1 EXHIBIT 10.1 Supplemental Agreement No. 8 to Purchase Agreement No. 1810 between The Boeing Company and SOUTHWEST AIRLINES CO. Relating to Boeing Model 737-7H4 Aircraft THIS SUPPLEMENTAL AGREEMENT, entered into as of March 20, 1999, by and between THE BOEING COMPANY, a Delaware corporation with its principal offices in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas corporation with its principal offices in City of Dallas, State of Texas (Buyer); WHEREAS, the parties hereto entered into Purchase Agreement No. 1810 dated January 19, 1994, relating to Boeing Model 737-7H4 aircraft (the Agreement) and; WHEREAS, Buyer has agreed to exercise the option to purchase six (6) additional Option Aircraft and to accelerate delivery of those Option Aircraft from July 2006 (2) and October 2006 four (4) to June 2000 three (3), July 2000 one (1) and August 2000 two (2); NOW THEREFORE, in consideration of the mutual covenants herein contained, the parties agree to amend the Agreement as follows: - -------------------------------------------------------------------------------- *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 SA-8-1 K/SWA 2 1. The Table of Contents of the Agreement is deleted in its entirety and a new Table of Contents is attached hereto and incorporated into the Agreement by this reference. 2. Article 1, entitled "Subject Matter of Sale," paragraph 1.1 entitled "The Aircraft" is deleted in its entirety and replaced by a new paragraph 1.1 revised to reflect one hundred thirty-six (136) Aircraft. Such new page 1-1 is attached hereto and incorporated into the Agreement by this reference. 3. Article 2, entitled "Delivery, Title and Risk of Loss," paragraph 2.1, entitled "Time of Delivery," is deleted in its entirety and replaced by a new paragraph 2.1 revised to add three (3) Block "L" Aircraft for delivery in June 2000, to add one (1) Block "L" Aircraft for delivery in July 2000 and to add two (2) Block "L" Aircraft for delivery in August 2000. Such new pages 2-1, 2-2 and 2-3 are attached hereto and incorporated into the Agreement by this reference. 4. Article 3, entitled "Price of Aircraft", paragraph 3.4 entitled "Advance Payment Base Price," subparagraph 3.4.1 entitled "Advance Payment Base Price" is revised by adding Advance Payment Base Prices for the Block "L" June 2000, July 2000 and August 2000 Aircraft. Such new pages 3-1, 3-2, 3-3 and 3-4 are attached hereto and incorporated into the Agreement by this reference. 5. Letter Agreement No. 6-1162-RLL-933R6 entitled "Option Aircraft" is deleted in its entirety and replaced with Letter Agreement No. 6-1162-RLL-933R7 attached hereto and incorporated herein by this reference. The third paragraph is revised to refer to fifty-two (52) Rollover Option Aircraft. Article 2 entitled "Delivery of Rollover Option Aircraft," paragraph 2.1 is revised to change the quantity of Rollover Option Aircraft from eighteen (18) to twelve (12) in the year 2009; paragraph 2.2 and subparagraphs 2.2.1 and 2.2.2 are revised by changing the quantity of Rollover Option Aircraft from fifty-eight (58) to fifty-two (52). P.A. No. 1810 SA-8-2 K/SWA 3 6. All references in the Letter Agreements associated with Purchase Agreement No. 1810 shall be deemed to refer to the purchase by Buyer of one hundred thirty-six (136) Model 737-7H4 Aircraft, sixty-two (62) Model 737-7H4 Option Aircraft and fifty-two (52) Model 737-7H4 Rollover Option Aircraft, to the extent such reference is not specifically addressed herein. 7. Concurrent with execution of this Supplemental Agreement, Buyer will pay to Boeing ***. Such amount reflects the difference in advance payments due as a result of the exercise of the Option to purchase six Aircraft and the deposits due for six Rollover Option Aircraft converted to Option Aircraft. The Agreement will be deemed to be supplemented to the extent herein provided and as so supplemented will continue in full force and effect. EXECUTED IN DUPLICATE as of the day and year first above written. THE BOEING COMPANY SOUTHWEST AIRLINES CO. By: /s/ DAWN S. FOSTER By: /s/ LAURA WRIGHT ------------------------ --------------------- Its: ATTORNEY-IN-FACT Its: TREASURER ----------------------- -------------------- P.A. No. 1810 SA-8-3 K/SWA 4 PURCHASE AGREEMENT between THE BOEING COMPANY and SOUTHWEST AIRLINES CO. Relating to Boeing Model 737-7H4 Aircraft Purchase Agreement Number 1810 *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 i K/SWA SA-8 5 TABLE OF CONTENTS Page SA Number Number ------ ------ ARTICLES - -------- 1. Subject Matter of Sale..........................................1-1 SA-8 2. Delivery, Title and Risk of Loss.........................................................2-1 SA-8 3. Price of Aircraft...............................................3-1 SA-8 4. Taxes...........................................................4-1 5. Payment.........................................................5-1 6. Excusable Delay.................................................6-1 7. Changes to the Detail Specification...................................................7-1 SA-1 8. Federal Aviation Requirements and Certificates and Export License.................................8-1 9. Representatives, Inspection, Flights and Test Data...........................................9-1 10. Assignment, Resale or Lease....................................10-1 11. Termination for Certain Events.................................11-1 12. Product Assurance; Disclaimer and Release; Exclusion of Liabilities; Customer Support; Indemnification and Insurance..................................................12-1 13. Buyer Furnished Equipment and Spare Parts....................................................13-1 14. Contractual Notices and Requests...............................14-1 15. Miscellaneous..................................................15-1 P.A. No. 1810 ii K/SWA SA-8 6 TABLE OF CONTENTS SA Number ------ EXHIBITS - -------- A Aircraft Configuration SA-1 B Product Assurance Document SA-1 C Customer Support Document D Price Adjustments Due to Economic Fluctuations - Aircraft E Buyer Furnished Equipment Provisions Document F Defined Terms Document LETTER AGREEMENTS - ----------------- 1810-1 Waiver of Aircraft Demonstration Flight P.A. No. 1810 iii K/SWA SA-8 7 TABLE OF CONTENTS SA Number ------ RESTRICTED LETTER AGREEMENTS - ---------------------------- 6-1162-RLL-932 Promotional Support 6-1162-RLL-933R7 Option Aircraft SA-8 6-1162-RLL-934R1 Disclosure of Confidential SA-1 Information 6-1162-RLL-935R1 Performance Guarantees SA-1 6-1162-RLL-936R4 Certain Contractual Matters SA-4 6-1162-RLL-937 Alternate Advance Payment Schedule 6-1162-RLL-938 *** 6-1162-RLL-939R1 Certification Flight Test Aircraft SA-1 6-1162-RLL-940R1 Training Matters SA-1 6-1162-RLL-941R1 Other Matters SA-1 6-1162-RLL-942 Open Configuration Matters 6-1162-RLL-943R1 Substitution Rights SA-6 6-1162-RLL-944 Airframe Maintenance Material Cost Protection Program 6-1162-RLL-945 Comparison of 737-7H4 and 737-3H4 Block Fuel Burn 6-1162-RLL-1855R3 Additional Contractual Matters SA-4 6-1162-RLL-1856 *** SA-1 6-1162-RLL-1857 Service Ready Validation Program SA-1 Field Test 6-1162-RLL-1858R1 Escalation Matters SA-4 P.A. No. 1810 iv K/SWA SA-8 8 TABLE OF CONTENTS CON'T SA Number ------ RESTRICTED LETTER AGREEMENTS - ---------------------------- 6-1162-RLL-2036 Amortization of Costs for Customer Unique Changes SA-1 6-1162-RLL-2037 Reconciliation of the Aircraft SA-1 Basic Price 6-1162-RLL-2073 Maintenance Training Matters SA-1 P.A. No. 1810 v K/SWA SA-8 9 PURCHASE AGREEMENT NO. 1810 Relating to BOEING MODEL 737-7H4 AIRCRAFT -------------------------- This Agreement is entered into as of January 19th 1994, by and between The Boeing Company, a Delaware corporation, with its principal office in Seattle, Washington (Boeing), and Southwest Airlines Co., a Texas corporation, with its principal office in the City of Dallas, State of Texas (Buyer). Accordingly, Boeing and Buyer agree as follows: P.A. No. 1810 1-1 K/SWA SA-8 10 ARTICLE 1. Subject Matter of Sale. 1.1 The Aircraft. Subject to the terms and conditions of this Agreement, Boeing will manufacture and deliver to Buyer and Buyer will purchase and accept delivery from Boeing of one hundred thirty-six (136) Boeing Model 737-7H4 aircraft (the Aircraft) manufactured in accordance with Boeing Detail Specification D6-38808-1, dated October 30, 1996, as described in Exhibit A, as modified from time to time in accordance with this Agreement (Detail Specification). 1.2 Additional Goods and Services. In connection with the sale of the Aircraft, Boeing will also provide to Buyer certain other things under this Agreement, including data, documents, training and services, all as described in this Agreement. 1.3 Performance Guarantees. Any performance guarantees applicable to the Aircraft will be expressly included in this Agreement. Where performance guarantees are included in this Agreement other than within the Detail Specification, such guarantees will be treated as being incorporated in the Detail Specification by this reference. 