00 that
          would reasonably justify Secured Party in deeming itself
          insecure;

                                       5
<PAGE>

     (j)  Debtor's ceasing to be licensed pursuant to U.S. or other
          applicable law to operate a commercial air service; or

     Should an Event of Default occur, Secured Party may employ all
remedies allowed by law, including declaring all indebtedness owed
under the New Promissory Note, as well as any other indebtedness or
liability of Debtor owed to Secured Party, immediately due and
payable. Additionally, Secured Party may require Debtor to assemble
the Collateral and make it available to Secured Party at a place to
be designated by Secured Party which is reasonably convenient to
both parties. The requirements of the Kansas Uniform Commercial
Code for reasonable notification to Debtor of the time and place of
any proposed public sale of the Collateral or of the time after
which any private sale or other intended disposition of the
Collateral is to be made shall be met if such notice is mailed,
postage prepaid, to Debtor's address, as specified herein, at least
ten (10) days before the time of the sale or disposition. After
deduction of all reasonable expenses incurred in realizing on this
security interest, and after the payment of all principal, interest
and late payment charges due under the New Promissory Note, the
balance of the proceeds of sale, if any, may be applied to the
payment of any or all other indebtedness which Debtor owes Secured
Party, regardless of whether such indebtedness is due or not.
Debtor shall be liable for any deficiency in its financial
obligation under the New Promissory Note, New Loan Agreement and
this Agreement after application of such proceeds. Debtor agrees to
pay the reasonable attorneys' fees incurred by Secured Party to
repossess the Collateral as well as the attorneys' fees incurred in
pursuing and collecting any deficiency. If, after a default by
Debtor, the Collateral is returned to or recovered by Secured
Party, Debtor agrees that Secured Party may move the Collateral for
purposes reasonably related to a proposed public or private sale or
other disposition of the Collateral.

     9.   WAIVERS.  No waiver of any covenant, warranty or condi
tion of this Agreement, nor of any breach or default hereunder,
shall be effective for any purpose whatsoever unless such waiver is
in writing and signed by an officer of Secured Party. It is
expressly agreed that Secured Party's waiver of any breach or
default by Debtor shall constitute a waiver only as to such
particular breach or default and not a waiver of any future breach
or default.

     10.  LIENS.  Debtor shall not, directly or indirectly,
create, incur, assume or suffer to exist any lien ("Lien") on or
with respect to the Collateral, or any part thereof, except:

     (a)  the Lien of Secured Party hereunder;

     (b)  Liens for taxes, assessments or other governmental
          charges owing by Debtor, either not yet due or being
          contested in good faith (and for the payment of which
          adequate reserves have been provided) and by appropriate
          proceedings so long as such proceedings do not involve
          any material danger of the sale, forfeiture or loss of
          the Collateral or any part thereof;

     (c)  materialmen's, mechanic's, workmen's, repairmen's,
          employees' Liens or any Lien of a similar nature arising
          in the ordinary course of Debtor's business, which Lien
          secures an obligation that is not yet delinquent or is
          being contested in good faith (and for the payment of 
          which adequate reserves have been provided) and by

<PAGE>

          appropriate proceedings so long as such proceedings do not involve 
          any material danger of the sale, forfeiture or loss of the Collateral 
          or any part thereof;

     (d)  Liens arising out of any judgment or award against Debtor, provided 
          that the judgment or award secured shall, within sixty (60) days of 
          entry thereof, have been discharged, vacated, reversed or execution 
          thereof stayed pending appeal and shall have been discharged, 
          vacated or reversed within sixty (60) days after the expiration of
          such stay; and

     (e)  any other Lien with respect to which Debtor shall have provided a 
          bond or other means that precludes the holder of the Lien, in the 
          reasonable judgment of Secured Party, from taking any recourse 
          against the Collateral.

Debtor shall promptly, at no expense to Secured Party, take (or cause to be 
taken) such action as may be necessary to duly discharge any Lien not 
excepted above if the same shall arise at any time with respect to the 
Collateral or any part thereof.