1.4 Defined Terms. For ease of use, certain terms are treated as defined terms in this Agreement. Such terms are identified with a capital letter and set forth and/or defined in Exhibit F. P.A. No. 1810 1-2 K/SWA 11 ARTICLE 2. Delivery, Title and Risk of Loss. 2.1 Time of Delivery. The Aircraft will be delivered to Buyer by Boeing, assembled and ready for flight and Buyer will accept delivery of the Aircraft, in accordance with the following schedule: Month and Year of Delivery Quantity of Aircraft -------------- -------------------- Block A Aircraft ---------------- October 1997 Two (2) November 1997 Two (2) Block B Aircraft ---------------- January 1998 Two (2) February 1998 Three (3) March 1998 Two (2) April 1998 Two (2) May 1998 Two (2) June 1998 One (1) July 1998 Two (2) September 1998 Two (2) Block C Aircraft ---------------- February 1999 Four (4) May 1999 Four (4) July 1999 Four (4) August 1999 One (1) September 1999 Three (3) Block D Aircraft ---------------- November 1999 Two (2) December 1999 One (1) January 2000 One (1) March 2000 Four (4) July 2000 Four (4) September 2000 Three (3) Block E Aircraft ---------------- January 2001 Three (3) March 2001 Three (3) July 2001 Three (3) September 2001 Three (3) P.A. No. 1810 15-1 K/SWA 12 Block F Aircraft ---------------- October 1998 One (1) November 1998 Two (2) December 1998 Two (2) Block G Aircraft ---------------- March 1999 Two (2) Block H Aircraft ---------------- June 1999 Two (2) July 1999 One (1) August 1999 One (1) September 1999 Two (2) October 1999 One (1) April 2000 Three (3) October 2000 Three (3) April 2001 Three (3) October 2001 Three (3) Block I Aircraft ---------------- January 2002 Four (4) March 2002 Four (4) April 2002 Two (2) July 2002 Four (4) October 2002 Four (4) Block J Aircraft ---------------- January 2003 Four (4) March 2003 One (1) Block K Aircraft ---------------- April 2004 Two (2) July 2004 Three (3) P.A. No. 1810 15-2 K/SWA 13 Block L Aircraft ---------------- October 1999 One (1) November 1999 Two (2) December 1999 One (1) June 2000 Three (3) July 2000 One (1) August 2000 Two (2) November 2000 Two (2) December 2000 One (1) July 2001 One (1) September 2001 One (1) October 2001 One (1) September 2002 Three (3) 2.2 Notice of Target Delivery Date. Boeing will give Buyer notice of the Target Delivery Date of the Aircraft approximately 30 days prior to the scheduled month of delivery. 2.3 Notice of Delivery Date. If Boeing gives Buyer at least 7 days' notice of the delivery date of the Aircraft, and an Aircraft delivery is delayed beyond such delivery date due to the responsibility of Buyer, Buyer will reimburse Boeing for all costs incurred by Boeing as a result of such delay, including amounts for storage, insurance, Taxes, preservation or protection of the Aircraft and interest on payments due. 2.4 Place of Delivery. The Aircraft will be delivered at an airport facility selected by Boeing in the State of Washington, unless mutually agreed otherwise. 2.5 Title and Risk of Loss. Title to and risk of loss of an Aircraft will pass from Boeing to Buyer upon delivery of such Aircraft, but not prior thereto. 2.6 Bill of Sale. Upon delivery of an Aircraft Boeing will deliver to Buyer a bill of sale conveying good title to such Aircraft, free of all liens, claims, charges and encumbrances of every kind whatsoever, and such other appropriate documents of title as Buyer may reasonably request. P.A. No. 1810 15-3 K/SWA 14 ARTICLE 3. Price of Aircraft. 3.1 Definitions. 3.1.1 Special Features are the features incorporated in Exhibit A which have been selected by Buyer. 3.1.2 Base Aircraft Price is the Aircraft Basic Price excluding the price of Special Features. 3.1.3 Aircraft Basic Price is comprised of the Base Aircraft Price and the price of the Special Features. 3.1.4 Economic Price Adjustment is the adjustment to the Aircraft Basic Price (Base Aircraft and Special Features) as calculated pursuant to Exhibit D. 3.1.5 Aircraft Price is the total amount Buyer is to pay for the Aircraft at the time of delivery. 3.2 Aircraft Basic Price ***. The Aircraft Basic Price, expressed in July 1992 dollars, is set forth below: Base Special Aircraft Aircraft Price Features Basic Price Block A, B, C, D & E Aircraft *** *** *** Block F & G Aircraft *** *** *** Block H Aircraft *** *** *** Block I Aircraft *** *** *** Block J Aircraft *** *** *** Block K Aircraft *** *** *** Block L Aircraft *** *** *** 3.3 Aircraft Price. The Aircraft Price will be established at the time of delivery of such Aircraft to Buyer and will be the sum of: 3.3.1 the Aircraft Basic Price, which is *** for the Block A, B, C, D and E Aircraft, *** for the Block F and G Aircraft, *** for the Block H Aircraft, *** for the P.A. No. 1810 15-4 K/SWA 15 Block I Aircraft, *** for the Block J Aircraft, *** for the Block K Aircraft and *** for the Block L Aircraft; plus 3.3.2 the Economic Price Adjustments for the Aircraft Basic Price, as calculated pursuant to the formulas set forth in Exhibit D (Price Adjustments Due to Economic Fluctuations - Aircraft); plus 3.3.3 other price adjustments made pursuant to this Agreement or other written agreements executed by Boeing and Buyer. 3.4 Advance Payment Base Price. 3.4.1 Advance Payment Base Price. For advance payment purposes, the following estimated delivery prices of the Aircraft (Advance Payment Base Price) have been established, using currently available forecasts of the escalation factors used by Boeing as of the date of signing this Agreement. The Advance Payment Base Price of each Aircraft is set forth below: Month and Year of Advance Payment Base Scheduled Delivery Price per Aircraft ------------------ -------------------- Block A Aircraft *** ---------------- October 1997 *** November 1997 *** Block B Aircraft *** ---------------- January 1998 *** February 1998 *** March 1998 *** April 1998 *** May 1998 *** June 1998 *** July 1998 *** September 1998 *** Block C Aircraft *** ---------------- February 1999 *** May 1999 *** July 1999 *** August 1999 *** September 1999 *** P.A. No. 1810 15-5 K/SWA 16 Block D Aircraft *** ---------------- November 1999 *** December 1999 *** January 2000 *** March 2000 *** July 2000 *** September 2000 *** Block E Aircraft *** ---------------- January 2001 *** March 2001 *** July 2001 *** September 2001 *** Block F Aircraft *** ---------------- October 1998 *** November 1998 *** December 1998 *** Block G Aircraft *** ---------------- March 1999 *** Block H Aircraft *** ---------------- June 1999 *** July 1999 *** August 1999 *** September 1999 *** October 1999 *** April 2000 *** October 2000 *** April 2001 *** October 2001 *** Block I Aircraft *** ---------------- January 2002 *** March 2002 *** April 2002 *** July 2002 *** October 2002 *** Block J Aircraft *** ---------------- January 2003 *** March 2003 *** P.A. No. 1810 15-6 K/SWA 17 Block K Aircraft *** -------------------- April 2004 *** July 2004 *** Block L Aircraft *** -------------------- October 1999 *** November 1999 *** December 1999 *** June 2000 *** July 2000 *** August 2000 *** November 2000 *** December 2000 *** July 2001 *** September 2001 *** October 2001 *** September 2002 *** 3.4.2 Adjustment of Advance Payment Base Prices - Long-Lead Aircraft. For Aircraft scheduled for delivery 36 months or more after the date of this Agreement, the Advance Payment Base Prices appearing in Article 3.4.1 will be used to determine the amount of the first advance payment to be made by Buyer on the Aircraft. No later than 25 months before the scheduled month of delivery of each affected Aircraft, Boeing will increase or decrease the Advance Payment Base Price of such Aircraft as required to reflect the effects of (i) any adjustments in the Aircraft Basic Price pursuant to this Agreement and (ii) the then-current forecasted escalation factors used by Boeing. Boeing will provide the adjusted Advance Payment Base Prices for each affected Aircraft to Buyer, and the advance payment schedule will be considered amended to substitute such adjusted Advance Payment Base Prices. P.A. No. 1810 15-7 K/SWA 18 6-1162-RLL-933R7 Southwest Airlines Co. P.O. Box 36611 - Love Field Dallas, Texas 75235 Subject: Letter Agreement No. 6-1162-RLL-933R7 to Purchase Agreement No. 1810 - Option Aircraft This Letter Agreement amends Purchase Agreement No. 1810 dated as of January 19, 1994 (the Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 aircraft (Aircraft). All terms used and not defined herein will have the same meaning as in the Agreement. In consideration of the purchase by Buyer of the Aircraft, Boeing hereby agrees to manufacture and sell to Buyer sixty-two (62) additional Model 737-7H4 aircraft as described in paragraph 1 of Attachment A hereto (Option Aircraft) and fifty-two (52) Model 737-7H4 Rollover Option Aircraft (Rollover Option Aircraft), subject to the terms and conditions set forth below. 1. Delivery of Option Aircraft. The Option Aircraft will be delivered to Buyer during or before the months set forth in the following schedule: - -------------------------------------------------------------------------------- *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 K/SWA SA-8 19 Southwest Airlines Co. 6-1162-RLL-933R7 Page 2 Number of Option Month and Year Option Aircraft of Delivery Aircraft Block -------------- -------- -------- March 2003 Three (3) M April 2003 Two (2) M July 2003 Four (4) M October 2003 Four (4) M January 2004 Four (4) N March 2004 One (1) N April 2004 One (1) N August 2004 Two (2) N September 2004 Three (3) N October 2004 Two (2) N Number of Option Month and Year Option Aircraft of Delivery Aircraft Block -------------- -------- ------ January 2005 Four (4) O March 2005 Four (4) O April 2005 Two (2) O July 2005 Four (4) O October 2005 Four (4) O January 2006 Four (4) P March 2006 Four (4) P April 2006 Two (2) P July 2006 Four (4) P October 2006 Four (4) P 2. Delivery of Rollover Option Aircraft. 2.1 The Rollover Option Aircraft will be delivered to Buyer during or before the years set forth in the following schedule: Option Year of Number of Aircraft Delivery Option Aircraft Block -------- --------------- -------- 2007 Twenty (20) Q 2008 Twenty (20) R 2009 Twelve (12) S 2.2 The fifty-two (52) Rollover Option Aircraft are offered to Buyer subject to the following conditions: P.A. No. 1810 K/SWA SA-8 20 Southwest Airlines Co. 6-1162-RLL-933R7 Page 3 2.2.1 Buyer can exercise any fifty-two (52) of the sixty-two (62) Option Aircraft, and will be offered a Rollover Option Aircraft for each option aircraft exercised up to and including fifty-two (52). 2.2.2 Conversely to Article 2.2.1 above, if Buyer does not exercise a minimum of fifty-two (52) Option Aircraft, one Rollover Option Aircraft will be deleted for each Option Aircraft not exercised by Buyer. 2.2.3 When Buyer exercises one or more Option Aircraft, Boeing will offer the same quantity of Rollover Option Aircraft to Buyer in the years identified in Article 2.1 above. 2.2.4 The Rollover Option Aircraft delivery month offered by Boeing to Buyer will be at least 24 months from the Option exercise date of the corresponding option. 2.2.5 When Boeing offers the Rollover Option Aircraft to Buyer, Buyer will accept such Rollover Option Aircraft by wire transferring $100,000 to Boeing. In the event Buyer exercises its option to purchase the Rollover Option Aircraft, such application will be in accordance with Article 4.1 herein. 3. Price. 3.1 The advance payment base prices of the Option Aircraft set forth below and in paragraph 2.1 of Attachment A represent the estimated delivery prices of the Option Aircraft. The Option Aircraft pricing elements and associated pricing terms and conditions are given in Attachment A. 3.2 Price and escalation provisions for Model 737-7H4 aircraft delivering after 2002, are not currently available. The estimated Advance Payment Base Prices shown in paragraph 3.3 below and in paragraph 2.1 of Attachment A are based on currently available price and escalation provisions. As price and escalation provisions become available for Model 737-7H4 aircraft delivering after 2002, such price and escalation provisions will be appropriately applied to the applicable Option Aircraft. For additional information relating to price and escalation provisions applicable to Option Aircraft delivering after 2002 refer to paragraphs 2.2 and 3.2 of Attachment A. P.A. No. 1810 K/SWA SA-8 21 Southwest Airlines Co. 6-1162-RLL-933R7 Page 4 3.3 The Advance Payment Base Prices of the Option Aircraft indicated below do include an amount for special features in addition to those specifically described in Attachment A but do not include any amount for items of Buyer Furnished Equipment (BFE). An estimate for typical special features is *** per Aircraft (expressed in 1992 STE dollars) and for BFE is *** per Aircraft (expressed in delivery year dollars). Month and Year Advance Payment Base of Delivery Price per Option Aircraft -------------- ------------------------- Block M Aircraft*** ------------------- March 2003 April 2003 July 2003 October 2003 Block N Aircraft*** ------------------- January 2004 March 2004 April 2004 August 2004 September 2004 October 2004 Block O Aircraft*** ------------------- January 2005 March 2005 April 2005 July 2005 October 2005 Block P Aircraft*** ------------------- January 2006 March 2006 April 2006 July 2006 October 2006 3.4 The Option Aircraft purchase price will be the applicable basic price thereof at the time of Option Aircraft delivery adjusted in accordance with Boeing's Aircraft escalation provisions contained in the definitive agreement to purchase the Option Aircraft. The purchase price will include the price for Seller Purchased Equipment (SPE) if Buyer has P.A. No. 1810 K/SWA SA-8 22 Southwest Airlines Co. 6-1162-RLL-933R7 Page 5 elected to change Buyer Furnished Equipment (BFE) to SPE. 4. Option Aircraft Payment. 4.1 In consideration of the granting of the option as set forth herein, on or before the date Boeing and Buyer enter into a definitive agreement to purchase the Aircraft, Buyer will pay a deposit to Boeing of $100,000 for each Option Aircraft (Deposit). In the event Buyer exercises its option herein, the amount of the Deposit will be credited against the first advance payment due for such Option Aircraft pursuant to the advance payment schedule set forth in paragraph 3 of Attachment A. The Deposits for the Option Aircraft will be refunded to Buyer, without interest, if the parties do not enter into a definitive Agreement for the Aircraft. In the event that, after the parties enter into a definitive agreement to purchase the Aircraft, Buyer does not exercise its option to purchase the Option Aircraft pursuant to the terms and conditions set forth herein, Boeing will be entitled to retain the Deposits for the Option Aircraft except as provided in paragraphs 6 herein. 4.2 Advance payments in the amount of 30% of the advance payment base price will be payable on the Option Aircraft in accordance with paragraph 3 of Attachment A. The remainder of the Option Aircraft purchase price is due at the time of delivery of the Option Aircraft. 5. Option Exercise. 5.1 To exercise its Option, Buyer will give written or telegraphic notice thereof to Boeing on or before eighteen (18) months prior to the first day of the delivery month of each Option Aircraft. In such notice Buyer will select the Option Model type, and the applicable delivery positions. 5.2 It is understood and agreed that Boeing may accelerate the option exercise dates specified above if Boeing must make production decisions which are dependent on Buyer's decision to buy the Option Aircraft. If Boeing elects to accelerate the option exercise dates, Boeing will do so by giving written or telegraphic notice thereof to Buyer. Such notice will specify the revised option exercise dates, which will not be earlier than 30 days after the date of P.A. No. 1810 K/SWA SA-8 23 Southwest Airlines Co. 6-1162-RLL-933R7 Page 6 transmittal of such notice, and the Option Aircraft delivery positions affected by such revision. If Buyer fails to exercise its option for any Option Aircraft affected by such revised dates, the Deposit applicable to such Option Aircraft will be promptly refunded, with interest, to Buyer. The interest rate for calculation of the interest associated with such refund is the rate of two percent (2%) below the Citibank base rate in effect from time to time during the period the option deposit is held by Boeing. 6. Contract Terms. It is understood that Boeing and Buyer will use their best efforts to enter into a definitive agreement for the Option Aircraft within thirty (30) days after Buyer exercises an option to purchase Option Aircraft pursuant to paragraph 5 covering the detailed terms and conditions for the sale of such Option Aircraft. Such definitive agreement will include the terms and conditions contained herein together with the terms and conditions, not inconsistent herewith, contained in Boeing's then-current standard form of purchase agreement for the sale of Model 737-700 aircraft in effect as of the date of option exercise and such additional terms and conditions as may be mutually agreed upon. In the event the parties have not entered into such an agreement within the time period contemplated herein, either party may, exercisable by written or telegraphic notice given to the other within thirty (30) days after such period, terminate the purchase of such Option Aircraft. 7. Termination of Option to Purchase. Either Boeing or Buyer may terminate the option to purchase an Option Aircraft if any of the following events are not accomplished by the respective dates contemplated in this letter agreement, or in the Agreement, as the case may be: (i) termination of the purchase of the Aircraft under the Agreement for any reason; (ii) payment by Buyer of the Deposit with respect to an Option Aircraft pursuant to paragraph 4.1 herein; (iii) exercise of an option to purchase an Option Aircraft pursuant to the terms hereof. Any termination of an option to purchase by Boeing which is based on the termination of the purchase of P.A. No. 1810 K/SWA SA-8 24 Southwest Airlines Co. 6-1162-RLL-933R7 Page 7 Aircraft under the Agreement will be on a one-for-one basis, for each Aircraft so terminated. Any cancellation of an option to purchase which is based on failure to make the required Deposit or to exercise the option to purchase shall only apply to the Option Aircraft so canceled. Termination of an option to purchase provided by this letter agreement will be caused by either party giving written notice to the other within 10 days after the applicable date. Upon receipt of such notice, all rights and obligations of the parties with respect to an Option Aircraft for which the option to purchase has been terminate will thereupon terminate. If termination is result of a revision of an option exercise date by Boeing pursuant to paragraph 5.2, Boeing will promptly refund to Buyer, without interest, any payments received from Buyer, including the Deposit, with respect to the Option Aircraft for which the option is terminated. If termination is for any other reason, Boeing will promptly refund to Buyer, without interest, any payments received from Buyer with respect to the affected Option Aircraft, except the Deposit, which Buyer may apply to any model Boeing aircraft purchased by Buyer from Boeing at a future date. 8. Confidential Treatment. Buyer understands that certain commercial and financial information contained in this Letter Agreement including any attachments hereto is considered by Boeing as confidential. Buyer agrees that it will treat this Letter Agreement and the P.A. No. 1810 K/SWA SA-8 25 Southwest Airlines Co. 6-1162-RLL-933R7 Page 8 information contained herein as confidential and will not, without the prior written consent of Boeing, disclose this Letter Agreement or any information contained herein to any other person or entity except as provided in Letter Agreement No. 6-1162-RLL-934R1. Very truly yours, THE BOEING COMPANY By: /s/ DAWN S. FOSTER ------------------------ Its: ATTORNEY-IN-FACT ------------------------ ACCEPTED AND AGREED TO this date: March 30, 1999 SOUTHWEST AIRLINES CO. By: /s/ LAURA WRIGHT ------------------------ Its: TREASURER ------------------------ Attachments P.A. No. 1810 K/SWA SA-8 26 Attachment A to 6-1162-RLL-933R7 Page 1 Model 737-7H4 Aircraft 1. Option Aircraft Description and Changes. 1.1 Aircraft Description. The Option Aircraft is described by Boeing Detail Specification D6-38808-1, Dated October 30 ,1996. 1.2 Changes. The Detail Specification will be revised to include: (1) Changes applicable to the basic Model 737-700 aircraft which are developed by Boeing between the date of the Detail Specification and the signing of a definitive agreement to purchase the Option Aircraft. (2) Changes mutually agreed upon. (3) Changes required to obtain a Standard Certificate of Airworthiness. (4) To provide sufficient Option Aircraft manufacturing and procurement lead time it is necessary for Boeing and Buyer to reach final agreement on the Option Aircraft configuration, including BFE/SPE vendor selection fifteen (15) months prior to delivery of each Option Aircraft. If such items are not resolved by the indicated dates, Boeing reserves the right to amend this letter agreement: (i) to adjust the scheduled delivery of the Option Aircraft to a later time period and, (ii) to make such other changes as are appropriate and consistent with the revised Option Aircraft deliveries. 