     14.  TAXES.   Debtor shall pay or cause to be paid in the manner and at 
the time required by applicable law, all federal, state and local taxes 
(including sales, property, use, value-added, goods and service taxes), 
assessments and governmental charges or levies imposed upon, or in respect 
of, the Collateral, this Agreement, any payments made hereunder or under the 
New Promissory Note, or upon or in respect of Debtor or Debtor's income or 
profits, or upon any property belonging to Debtor prior to the date on which 
penalties attach thereto and all lawful claims which, if not paid, become a 
Lien upon the property of Debtor (all of the above collectively "Taxes"). 
Debtor shall indemnify and hold Secured Party harmless from liability for the 
payment of any such Taxes.

     15.  LEGAL, VALID, BINDING AND ENFORCEABLE OBLIGATION. Debtor represents 
and warrants to Secured Party that this Agreement, upon execution and 
delivery, will constitute the legal, valid and binding obligation of Debtor 
and shall be enforceable in accordance with its terms. Debtor agrees to 
furnish Secured Party with written legal opinions, satisfactory in form and 
substance to Secured Party, verifying the aforesaid representation and 
warranty.

     16.  CHANGES OF ADDRESS AND CHANGE OF BASE.  Debtor shall immediately 
notify Secured Party in writing of any change of address from that shown in 
this Agreement.

     17.  GOVERNING LAW AND FORUM CHOICE. THIS AGREEMENT WAS MADE AND ENTERED 
INTO IN THE STATE OF KANSAS AND THE LAW GOVERNING THIS TRANSACTION SHALL BE 
THAT OF THE STATE OF KANSAS AS IT MAY FROM TIME TO TIME EXIST. THE LAW OF THE 
STATE OF KANSAS SHALL APPLY TO ANY AND ALL MATTERS ARISING FROM OR RELATED TO 
THIS AGREEMENT AND TRANSACTION INCLUDING ANY ACTIONS UNDERTAKEN BY SECURED 
PARTY SHOULD AN "EVENT OF DEFAULT" OCCUR. SUCH AS AN ACTION TO OBTAIN 
POSSESSION OF AND FORECLOSE UPON THE COLLATERAL, AND ALL OTHER REMEDIES WHICH 
MAY BE AVAILABLE INCLUDING SEEKING A DEFICIENCY JUDGMENT AGAINST DEBTOR. THE

                                       7
<PAGE>

PARTIES AGREE THAT ANY LEGAL PROCEEDING BASED UPON THE PROVISIONS OF THIS 
AGREEMENT SHALL BE BROUGHT EXCLUSIVELY IN EITHER THE UNITED STATES DISTRICT 
COURT FOR THE DISTRICT OF KANSAS AT WICHITA, KANSAS, OR IN THE EIGHTEENTH 
JUDICIAL DISTRICT COURT OF SEDGWICK COUNTY KANSAS TO THE EXCLUSION OF ALL 
OTHER COURTS AND TRIBUNALS. NOTWITHSTANDING THE ABOVE, IN THE EVENT AN "EVENT 
OF DEFAULT" SHOULD OCCUR SECURED PARTY (AT ITS SOLE OPTION) MAY INSTITUTE A 
LEGAL PROCEEDING IN ANY JURISDICTION AS MAY BE APPROPRIATE IN ORDER FOR 
SECURED PARTY TO OBTAIN POSSESSION OF AND FORECLOSE UPON THE COLLATERAL. THE 
PARTIES HEREBY CONSENT AND AGREE TO BE SUBJECT TO THE JURISDICTION OF THE 
AFORESAID COURTS IN SUCH PROCEEDINGS.

     18.  ENFORCEABILITY.  The provisions of this Agreement shall be 
severable and, if any provisions are for any reason determined to be invalid, 
void or unenforceable, in whole or in part, the remaining provisions shall 
remain in full force and effect; provided that the purpose of the remaining 
valid, effective and enforceable provisions is not frustrated; and provided 
further that no party is substantially and materially prejudiced thereby.