1.3 Effect of Changes. Changes to the Detail Specification incorporated pursuant to the provisions of the clauses above will include the effects of such changes upon Option Aircraft weight, balance, design and performance. Performance guarantees for the Option Aircraft which are mutually acceptable to the parties will be included in the definitive agreement for the Option Aircraft. P.A. No. 1810 K/SWA SA-8 27 Attachment A to 6-1162-RLL-933R7 Page 2 2. Price Description 2.1 Price Elements Per Aircraft 1 2 3 - - - AIRCRAFT & ADV. PMT. AIRCRAFT ESTIMATED SPECIAL ESTIMATED BASE PRICE DELIVERY FEATURES PRICE ESTIMATED ESCALATION (Elements) MO. & YR. (JULY 1992$) ESCALATION SHARING 1 + 2 + 3 - --------- ----------------- ---------- ----------- ---------- BLOCK M - ------- March 2003 *** *** -*** *** April 2003 *** *** -*** *** July 2003 *** *** -*** *** October 2003 *** *** -*** *** BLOCK N - ------- January 2004 *** *** -*** *** March 2004 *** *** -*** *** April 2004 *** *** -*** *** August 2004 *** *** -*** *** September 2004 *** *** -*** *** October 2004 *** *** -*** *** BLOCK O - ------- January 2005 *** *** -*** *** March 2005 *** *** -*** *** April 2005 *** *** -*** *** July 2005 *** *** -*** *** October 2005 *** *** -*** *** BLOCK P - ------- January 2006 *** *** -*** *** March 2006 *** *** -*** *** April 2006 *** *** -*** *** July 2006 *** *** -*** *** October 2006 *** *** -*** *** P.A. No. 1810 K/SWA SA-8 28 Attachment A to 6-1162-RLL-933R7 Page 3 2. Price Description. (Continued) 2.2 Price Adjustments For Option Aircraft Delivering From March 2003 through December 2009. 2.2.1 Special Features. The price for Special Features incorporated in the Option Aircraft Detail Specification will be adjusted to Boeing's then-current prices for such features as of the date of execution of the definitive agreement for the Option Aircraft. 2.2.2 Escalation Adjustments. For escalation provisions applicable to Option Aircraft delivering after 2002, see paragraph 2.2.6 below. 2.2.3 Base Price Adjustments for FAA Changes. The Aircraft Basic Price of the Option Aircraft will be adjusted for any FAA mandated changes incorporated into the Aircraft. 2.2.4 Price Adjustments for Changes. Boeing may adjust the Aircraft Basic Price and the Advance Payment Base Price for any changes mutually agreed upon subsequent to the date that Buyer and Boeing enter into a definitive agreement for the Option Aircraft. 2.2.5 Base Price Adjustments. The Aircraft Basic Price of the Option Aircraft will be adjusted to Boeing's then-current prices as of the date of execution of the definitive agreement for the Option Aircraft in accordance with the agreement reached below. The Aircraft Basic Price starting point for options delivering in 2003 is *** (July 1992 STE), for options delivering in 2004 is *** (July 1992 STE), for options delivering in 2005 through 2009 is *** (July 1992 STE). Such Aircraft Basic Price may increase in accordance with paragraphs 2.2.1, 2.2.2, 2.2.3 and 2.2.4. For any other changes to the Aircraft Basic Price, Boeing may increase the Aircraft Basic Price by a maximum of *** (July 1992 STE) for Aircraft delivering in 2005 and by a maximum of *** (July 1992 STE) per year or portion thereof starting in January 2006. 2.2.6 Prices for Long Lead Time Aircraft. Boeing has not established escalation provisions for Model 737-700 aircraft for delivery 2003 and after. Such escalation provisions (i) will be incorporated into the Option Aircraft definitive agreement when such information is available and (ii) will be the then-current escalation provisions applicable to the same model aircraft and engines delivering in the same time period as the Option Aircraft. The resulting revisions to the definitive agreement will P.A. No. 1810 K/SWA SA-8 29 Attachment A to 6-1162-RLL-933R7 Page 4 include but not be limited to, adjustment of the Aircraft Basic Price of the Option Aircraft, the Advance Payment Base Price, the Aircraft escalation provisions and the advance payment amounts due on the Option Aircraft. 2.2.7 BFE to SPE. An estimate of the total price for items of Buyer Furnished Equipment (BFE) changed to Seller Purchased Equipment (SPE) pursuant to the Configuration Specification is included in the Option Aircraft price build-up. The purchase price of the Option Aircraft will be adjusted by the price charged to Boeing for such items plus 10% of such price. If all BFE except developmental avionics is converted to SPE, Boeing will waive the 10% fee. 3. Advance Payment Schedules, Prices and Adjustments. 3.1 Buyer will pay to Boeing advance payments for the Option Aircraft on the dates and in the amounts determined below. P.A. No. 1810 K/SWA SA-8 30 Attachment A to 6-1162-RLL-933R7 Page 2 Amount Due per Aircraft ----------------------- (Percentage times Due Date of Payment Advance Payment Base Price) - ------------------- Deposit 100,000 (if applicable) 18 months prior to the first 15% (less the day of the scheduled delivery Deposit if any) month of the Aircraft 12 months prior to the first 5% day of the scheduled delivery month of the Aircraft 9 months prior to the first 5% day of the scheduled delivery month of the Aircraft 6 months prior to the first 5% day of the scheduled delivery month of the Aircraft --- Total 30% Any advance payments that would be past due as of the date of signing the definitive purchase agreement for the Option Aircraft in accordance with the above schedule are due and payable on such date. 3.2 Option Aircraft advance payment base prices will be increased or decreased, as appropriate, at the time of signing of the definitive purchase agreement for the Option Aircraft, using the then-current forecasted aircraft escalation factors used by Boeing, to determine the amount of the advance payments to be made by Buyer on the Option Aircraft. P.A. No. 1810 K/SWA SA-8 31 Attachment B to 6-1162-RLL-933R7 Page 1 PRICE ADJUSTMENT DUE TO ECONOMIC FLUCTUATIONS AIRCRAFT PRICE ADJUSTMENT (July 1992 Base Price) 1. Formula. The Aircraft Price Adjustment will be determined at the time of Aircraft delivery in accordance with the following formula: Pa = (P)(L + M - 1) Where: Pa = Aircraft Price Adjustment. L = .65 x ECI ----- 116.2 M = .35 x ICI ----- 115.9 P = Aircraft Basic Price (as set forth in Article 3.2 of this Agreement). ECI = A value using the "Employment Cost Index for workers in aerospace manufacturing" (aircraft manufacturing, standard industrial classification code 3721, compensation, base month and year June 1989 = 100), as released by the Bureau of Labor Statistics, U.S. Department of Labor on a quarterly basis for the months of March, June, September and December, calculated as follows: A three-month arithmetic average value (expressed as a decimal and rounded to the nearest tenth) will be determined using the months set forth in the table below for the applicable Aircraft, with the released Employment Cost Index value described above for the month of March also being used for the months of January and February; the value for June also used for April and May; the value for September also used for July and August; and the value for December also used for October and November. P.A. No. 1810 K/SWA SA-8 32 Attachment B to 6-1162-RLL-933R7 Page 2 ICI = The three-month arithmetic average of the released monthly values for the Industrial Commodities Index as set forth in the "Producer Prices and Price Index" (Base Year 1982 = 100) as released by the Bureau of Labor Statistics, U.S. Department of Labor values (expressed as a decimal and rounded to the nearest tenth) for the months set forth in the table below for the applicable Aircraft. In determining the value of L, the ratio of ECI divided by 116.2 will be expressed as a decimal rounded to the nearest ten-thousandth and then multiplied by .65 with the resulting value also expressed as a decimal and rounded to the nearest ten-thousandth. In determining the value of M, the ratio of ICI divided by 115.9 will be expressed as a decimal rounded to the nearest ten-thousandth and then multiplied by .35 with the resulting value also expressed as a decimal and rounded to the nearest ten-thousandth. Months to be Utilized Month of Scheduled in Determining the Aircraft Delivery Value of ECI and ICI - ----------------- ------------------------- January June B, July B, Aug. B February July B, Aug. B, Sept. B March Aug. B, Sept. B, Oct. B April Sept. B, Oct. B, Nov. B May Oct. B, Nov. B, Dec. B June Nov. B, Dec. B, Jan. D July Dec. B, Jan. D, Feb. D August Jan. D, Feb. D, Mar. D September Feb. D, Mar. D, Apr. D October Mar. D, Apr. D, May D November Apr. D, May D, June D December May D, June D, July D The following definitions of B and D will apply: B = The calendar year before the year in which the scheduled month of delivery as set forth in Paragraph 1 occurs. D = The calendar year during which the scheduled month of delivery as set forth in Paragraph 1 occurs. P.A. No. 1810 K/SWA SA-8 33 Attachment B to 6-1162-RLL-933R7 Page 3 2. If at the time of delivery of an Aircraft Boeing is unable to determine the Aircraft Price Adjustment because the applicable values to be used to determine the ECI and ICI have not been released by the Bureau of Labor Statistics, then: 2.1 The Aircraft Price Adjustment, to be used at the time of delivery of each of the Aircraft, will be determined by utilizing the escalation provisions set forth above. The values released by the Bureau of Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft delivery will be used to determine the ECI and ICI values for the applicable months (including those noted as preliminary by the Bureau of Labor Statistics) to calculate the Aircraft Price Adjustment. If no values have been released for an applicable month, the provisions set forth in Paragraph 2.2 below will apply. If prior to delivery of an Aircraft the U.S. Department of Labor changes the base year for determination of the ECI or ICI values as defined above, such rebased values will be incorporated in the Aircraft Price Adjustment calculation. The payment by Buyer to Boeing of the amount of the Purchase Price for such Aircraft, as determined at the time of Aircraft delivery, will be deemed to be the payment for such Aircraft required at the delivery thereof. 2.2 If prior to delivery of an Aircraft the U.S. Department of Labor substantially revises the methodology used for the determination of the values to be used to determine the ECI and ICI values (in contrast to benchmark adjustments or other corrections of previously released values), or for any reason has not released values needed to determine the applicable Aircraft Price Adjustment, the parties will, prior to delivery of any such Aircraft, select a substitute for such values from data published by the Bureau of Labor Statistics or other similar data reported by non-governmental United States organizations, such substitute to lead in application to the same adjustment result, insofar as possible, as would have been achieved by continuing the use of the original values as they may have fluctuated during the applicable time period. Appropriate revision of the formula will be made as required to reflect any substitute values. However, if within 24 months from delivery of the Aircraft the Bureau of Labor Statistics should resume releasing values for the months needed to determine the Aircraft Price Adjustment, such values will be used to determine any increase or decrease in the Aircraft Price Adjustment for the Aircraft from that determined at the time of delivery of such Aircraft. P.A. No. 1810 K/SWA SA-8 34 Attachment B to 6-1162-RLL-933R7 Page 4 2.3 In the event escalation provisions are made non-enforceable or otherwise rendered null and void by any agency of the United States Government, the parties agree, to the extent they may lawfully do so, to equitably adjust the Purchase Price of any affected Aircraft to reflect an allowance for increases or decreases in labor compensation and material costs occurring since February, 1992, which is consistent with the applicable provisions of paragraph 1 of this Exhibit D. 3. For the calculations herein, the values released by the Bureau of Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft delivery will be used to determine the ECI and ICI values for the applicable months (including those noted as preliminary by the Bureau of Labor Statistics) to calculate the Aircraft Price Adjustment. Note: Any rounding of a number, as required under this Exhibit D with respect to escalation of the airframe price, will be accomplished as follows: if the first digit of the portion to be dropped from the number to be rounded is five or greater, the preceding digit will be raised to the next higher number. P.A. No. 1810 K/SWA SA-8 35 EXHIBIT 10.1 Supplemental Agreement No. 9 to Purchase Agreement No. 1810 between The Boeing Company and SOUTHWEST AIRLINES CO. Relating to Boeing Model 737-7H4 Aircraft THIS SUPPLEMENTAL AGREEMENT, entered into as of April 29, 1999, by and between THE BOEING COMPANY, a Delaware corporation with its principal offices in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas corporation with its principal offices in City of Dallas, State of Texas (Buyer); WHEREAS, the parties hereto entered into Purchase Agreement No. 1810 dated January 19, 1994, relating to Boeing Model 737-7H4 aircraft (the Agreement) and; WHEREAS, Buyer has agreed to exercise the option to purchase six (6) additional Option Aircraft and to accelerate delivery of those Option Aircraft from July 2006 (2) and October 2006 four (4) to September 2000 (1), October 2000 (1), November 2000 (1), December 2000 (1), January 2001 (1) and February 2001 (1); NOW THEREFORE, in consideration of the mutual covenants herein contained, the parties agree to amend the Agreement as follows: - -------------------------------------------------------------------------------- *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 SA-9-1 K/SWA 36 1. The Table of Contents of the Agreement is deleted in its entirety and a new Table of Contents is attached hereto and incorporated into the Agreement by this reference. 2. Article 1, entitled "Subject Matter of Sale," paragraph 1.1 entitled "The Aircraft" is deleted in its entirety and replaced by a new paragraph 1.1 revised to reflect one hundred forty-two (142) Aircraft. Such new page 1-1 is attached hereto and incorporated into the Agreement by this reference. 3. Article 2, entitled "Delivery, Title and Risk of Loss," paragraph 2.1, entitled "Time of Delivery," is deleted in its entirety and replaced by a new paragraph 2.1 revised to add six (6) Block "L" Aircraft for delivery in September 2000 (1), October 2000 (1), November 2000 (1), December 2000 (1), January 2001 (1) and February 2001 (1). Such new pages 2-1, 2-2 and 2-3 are attached hereto and incorporated into the Agreement by this reference. 4. Article 3, entitled "Price of Aircraft", paragraph 3.4 entitled "Advance Payment Base Price," subparagraph 3.4.1 entitled "Advance Payment Base Price" is revised by adding Advance Payment Base Prices for the exercised Block "L" September 2000, October 2000, November 2000, December 2000, January 2001 and February 2001 Aircraft, and by revising the Advance Payment Base Prices to reflect current escalation factors as of the date of this Supplemental Agreement for the Block "H" April 2001 and October 2001 Aircraft and the Block "L" November 2000, December 2000, July 2001, September 2001 and October 2001 Aircraft. Such new pages 3-1, 3-2, 3-3 and 3-4 are attached hereto and incorporated into the Agreement by this reference. 5. Letter Agreement No. 6-1162-RLL-933R7 entitled "Option Aircraft" is deleted in its entirety and replaced with Letter Agreement No. 6-1162-RLL-933R8 attached hereto and incorporated herein by this reference. The third paragraph is revised to refer to forty-six (46) Rollover Option Aircraft. Article 2 entitled "Delivery of Rollover Option Aircraft," paragraph 2.1 is revised to change the quantity of Rollover Option Aircraft from twelve (12) to six (6) in the year 2009; paragraph 2.2 and subparagraphs 2.2.1 and 2.2.2 are revised by changing the quantity of Rollover Option Aircraft from fifty-two (52) to forty-six (46). 6. All references in the Letter Agreements associated with Purchase Agreement No. 1810 shall be deemed to refer to P.A. No. 1810 SA-9-2 K/SWA 37 the purchase by Buyer of one hundred forty-two (142) Model 737-7H4 Aircraft, sixty-two (62) Model 737-7H4 Option Aircraft and forty-six (46) Model 737-7H4 Rollover Option Aircraft, to the extent such reference is not specifically addressed herein. P.A. No. 1810 SA-9-3 K/SWA 38 7. Concurrent with execution of this Supplemental Agreement, Buyer will pay to $ ***. Such amount reflects the difference in advance payments due as a result of the exercise of the Option to purchase six Aircraft, the revision in Advance Payment Base Price for Aircraft as described above and the deposits due for six Rollover Option Aircraft converted to Option Aircraft. The Agreement will be deemed to be supplemented to the extent herein provided and as so supplemented will continue in full force and effect. EXECUTED IN DUPLICATE as of the day and year first above written. THE BOEING COMPANY SOUTHWEST aIRLINES cO. By: /S/ DAWN S. FOSTER By: /S/ LAURA WRIGHT ------------------------ ------------------------------------- Its: ATTORNEY-IN-FACT Its: TREASURER ----------------------- ------------------------------------ P.A. No. 1810 SA-9-4 K/SWA 39 PURCHASE AGREEMENT between THE BOEING COMPANY and SOUTHWEST AIRLINES CO. Relating to Boeing Model 737-7H4 Aircraft Purchase Agreement Number 1810 - -------------------------------------------------------------------------------- *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 15-1 K/SWA 40 TABLE OF CONTENTS Page SA Number Number ------ ------ ARTICLES - -------- 1. Subject Matter of Sale........................................ 1-1 SA-9 2. Delivery, Title and Risk of Loss....................................................... 2-1 SA-9 3. Price of Aircraft............................................. 3-1 SA-9 4. Taxes......................................................... 4-1 5. Payment....................................................... 5-1 6. Excusable Delay............................................... 6-1 7. Changes to the Detail Specification................................................. 7-1 SA-1 8. Federal Aviation Requirements and Certificates and Export License............................... 8-1 9. Representatives, Inspection, Flights and Test Data......................................... 9-1 10. Assignment, Resale or Lease................................... 10-1 11. Termination for Certain Events................................ 11-1 12. Product Assurance; Disclaimer and Release; Exclusion of Liabilities; Customer Support; Indemnification and Insurance................................................. 12-1 13. Buyer Furnished Equipment and Spare Parts................................................... 13-1 14. Contractual Notices and Requests.............................. 14-1 15. Miscellaneous................................................. 