     19.  ASSIGNABILITY.  Secured Party shall have the absolute right to 
assign, transfer or sell any of its rights under this Agreement to any party 
of its choosing upon giving written notice thereof to Debtor. Debtor may not 
assign or delegate any of its rights or obligations hereunder without the 
prior written consent of Secured Party.

     20.  BINDING AGREEMENT.  All obligations of Debtor hereunder shall bind 
the heirs, legal representatives, successors and assigns of Debtor. If there 
be more than one Debtor hereunder, their liabilities shall be joint and 
several. All rights of Secured Party hereunder shall inure to the benefit of 
its successors and assigns.

     21.  MODIFICATION.  This Agreement shall not be changed orally, but only 
in writing signed by the parties hereto.

     22.  NOTICES.  Any notice pertaining to this Agreement shall be deemed 
sufficiently given if personally delivered or sent by registered or certified 
mail, return receipt requested, to the party to whom said notice is to be 
given, sent via telecopy with oral confirmation from a person at the 
receiving office that the transmission has been received, or sent overnight 
air carrier. Notices sent by registered or certified mail shall be deemed 
given on the third day after the date of postmark. Notices hand delivered 
shall be deemed given on the date delivered. Notices forwarded by telecopy 
shall be deemed given upon the foregoing oral confirmation that the 
transmission has been received. Notices sent overnight air carrier shall be 
deemed delivered the day after being forwarded. Until changed by written 
notice given by either party, the addresses of the parties shall be as 
follows:

                                       8
<PAGE>


          Debtor:             Great Lakes Aviation, Ltd.
                              Attn: Chairman
                              1965 - 330th Street
                              Spencer, IA 51301
                              Telephone: (712) 262-1000
                              Telecopy: (712) 262-1001

          Secured Party:      Raytheon Aircraft Credit Corporation
                              Attn: President
                              10511 East Central
                              Wichita, Kansas 67206
                              Telephone: (316) 676-8471
                              Telecopy: (316) 676-6975

     The designated addresses of both parties must be located within the 
United States of America allow for overnight air carrier delivery and be 
served by telecopy transmission service twenty-four (24) hours daily.

     23.  SIGNATORY AUTHORITY.   The undersigned officer of Debtor verifies 
and warrants that he/she has read this Agreement in its entirety, that he/she 
understands its provisions and purpose, and that he/she has full authority to 
sign and deliver the same on behalf of Debtor and to bind Debtor, as a 
corporation, thereto.

                                       9

<PAGE>

     In witness of the mutual promises, covenants and representa tions set 
forth herein, the parties have caused this Agreement to be duly executed and 
delivered at Wichita, Kansas, on the day and year first above written.

                              RAYTHEON AIRCRAFT CREDIT CORPORATION


                              By:   /s/ Daniel K. Smartt
                                    ----------------------------------
                                        Daniel K. Smartt
                                        "Secured Party"


                              GREAT LAKES AVIATION, LTD


                              By:   /s/ Douglas G. Voss
                                    ----------------------------------
                                        Douglas Voss, Chairman
                                             "Debtor"








                                       10
<PAGE>

STATE OF _____________   )
                         ) ss.
COUNTY OF ___________    )


     This instrument was acknowledged before me on the 11th day of July, 
1997, by Douglas Voss, who is the Chairman of Great Lakes Aviation, Ltd., on 
behalf of the corporation.

                                   ___________________________________
                                     Notary Public

                                   My Commission Expires:

                                   ___________________________________











                                       11
<PAGE>

                                    EXHIBIT A
                             INITIAL LOAN DOCUMENTS




<TABLE>
<CAPTION>

                                             CURRENT
                         TOTAL               MONTHLY            PAST DUE
SERIAL #                  DUE                PAYMENT             AMOUNT
- -----------        ----------------        -----------        ------------
<S>                <C>                     <C>                <C>
UC-159             $  2,322,230.95          $ 32,565.58       $194,409.42
UC-152                2,322,225.54            32,565.50        194,409.18
UC-101                2,512,033.72            32,736.58        161,720.26
UC-105                2,271,088.54            32,317.00        161,025.74
UC-126                2,757,713.83            36,123.49        179,904.05
UC-167                2,869,923.52            37,593.33        187,224.23
UC-174                2,815,971.61            36,886.61        183,704.57
UC-122                2,748,572.93            34,976.28        188,817.67
UC-125                2,757,713.83            36,123.49        179,904.05
UC-96                 2,344,545.19            30,241.23        150,539.07
UC-141                2,467,133.58            31,637.73        157,486.09
UC-138                2,451,700.76            31,623.38        157,419.34
UC-171                2,842,821.44            37,221.44        185,288.94
UC-145                2,428,710.14            30,966.60        154,140.74
UC-150                2,428,710.14            30,966.60        154,140.74
UC-168                2,876,773.98            37,665.98        187,501.88
UE-94                 3,442,799.22            37,207.85        185,112.73
UE-97                 3,442,799.22            37,207.85        185,112.73
UE-96                 3,451,339.89            37,211.89        179,621.98
UE-100                3,455,614.28            37,213.17        183,726.41
UE-101                3,470,333.01            37,201.66        189,212.63
UE-118                3,506,651.51            38,069.95        168,645.95
120-071               3,552,951.77            80,834.92        403,357.24
$5M Note              5,228,854.16                 0.00      5,228,854.16
                     -------------           ----------      ------------
                     70,769,212.76           847,158.11      9,501,279.80
                     -------------           ----------      ------------
</TABLE>



                                       12



<PAGE>
                                                                  EXHIBIT 10.5


Principal Sum:  U.S. $1,000,000.00
Due Date:  February 28, 1998
Done at Wichita, Kansas

                   NEGOTIABLE PROMISSORY NOTE

     On this 1st day of January, 1998, for good and valuable consideration, 
the receipt  and sufficiency of which is hereby acknowledged, GREAT LAKES 
AVIATION, LTD.,  Iowa corporation, with its principal place of business at 
1965 - 330th Street, Spencer, Iowa 51201 (hereinafter "Debtor"), 
unconditionally promises to pay to the order of RAYTHEON AIRCRAFT CREDIT 
CORPORATION (hereinafter "Secured Party") or its assigns, the sum of One 
Million and 00/100 United States Dollars (U.S. $1,000,000.00) (hereinafter 
"Principal Sum"), together with accrued interest at the applicable Interest 
Rate specified below and such other charges and fees as herein provided.  
This Negotiable Promissory Note is sometimes hereinafter referred to as the 
"New Promissory Note No. 4" or the "Agreement."

     For such purposes as hereinafter specified, the "Commencement Date" of 
this New Promissory Note No. 4 shall be January lst, 1998. The period of time 
from the "Commencement Date" through the "Due Date" is herein referred to as 
the "Financing Term."  The Principal Sum and accrued interest shall be repaid 
by Debtor to Secured Party in one payment on demand or no later than February 
28, 1998, hereinafter "Due Date," in accordance with the terms and subject to 
the conditions specified below:

     1.   INTEREST RATE.  In addition to Debtor's repayment of the Principal 
Sum, Debtor shall pay interest to Secured Party on the unpaid balance of the 
Principal Sum at the applicable rate of interest hereinafter specified.  
Debtor's payment of accrued interest shall be made in conjunction with its 
payment of principal as specified below in Section 2.  The applicable rate of 
interest throughout the Financing Term shall be eight point five percent 
(8.5%) per annum.  All interest shall be calculated on the basis of a 360-day 
year and actual days outstanding.

     2.   PAYMENT OF PRINCIPAL AND INTEREST.  The Principal Sum shall be 
repaid by Debtor to Secured Party, together with accrued interest at the 
applicable Interest Rate specified above in Section 1, in one payment due on 
demand or no later than February 28, 1998.

     3.   REPAYMENT AND PREPAYMENT.  The aforesaid payment of principal and 
interest shall be made to Secured Party at its office in Wichita, Kansas from 
 Debtor's settlement amounts payable to Debtor by Airlines Clearing House, 
Inc. or The Chase Manhattan Bank, N.A., Agent for Airlines Clearing House, 
Inc.  Debtor's payment hereunder, when received, shall be applied first to 
the payment of accrued and unpaid interest (computed upon the

<PAGE>

unpaid balance of the Principal Sum) and any late payment charges owed as of 
the date such payment is received by Secured Party (if any), and the 
remainder of Debtor's payment shall be applied to payment of the unpaid 
Principal Sum.  The unpaid Principal Sum and all accrued interest must be 
paid in full on the Due Date.  Debtor may prepay the unpaid balance of the 
Principal Sum in part or in full at any time and without any penalty.

     4.   LATE PAYMENT CHARGE.  In the event Debtor is late in making the 
payment due hereunder as specified above, a late payment charge in an amount 
equal to one and one-half percent (1 1/2%) of the amount of the delayed 
payment shall be assessed against Debtor and added to the amount of the 
delayed payment due hereunder for the purpose of defraying Secured Party's 
expenses incident to handling the delinquent payment.  Any late payment 
charge assessed against Debtor shall be immediately due and payable to 
Secured Party.  The late payment charge shall be in addition to, and not in 
lieu of, any other remedy provided to Secured Party in this Agreement for 
default by Debtor.

     5.   SECURED TRANSACTION.  To secure the payment of Debtor's obligation 
hereunder and any and all other indebtedness owed by Debtor to Secured Party 
(whether now existing or hereafter arising), as well as any renewals, 
extensions or changes in the form of said obligation or indebtedness, Debtor 
executed a Pledge and Assignment Agreement dated July 11, 1997, and Debtor 
executed a Security Agreement and Encumbrance Against Air Carrier Aircraft 
Engines, Propellers, Appliances and Spare Parts (hereinafter "Security 
Agreement") dated August 21, 1997.  All of the foregoing is collectively 
referred to as the "Collateral."

     6.   PURPOSE OF LOAN.  Debtor warrants and represents to Secured Party 
that this loan is for business, commercial or agricultural purposes and not 
primarily for personal, family or household purposes.

     7.   DEBTOR'S DEFAULT.  The parties agree that Debtor's failure to pay 
this New Promissory Note No. 4 on or before the earlier of demand or the Due 
Date shall constitute an "Event of Default."  Should an Event of Default 
occur, Secured Party may employ all remedies allowed by law, including 
declaring all indebtedness or liability of Debtor under this New Promissory 
Note No. 4 or otherwise owed to Secured Party, immediately due and payable.  
After the payment of all principal, interest and late payment charges due 
under this Agreement, the balance of the proceeds of the Collateral, if any, 
may be applied to the payment of any or all other indebtedness which Debtor 
owes Secured Party, regardless of whether such indebtedness is due or not.  
Debtor shall be liable for any deficiency in its financial obligation under 
this Agreement after application of such proceeds.  Debtor agrees to pay the 
reasonable attorneys' fees incurred by Secured Party.

     8.   OBLIGATION TO MAKE PAYMENTS.  Debtor acknowledges and agrees that 
its obligation to make the payment due and owing under the provisions hereof 
shall be absolute and unconditional and to the extent permitted by applicable 
law shall not be affected by any circumstance whatsoever, including, without 
limitation (a) any setoff, counterclaim, defense or other right which Debtor 
may have against Secured Party or any other person or entity for any reason 
whatsoever; (b) any liens or rights of others with respect to the Collateral; 
(c) the

                                       2
<PAGE>

invalidity or unenforceability or lack of due authorization of this Agreement 
or any lack of right, power or authority of Debtor or Secured Party to enter 
into this Agreement; (d) any insolvency, bankruptcy, reorganization or 
similar proceedings by or against Debtor or any other person or entity; or 
(e) any other cause whether similar or dissimilar to the foregoing, any 
present or future law notwithstanding, it being the intention of the parties 
hereto that  the payment being payable by Debtor hereunder shall continue to 
be payable in all events in the manner and at the time provided herein.  Such 
payment shall not be subject to any abatement, setoff or reduction for any 
reason whatsoever, including any present or future claims by Debtor against 
Secured Party under this Agreement tor otherwise.  To the extent permitted by 
applicable law, Debtor hereby waives any rights which it may now have or 
which may be conferred upon it, by statute or otherwise, to terminate, 
cancel, quit or surrender this Agreement except in accordance with the terms 
hereof.