15-1 P.A. No. 1810 15-2 K/SWA 41 TABLE OF CONTENTS SA Number ------ EXHIBITS - -------- A Aircraft Configuration SA-1 B Product Assurance Document SA-1 C Customer Support Document D Price Adjustments Due to Economic Fluctuations - Aircraft E Buyer Furnished Equipment Provisions Document F Defined Terms Document LETTER AGREEMENTS 1810-1 Waiver of Aircraft Demonstration Flight P.A. No. 1810 15-3 K/SWA 42 TABLE OF CONTENTS SA Number ------ RESTRICTED LETTER AGREEMENTS - ---------------------------- 6-1162-RLL-932 Promotional Support 6-1162-RLL-933R8 Option Aircraft SA-9 6-1162-RLL-934R1 Disclosure of Confidential SA-1 Information 6-1162-RLL-935R1 Performance Guarantees SA-1 6-1162-RLL-936R4 Certain Contractual Matters SA-4 6-1162-RLL-937 Alternate Advance Payment Schedule 6-1162-RLL-938 *** 6-1162-RLL-939R1 Certification Flight Test Aircraft SA-1 6-1162-RLL-940R1 Training Matters SA-1 6-1162-RLL-941R1 Other Matters SA-1 6-1162-RLL-942 Open Configuration Matters 6-1162-RLL-943R1 Substitution Rights SA-6 6-1162-RLL-944 Airframe Maintenance Material Cost Protection Program 6-1162-RLL-945 Comparison of 737-7H4 and 737-3H4 Block Fuel Burn 6-1162-RLL-1855R3 Additional Contractual Matters SA-4 6-1162-RLL-1856 *** SA-1 6-1162-RLL-1857 Service Ready Validation Program SA-1 Field Test 6-1162-RLL-1858R1 Escalation Matters SA-4 P.A. No. 1810 15-4 K/SWA 43 TABLE OF CONTENTS CON'T SA Number ------ RESTRICTED LETTER AGREEMENTS - ---------------------------- 6-1162-RLL-2036 Amortization of Costs for Customer Unique Changes SA-1 6-1162-RLL-2037 Reconciliation of the Aircraft SA-1 Basic Price 6-1162-RLL-2073 Maintenance Training Matters SA-1 P.A. No. 1810 15-5 K/SWA 44 PURCHASE AGREEMENT NO. 1810 Relating to BOEING MODEL 737-7H4 AIRCRAFT ----------------------------- This Agreement is entered into as of January 19th 1994, by and between The Boeing Company, a Delaware corporation, with its principal office in Seattle, Washington (Boeing), and Southwest Airlines Co., a Texas corporation, with its principal office in the City of Dallas, State of Texas (Buyer). Accordingly, Boeing and Buyer agree as follows: P.A. No. 1810 15-6 K/SWA 45 ARTICLE 1. Subject Matter of Sale. 1.1 The Aircraft. Subject to the terms and conditions of this Agreement, Boeing will manufacture and deliver to Buyer and Buyer will purchase and accept delivery from Boeing of one hundred forty-two (142) Boeing Model 737-7H4 aircraft (the Aircraft) manufactured in accordance with Boeing Detail Specification D6-38808-1, dated October 30, 1996, as described in Exhibit A, as modified from time to time in accordance with this Agreement (Detail Specification). 1.2 Additional Goods and Services. In connection with the sale of the Aircraft, Boeing will also provide to Buyer certain other things under this Agreement, including data, documents, training and services, all as described in this Agreement. 1.3 Performance Guarantees. Any performance guarantees applicable to the Aircraft will be expressly included in this Agreement. Where performance guarantees are included in this Agreement other than within the Detail Specification, such guarantees will be treated as being incorporated in the Detail Specification by this reference. 1.4 Defined Terms. For ease of use, certain terms are treated as defined terms in this Agreement. Such terms are identified with a capital letter and set forth and/or defined in Exhibit F. P.A. No. 1810 15-7 K/SWA 46 ARTICLE 2. Delivery, Title and Risk of Loss. 2.1 Time of Delivery. The Aircraft will be delivered to Buyer by Boeing, assembled and ready for flight and Buyer will accept delivery of the Aircraft, in accordance with the following schedule: Month and Year of Delivery Quantity of Aircraft ----------- -------------------- Block A Aircraft ---------------- October 1997 Two (2) November 1997 Two (2) Block B Aircraft ---------------- January 1998 Two (2) February 1998 Three (3) March 1998 Two (2) April 1998 Two (2) May 1998 Two (2) June 1998 One (1) July 1998 Two (2) September 1998 Two (2) Block C Aircraft ---------------- February 1999 Four (4) May 1999 Four (4) July 1999 Four (4) August 1999 One (1) September 1999 Three (3) Block D Aircraft ---------------- November 1999 Two (2) December 1999 One (1) January 2000 One (1) March 2000 Four (4) July 2000 Four (4) September 2000 Three (3) Block E Aircraft ---------------- January 2001 Three (3) March 2001 Three (3) July 2001 Three (3) September 2001 Three (3) P.A. No. 1810 15-8 K/SWA 47 Block F Aircraft ---------------- October 1998 One (1) November 1998 Two (2) December 1998 Two (2) Block G Aircraft ---------------- March 1999 Two (2) Block H Aircraft ---------------- June 1999 Two (2) July 1999 One (1) August 1999 One (1) September 1999 Two (2) October 1999 One (1) April 2000 Three (3) October 2000 Three (3) April 2001 Three (3) October 2001 Three (3) Block I Aircraft ---------------- January 2002 Four (4) March 2002 Four (4) April 2002 Two (2) July 2002 Four (4) October 2002 Four (4) Block J Aircraft ---------------- January 2003 Four (4) March 2003 One (1) Block K Aircraft ---------------- April 2004 Two (2) July 2004 Three (3) Block L Aircraft ---------------- October 1999 One (1) November 1999 Two (2) December 1999 One (1) June 2000 Three (3) July 2000 One (1) August 2000 Two (2) September 2000 One (1) October 2000 One (1) November 2000 Three (3) December 2000 Two (2) January 2001 One (1) February 2001 One (1) July 2001 One (1) September 2001 One (1) October 2001 One (1) September 2002 Three (3) P.A. No. 1810 15-9 K/SWA 48 2.2 Notice of Target Delivery Date. Boeing will give Buyer notice of the Target Delivery Date of the Aircraft approximately 30 days prior to the scheduled month of delivery. 2.3 Notice of Delivery Date. If Boeing gives Buyer at least 7 days' notice of the delivery date of the Aircraft, and an Aircraft delivery is delayed beyond such delivery date due to the responsibility of Buyer, Buyer will reimburse Boeing for all costs incurred by Boeing as a result of such delay, including amounts for storage, insurance, Taxes, preservation or protection of the Aircraft and interest on payments due. 2.4 Place of Delivery. The Aircraft will be delivered at an airport facility selected by Boeing in the State of Washington, unless mutually agreed otherwise. 2.5 Title and Risk of Loss. Title to and risk of loss of an Aircraft will pass from Boeing to Buyer upon delivery of such Aircraft, but not prior thereto. 2.6 Bill of Sale. Upon delivery of an Aircraft Boeing will deliver to Buyer a bill of sale conveying good title to such Aircraft, free of all liens, claims, charges and encumbrances of every kind whatsoever, and such other appropriate documents of title as Buyer may reasonably request. P.A. No. 1810 15-10 K/SWA 49 ARTICLE 3. Price of Aircraft. 3.1 Definitions. 3.1.1 Special Features are the features incorporated in Exhibit A which have been selected by Buyer. 3.1.2 Base Aircraft Price is the Aircraft Basic Price excluding the price of Special Features. 3.1.3 Aircraft Basic Price is comprised of the Base Aircraft Price and the price of the Special Features. 3.1.4 Economic Price Adjustment is the adjustment to the Aircraft Basic Price (Base Aircraft and Special Features) as calculated pursuant to Exhibit D. 3.1.5 Aircraft Price is the total amount Buyer is to pay for the Aircraft at the time of delivery. 3.2 Aircraft Basic Price. The Aircraft Basic Price, expressed in July 1992 dollars, is set forth below: Base Special Aircraft Aircraft Price Features Basic Price Block A, B, C, D & E Aircraft $ *** $ *** $ *** Block F & G Aircraft $ *** $ *** $ *** Block H Aircraft $ *** $ *** $ *** Block I Aircraft $ *** $ *** $ *** Block J Aircraft $ *** $ *** $ *** Block K Aircraft $ *** $ *** $ *** Block L Aircraft $ *** $ *** $ *** 3.3 Aircraft Price. The Aircraft Price will be established at the time of delivery of such Aircraft to Buyer and will be the sum of: 3.3.1 the Aircraft Basic Price, which is *** for the Block A, B, C, D and E Aircraft, *** for the Block F and G Aircraft, *** for the Block H Aircraft, *** for the P.A. No. 1810 15-11 K/SWA 50 Block I Aircraft, *** for the Block J Aircraft, *** for the Block K Aircraft and *** for the Block L Aircraft; plus 3.3.2 the Economic Price Adjustments for the Aircraft Basic Price, as calculated pursuant to the formulas set forth in Exhibit D (Price Adjustments Due to Economic Fluctuations - Aircraft); plus 3.3.3 other price adjustments made pursuant to this Agreement or other written agreements executed by Boeing and Buyer. 3.4 Advance Payment Base Price. 3.4.1 Advance Payment Base Price. For advance payment purposes, the following estimated delivery prices of the Aircraft (Advance Payment Base Price) have been established, using currently available forecasts of the escalation factors used by Boeing as of the date of signing this Agreement. The Advance Payment Base Price of each Aircraft is set forth below: Month and Year of Advance Payment Base Scheduled Delivery Price per Aircraft - ------------------ ------------------ Block A Aircraft *** ---------------- October 1997 November 1997 Block B Aircraft *** ---------------- January 1998 February 1998 March 1998 April 1998 May 1998 June 1998 July 1998 September 1998 Block C Aircraft *** ---------------- February 1999 May 1999 July 1999 August 1999 September 1999 Block D Aircraft *** ---------------- November 1999 December 1999 January 2000 March 2000 July 2000 September 2000 P.A. No. 1810 15-12 K/SWA 51 Block E Aircraft *** ---------------- January 2001 March 2001 July 2001 September 2001 Block F Aircraft *** ---------------- October 1998 November 1998 December 1998 Block G Aircraft *** ---------------- March 1999 Block H Aircraft *** ---------------- June 1999 July 1999 August 1999 September 1999 October 1999 April 2000 October 2000 April 2001 October 2001 Block I Aircraft *** ---------------- January 2002 March 2002 April 2002 July 2002 October 2002 Block J Aircraft *** ---------------- January 2003 March 2003 Block K Aircraft *** ---------------- April 2004 July 2004 P.A. No. 1810 15-13 K/SWA 52 Block L Aircraft *** ---------------- October 1999 November 1999 December 1999 June 2000 July 2000 August 2000 September 2000 October 2000 November 2000 December 2000 January 2001 February 2001 July 2001 September 2001 October 2001 September 2002 3.4.2 Adjustment of Advance Payment Base Prices - Long-Lead Aircraft. For Aircraft scheduled for delivery 36 months or more after the date of this Agreement, the Advance Payment Base Prices appearing in Article 3.4.1 will be used to determine the amount of the first advance payment to be made by Buyer on the Aircraft. No later than 25 months before the scheduled month of delivery of each affected Aircraft, Boeing will increase or decrease the Advance Payment Base Price of such Aircraft as required to reflect the effects of (i) any adjustments in the Aircraft Basic Price pursuant to this Agreement and (ii) the then-current forecasted escalation factors used by Boeing. Boeing will provide the adjusted Advance Payment Base Prices for each affected Aircraft to Buyer, and the advance payment schedule will be considered amended to substitute such adjusted Advance Payment Base Prices. P.A. No. 1810 15-14 K/SWA 53 6-1162-RLL-933R8 Southwest Airlines Co. P.O. Box 36611 - Love Field Dallas, Texas 75235 Subject: Letter Agreement No. 6-1162-RLL-933R8 to Purchase Agreement No. 1810 - Option Aircraft This Letter Agreement amends Purchase Agreement No. 1810 dated as of January 19, 1994 (the Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 aircraft (Aircraft). All terms used and not defined herein will have the same meaning as in the Agreement. In consideration of the purchase by Buyer of the Aircraft, Boeing hereby agrees to manufacture and sell to Buyer sixty-two (62) additional Model 737-7H4 aircraft as described in paragraph 1 of Attachment A hereto (Option Aircraft) and forty-six (46) Model 737-7H4 Rollover Option Aircraft (Rollover Option Aircraft), subject to the terms and conditions set forth below. 