     9.   WAIVERS.  Debtor hereby waives any requirements pertaining to 
presentment, notice of dishonor, and all other notices or demands in 
connection with the delivery, acceptance, performance or default of this New 
Promissory Note No. 4.  No waiver of any covenant, warranty or condition of 
this Agreement nor of any breach or default hereunder, shall be effective for 
any purpose whatsoever unless such waiver is in writing and signed by an 
officer of Secured Party.  It is expressly agreed that Secured Party's waiver 
of any breach or default by Debtor shall constitute a waiver only as to such 
particular beech or default and not a waiver only as to such particular 
breach or default and not a waiver of any future breach or default.

     10.  LEGAL, VALID, BINDING AND ENFORCEABLE OBLIGATION.  Debtor 
represents and warrants to Secured Party that this New Promissory Note No. 4, 
upon execution and delivery, will constitute the legal, valid and binding 
obligation of Debtor and shall be enforceable in accordance with its terms.  
Debtor agrees to furnish Secured Party with written legal opinions, 
satisfactory in form and substance to Secured Party, verifying the aforesaid 
representation and warranty.

     11.  CHANGES OF ADDRESS.  Debtor shall immediately notify Secured Party 
in writing of any change of address from that shown in this Agreement.

     12.  GOVERNING LAW AND FORUM CHOICE.  THIS AGREEMENT WAS MADE AND 
ENTERED INTO IN THE STATE OF KANSAS AND THE LAW GOVERNING THIS TRANSACTION 
SHALL BE THAT OF THE STATE OF KANSAS AS IT MAY FROM TIME TO TIME EXIST.  THE 
LAW OF THE STATE OF KANSAS SHALL APPLY TO ANY AND ALL MATTERS ARISING FROM OR 
RELATED TO THIS AGREEMENT AND TRANSACTION, INCLUDING ANY ACTIONS UNDERTAKEN 
BY SECURED PARTY SHOULD AN "EVENT OF DEFAULT" OCCUR, SUCH AS AN ACTION TO 
OBTAIN POSSESSION OF  AND FORECLOSE UPON THE COLLATERAL, AND ALL OTHER 
REMEDIES WHICH MAY BE AVAILABLE INCLUDING SEEKING A DEFICIENCY JUDGMENT 
AGAINST DEBTOR.  THE PARTIES AGREE THAT ANY LEGAL PROCEEDING BASED UPON THE 
PROVISIONS OF THIS AGREEMENT SHALL BE BROUGHT EXCLUSIVELY

                                       3
<PAGE>

IN EITHER THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF KANSAS AT 
WICHITA, KANSAS, OR IN THE EIGHTEENTH JUDICIAL DISTRICT COURT OF SEDGWICK 
COUNTY, KANSAS, TO THE EXCLUSION OF ALL OTHER COURTS AND TRIBUNALS.  
NOTWITHSTANDING THE ABOVE, IN THE EVENT AN "EVENT OF DEFAULT" SHOULD OCCUR, 
SECURED PARTY (AT ITS SOLE OPTION) MAY INSTITUTE A LEGAL PROCEEDING IN ANY 
JURISDICTION AS MAY BE APPROPRIATE IN ORDER FOR SECURED PARTY TO OBTAIN 
POSSESSION OF AND FORECLOSE UPON THE COLLATERAL.  THE PARTIES HEREBY CONSENT 
AND AGREE TO BE SUBJECT TO THE JURISDICTION OF THE AFORESAID COURTS IN SUCH 
PROCEEDINGS.

     13.  ENFORCEABILITY.  The provisions of this Agreement shall be 
severable and, if any provisions are for any reason determined to be invalid, 
void or unenforceable, in whole or in part, the remaining provisions shall 
remain in full force and effect; provided that the purpose of the remaining 
valid, effective and enforceable provisions is not frustrated; and provided 
further that no party is substantially and materially prejudiced thereby.

     14.  ASSIGNABILITY.  Secured Party shall have the  absolute right to 
assign, transfer or sell any of its rights under this New Promissory Note No. 
4 to any party of its choosing upon giving written notice thereof to Debtor.  
Debtor may not assign or delegate any of its rights or obligations hereunder 
without the prior written consent of Secured Party.

     15.  BINDING AGREEMENT.  All obligations of Debtor hereunder shall bind 
the heirs, legal representatives, successors and assigns of Debtor.  If there 
be more than one Debtor hereunder, their liabilities shall be joint and 
several.  All rights of Secured Party hereunder shall inure to the benefit of 
it successors and assigns.

     16.  MODIFICATION.  This Agreement shall not be changed orally, but only 
in writing signed by the parties hereto.

     17.  NOTICES.  Any notice pertaining to this Agreement shall be deemed 
sufficiently given if personally delivered or sent by registered or certified 
mail, return receipt requested, to the party to whom said notice is to be 
given, or sent via telecopy with oral confirmation from a person at the 
receiving office that the transmission has been received.  Notices sent by 
registered or certified mail shall be deemed given on the third day after the 
date of postmark.  Notices hand delivered shall be deemed given on the date 
delivered.  Notices forwarded by telecopy shall be deemed given upon the 
foregoing oral confirmation that the transmission has been required.  Notices 
sent overnight carrier shall be deemed delivered the day after being 
forwarded.  Until changed by written notice given by either party, the 
addresses of the parties shall be as follows:

               Debtor:          Great Lakes Aviation, Ltd.
                                Attn:  Chairman
                                1965 - 330th Street
                                Spencer, Iowa  51301






                                       4
<PAGE>
                                Telephone:     (712) 262-1000
                                Telefax:       (712) 262-1001

               Secured Party:   Raytheon Aircraft Credit Corporation
                                Attn:  President
                                10511 East Central
                                Wichita, Kansas  67206
                                Telephone:(316) 676-8471
                                Telefax:  (316) 676-6975

The designated addresses of both parties must be located within the United 
States of America and allow for overnight air carrier delivery and served by 
telecopy transmission service twenty-four (24) hours daily.

     18.  SIGNATORY AUTHORITY.  The undersigned officer of Debtor verifies 
and warrants that he/she has read this New Promissory Note No. 4 in is 
entirety, that he/she understands its provisions and purpose, and that he/she 
has full authority to sign and deliver the same on behalf of Debtor and to 
bind Debtor, as a corporation, thereto.

     In witness of the foregoing, Debtor has caused its duly authorized 
officer to execute and deliver this Agreement at Wichita, Kansas on the day 
and year herein stated.

                                   GREAT LAKES AVIATION, LTD.


                              By:     /s/ Douglas G. Voss
                                   ----------------------------------
                                   Douglas G. Voss
                                   Chairman
                                             "Debtor"


                                      5

<PAGE>


STATE OF IOWA       )
                    ) ss:
COUNTY OF CLAY      )


     This instrument was acknowledged before me on the _____ day of January, 
1998, by Douglas G. Voss, who is the Chairman of Great Lakes Aviation, Ltd., 
on behalf of the corporation.

                                  -----------------------------------
                                  Notary Public


                                  My Commission Expires:


                                  -----------------------------------



                                      6




<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                               0
<SECURITIES>                                      1124
<RECEIVABLES>                                     6488
<ALLOWANCES>                                         0
<INVENTORY>                                      11660
<CURRENT-ASSETS>                                 20130
<PP&E>                                           51034
<DEPRECIATION>                                 (10034)
<TOTAL-ASSETS>                                   62746
<CURRENT-LIABILITIES>                            29616
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            76
<OTHER-SE>                                      (2827)
<TOTAL-LIABILITY-AND-EQUITY>                     62746
<SALES>                                              0
<TOTAL-REVENUES>                                 18861
<CGS>                                                0
<TOTAL-COSTS>                                    21882
<OTHER-EXPENSES>                                   857
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 857
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             (3878)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    (3878)
<EPS-PRIMARY>                                    (.51)
<EPS-DILUTED>                                    (.51)
        

</TABLE>


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