1. Delivery of Option Aircraft. The Option Aircraft will be delivered to Buyer during or before the months set forth in the following schedule: - -------------------------------------------------------------------------------- *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 K/SWA SA-9 54 Southwest Airlines Co. 6-1162-RLL-933R8 Page 2 Number of Option Month and Year Option Aircraft of Delivery Aircraft Block - -------------- -------- -------- March 2003 Three (3) M April 2003 Two (2) M July 2003 Four (4) M October 2003 Four (4) M January 2004 Four (4) N March 2004 One (1) N April 2004 One (1) N August 2004 Two (2) N September 2004 Three (3) N October 2004 Two (2) N Number of Option Month and Year Option Aircraft of Delivery Aircraft Block - -------------- -------- -------- January 2005 Four (4) O March 2005 Four (4) O April 2005 Two (2) O July 2005 Four (4) O October 2005 Four (4) O January 2006 Four (4) P March 2006 Four (4) P April 2006 Two (2) P July 2006 Four (4) P October 2006 Four (4) P 2. Delivery of Rollover Option Aircraft. 2.1 The Rollover Option Aircraft will be delivered to Buyer during or before the years set forth in the following schedule: Option Year of Number of Aircraft Delivery Option Aircraft Block - -------- --------------- -------- 2007 Twenty (20) Q 2008 Twenty (20) R 2009 Six (6) S 2.2 The forty-six (46) Rollover Option Aircraft are offered to Buyer subject to the following conditions: P.A. No. 1810 K/SWA SA-9 55 Southwest Airlines Co. 6-1162-RLL-933R8 Page 3 2.2.1 Buyer can exercise any forty-six (46) of the sixty-two (62) Option Aircraft, and will be offered a Rollover Option Aircraft for each option aircraft exercised up to and including forty-six (46). 2.2.2 Conversely to Article 2.2.1 above, if Buyer does not exercise a minimum of forty-six (46) Option Aircraft, one Rollover Option Aircraft will be deleted for each Option Aircraft not exercised by Buyer. 2.2.3 When Buyer exercises one or more Option Aircraft, Boeing will offer the same quantity of Rollover Option Aircraft to Buyer in the years identified in Article 2.1 above. 2.2.4 The Rollover Option Aircraft delivery month offered by Boeing to Buyer will be at least 24 months from the Option exercise date of the corresponding option. 2.2.5 When Boeing offers the Rollover Option Aircraft to Buyer, Buyer will accept such Rollover Option Aircraft by wire transferring $100,000 to Boeing. In the event Buyer exercises its option to purchase the Rollover Option Aircraft, such application will be in accordance with Article 4.1 herein. 3. Price. 3.1 The advance payment base prices of the Option Aircraft set forth below and in paragraph 2.1 of Attachment A represent the estimated delivery prices of the Option Aircraft. The Option Aircraft pricing elements and associated pricing terms and conditions are given in Attachment A. 3.2 Price and escalation provisions for Model 737-7H4 aircraft delivering after 2002, are not currently available. The estimated Advance Payment Base Prices shown in paragraph 3.3 below and in paragraph 2.1 of Attachment A are based on currently available price and escalation provisions. As price and escalation provisions become available for Model 737-7H4 aircraft delivering after 2002, such price and escalation provisions will be appropriately applied to the applicable Option Aircraft. For additional information relating to price and escalation provisions applicable to Option Aircraft delivering after 2002 refer to paragraphs 2.2 and 3.2 of Attachment A. P.A. No. 1810 K/SWA SA-9 56 Southwest Airlines Co. 6-1162-RLL-933R8 Page 4 3.3 The Advance Payment Base Prices of the Option Aircraft indicated below do include an amount for special features in addition to those specifically described in Attachment A but do not include any amount for items of Buyer Furnished Equipment (BFE). An estimate for typical special features is $ *** per Aircraft (expressed in 1992 STE dollars) and for BFE is $ *** per Aircraft (expressed in delivery year dollars). Month and Year Advance Payment Base of Delivery Price per Option Aircraft - ----------- ------------------------- Block M Aircraft ---------------- March 2003 *** April 2003 *** July 2003 *** October 2003 *** Block N Aircraft ---------------- January 2004 *** March 2004 *** April 2004 *** August 2004 *** September 2004 *** October 2004 *** Block O Aircraft ---------------- January 2005 *** March 2005 *** April 2005 *** July 2005 *** October 2005 *** Block P Aircraft ---------------- January 2006 *** March 2006 *** April 2006 *** July 2006 *** October 2006 *** 3.4 The Option Aircraft purchase price will be the applicable basic price thereof at the time of Option Aircraft delivery adjusted in accordance with Boeing's Aircraft escalation provisions contained in the definitive agreement to purchase the Option Aircraft. The purchase price will include the price for Seller Purchased Equipment (SPE) if Buyer has elected to change Buyer Furnished Equipment (BFE) to SPE. P.A. No. 1810 K/SWA SA-9 57 Southwest Airlines Co. 6-1162-RLL-933R8 Page 5 4. Option Aircraft Payment. 4.1 In consideration of the granting of the option as set forth herein, on or before the date Boeing and Buyer enter into a definitive agreement to purchase the Aircraft, Buyer will pay a deposit to Boeing of $100,000 for each Option Aircraft (Deposit). In the event Buyer exercises its option herein, the amount of the Deposit will be credited against the first advance payment due for such Option Aircraft pursuant to the advance payment schedule set forth in paragraph 3 of Attachment A. The Deposits for the Option Aircraft will be refunded to Buyer, without interest, if the parties do not enter into a definitive Agreement for the Aircraft. In the event that, after the parties enter into a definitive agreement to purchase the Aircraft, Buyer does not exercise its option to purchase the Option Aircraft pursuant to the terms and conditions set forth herein, Boeing will be entitled to retain the Deposits for the Option Aircraft except as provided in paragraphs 6 herein. 4.2 Advance payments in the amount of 30% of the advance payment base price will be payable on the Option Aircraft in accordance with paragraph 3 of Attachment A. The remainder of the Option Aircraft purchase price is due at the time of delivery of the Option Aircraft. 5. Option Exercise. 5.1 To exercise its Option, Buyer will give written or telegraphic notice thereof to Boeing on or before eighteen (18) months prior to the first day of the delivery month of each Option Aircraft. In such notice Buyer will select the Option Model type, and the applicable delivery positions. 5.2 It is understood and agreed that Boeing may accelerate the option exercise dates specified above if Boeing must make production decisions which are dependent on Buyer's decision to buy the Option Aircraft. If Boeing elects to accelerate the option exercise dates, Boeing will do so by giving written or telegraphic notice thereof to Buyer. Such notice will specify the revised option exercise dates, which will not be earlier than 30 days after the date of P.A. No. 1810 K/SWA SA-9 58 Southwest Airlines Co. 6-1162-RLL-933R8 Page 6 transmittal of such notice, and the Option Aircraft delivery positions affected by such revision. If Buyer fails to exercise its option for any Option Aircraft affected by such revised dates, the Deposit applicable to such Option Aircraft will be promptly refunded, with interest, to Buyer. The interest rate for calculation of the interest associated with such refund is the rate of two percent (2%) below the Citibank base rate in effect from time to time during the period the option deposit is held by Boeing. 6. Contract Terms. It is understood that Boeing and Buyer will use their best efforts to enter into a definitive agreement for the Option Aircraft within thirty (30) days after Buyer exercises an option to purchase Option Aircraft pursuant to paragraph 5 covering the detailed terms and conditions for the sale of such Option Aircraft. Such definitive agreement will include the terms and conditions contained herein together with the terms and conditions, not inconsistent herewith, contained in Boeing's then-current standard form of purchase agreement for the sale of Model 737-700 aircraft in effect as of the date of option exercise and such additional terms and conditions as may be mutually agreed upon. In the event the parties have not entered into such an agreement within the time period contemplated herein, either party may, exercisable by written or telegraphic notice given to the other within thirty (30) days after such period, terminate the purchase of such Option Aircraft. 7. Termination of Option to Purchase. Either Boeing or Buyer may terminate the option to purchase an Option Aircraft if any of the following events are not accomplished by the respective dates contemplated in this letter agreement, or in the Agreement, as the case may be: (i) termination of the purchase of the Aircraft under the Agreement for any reason; (ii) payment by Buyer of the Deposit with respect to an Option Aircraft pursuant to paragraph 4.1 herein; (iii) exercise of an option to purchase an Option Aircraft pursuant to the terms hereof. Any termination of an option to purchase by Boeing which is based on the termination of the purchase of P.A. No. 1810 K/SWA SA-9 59 Southwest Airlines Co. 6-1162-RLL-933R8 Page 7 Aircraft under the Agreement will be on a one-for-one basis, for each Aircraft so terminated. Any cancellation of an option to purchase which is based on failure to make the required Deposit or to exercise the option to purchase shall only apply to the Option Aircraft so canceled. Termination of an option to purchase provided by this letter agreement will be caused by either party giving written notice to the other within 10 days after the applicable date. Upon receipt of such notice, all rights and obligations of the parties with respect to an Option Aircraft for which the option to purchase has been terminate will thereupon terminate. If termination is result of a revision of an option exercise date by Boeing pursuant to paragraph 5.2, Boeing will promptly refund to Buyer, without interest, any payments received from Buyer, including the Deposit, with respect to the Option Aircraft for which the option is terminated. If termination is for any other reason, Boeing will promptly refund to Buyer, without interest, any payments received from Buyer with respect to the affected Option Aircraft, except the Deposit, which Buyer may apply to any model Boeing aircraft purchased by Buyer from Boeing at a future date. 8. Confidential Treatment. Buyer understands that certain commercial and financial information contained in this Letter Agreement including any attachments hereto is considered by Boeing as confidential. Buyer agrees that it will treat this Letter Agreement and the P.A. No. 1810 K/SWA SA-9 60 Southwest Airlines Co. 6-1162-RLL-933R8 Page 8 information contained herein as confidential and will not, without the prior written consent of Boeing, disclose this Letter Agreement or any information contained herein to any other person or entity except as provided in Letter Agreement No. 6-1162-RLL-934R1. Very truly yours, THE BOEING COMPANY By /S/ DAWN S. FOSTER -------------------------- Its ATTORNEY-IN-FACT ------------------------ ACCEPTED AND AGREED TO this date: April 29, 1999 SOUTHWEST AIRLINES CO. By /S/ LAURA WRIGHT -------------------------- Its TREASURER ------------------------ Attachments P.A. No. 1810 K/SWA SA-9 61 Attachment A to 6-1162-RLL-933R8 Page 1 Model 737-7H4 Aircraft 1. Option Aircraft Description and Changes. 1.1 Aircraft Description. The Option Aircraft is described by Boeing Detail Specification D6-38808-1, Dated October 30 ,1996. 1.2 Changes. The Detail Specification will be revised to include: (1) Changes applicable to the basic Model 737-700 aircraft which are developed by Boeing between the date of the Detail Specification and the signing of a definitive agreement to purchase the Option Aircraft. (2) Changes mutually agreed upon. (3) Changes required to obtain a Standard Certificate of Airworthiness. (4) To provide sufficient Option Aircraft manufacturing and procurement lead time it is necessary for Boeing and Buyer to reach final agreement on the Option Aircraft configuration, including BFE/SPE vendor selection fifteen (15) months prior to delivery of each Option Aircraft. If such items are not resolved by the indicated dates, Boeing reserves the right to amend this letter agreement: (i) to adjust the scheduled delivery of the Option Aircraft to a later time period and, (ii) to make such other changes as are appropriate and consistent with the revised Option Aircraft deliveries. 1.3 Effect of Changes. Changes to the Detail Specification incorporated pursuant to the provisions of the clauses above will include the effects of such changes upon Option Aircraft weight, balance, design and performance. Performance guarantees for the Option Aircraft which are mutually acceptable to the parties will be included in the definitive agreement for the Option Aircraft. P.A. No. 1810 K/SWA SA-9 62 Attachment A to 6-1162-RLL-933 Page 2 P.A. No. 1810 K/SWA 2. Price Description 2.1 Price Elements Per Aircraft 1 2 3 - - - AIRCRAFT & ADV. PMT. AIRCRAFT ESTIMATED SPECIAL ESTIMATED BASE PRICE DELIVERY FEATURES PRICE ESTIMATED ESCALATION (Elements) MO. & YR. (JULY 1992$) ESCALATION SHARING 1 + 2 + 3 - --------- ---------------- ---------- ---------- ----------- BLOCK M - ------- March 2003 $ *** *** *** *** April 2003 $ *** *** *** *** July 2003 $ *** *** *** *** October 2003 $ *** *** *** *** BLOCK N - ------- January 2004 $ *** *** *** *** March 2004 $ *** *** *** *** April 2004 $ *** *** *** *** August 2004 $ *** *** *** *** September 2004 $ *** *** *** *** October 2004 $ *** *** *** *** BLOCK O - ------- January 2005 $ *** *** *** *** March 2005 $ *** *** *** *** April 2005 $ *** *** *** *** July 2005 $ *** *** *** *** October 2005 $ *** *** *** *** BLOCK P - ------- January 2006 $ *** *** *** *** March 2006 $ *** *** *** *** April 2006 $ *** *** *** *** July 2006 $ *** *** *** *** October 2006 $ *** *** *** *** Continued Next Page... P.A. No. 1810 K/SWA SA-9 63 Attachment A to 6-1162-RLL-933R8 Page 3 2. Price Description. (Continued) 2.2 Price Adjustments For Option Aircraft Delivering From March 2003 through December 2009. 2.2.1 Special Features. The price for Special Features incorporated in the Option Aircraft Detail Specification will be adjusted to Boeing's then-current prices for such features as of the date of execution of the definitive agreement for the Option Aircraft. 2.2.2 Escalation Adjustments. For escalation provisions applicable to Option Aircraft delivering after 2002, see paragraph 2.2.6 below. 2.2.3 Base Price Adjustments for FAA Changes. The Aircraft Basic Price of the Option Aircraft will be adjusted for any FAA mandated changes incorporated into the Aircraft. 2.2.4 Price Adjustments for Changes. Boeing may adjust the Aircraft Basic Price and the Advance Payment Base Price for any changes mutually agreed upon subsequent to the date that Buyer and Boeing enter into a definitive agreement for the Option Aircraft. 2.2.5 Base Price Adjustments. The Aircraft Basic Price of the Option Aircraft will be adjusted to Boeing's then-current prices as of the date of execution of the definitive agreement for the Option Aircraft in accordance with the agreement reached below. The Aircraft Basic Price starting point for options delivering in 2003 is $ *** (July 1992 STE), for options delivering in 2004 is $ *** (July 1992 STE), for options delivering in 2005 through 2009 is $ *** (July 1992 STE). Such Aircraft Basic Price may increase in accordance with paragraphs 2.2.1, 2.2.2, 2.2.3 and 2.2.4. For any other changes to the Aircraft Basic Price, Boeing may increase the Aircraft Basic Price by a maximum of $ *** (July 1992 STE) for Aircraft delivering in 2005 and by a maximum of $ *** (July 1992 STE) per year or portion thereof starting in January 2006. 2.2.6 Prices for Long Lead Time Aircraft. Boeing has not established escalation provisions for Model 737-700 aircraft for delivery 2003 and after. Such escalation provisions (i) will be incorporated into the Option Aircraft definitive agreement when such information is available and (ii) will be the then-current escalation provisions applicable to the same model aircraft and engines delivering in the same time period as the Option Aircraft. The resulting revisions to the definitive agreement will P.A. No. 1810 K/SWA SA-9 64 Attachment A to 6-1162-RLL-933R8 Page 4 include but not be limited to, adjustment of the Aircraft Basic Price of the Option Aircraft, the Advance Payment Base Price, the Aircraft escalation provisions and the advance payment amounts due on the Option Aircraft. 2.2.7 BFE to SPE. An estimate of the total price for items of Buyer Furnished Equipment (BFE) changed to Seller Purchased Equipment (SPE) pursuant to the Configuration Specification is included in the Option Aircraft price build-up. The purchase price of the Option Aircraft will be adjusted by the price charged to Boeing for such items plus 10% of such price. If all BFE except developmental avionics is converted to SPE, Boeing will waive the 10% fee. 3. Advance Payment Schedules, Prices and Adjustments. 3.1 Buyer will pay to Boeing advance payments for the Option Aircraft on the dates and in the amounts determined below. P.A. No. 1810 K/SWA SA-9 65 Attachment A to 6-1162-RLL-933R8 Page 5 Amount Due per Aircraft (Percentage times Due Date of Payment Advance Payment Base Price) - ------------------- Deposit $100,000 (if applicable) 18 months prior to the first 15% (less the day of the scheduled delivery Deposit if any) month of the Aircraft 12 months prior to the first 5% day of the scheduled delivery month of the Aircraft 9 months prior to the first 5% day of the scheduled delivery month of the Aircraft 6 months prior to the first 5% day of the scheduled delivery month of the Aircraft --- Total 30% Any advance payments that would be past due as of the date of signing the definitive purchase agreement for the Option Aircraft in accordance with the above schedule are due and payable on such date. 3.2 Option Aircraft advance payment base prices will be increased or decreased, as appropriate, at the time of signing of the definitive purchase agreement for the Option Aircraft, using the then-current forecasted aircraft escalation factors used by Boeing, to determine the amount of the advance payments to be made by Buyer on the Option Aircraft. P.A. No. 1810 K/SWA SA-9 66 Attachment B to 6-1162-RLL-933R8 Page 1 PRICE ADJUSTMENT DUE TO ECONOMIC FLUCTUATIONS AIRCRAFT PRICE ADJUSTMENT (July 1992 Base Price) 1. Formula. The Aircraft Price Adjustment will be determined at the time of Aircraft delivery in accordance with the following formula: Pa = (P)(L + M - 1) Where: Pa = Aircraft Price Adjustment. L = .65 x ECI ----- 116.2 M = .35 x ICI ----- 115.9 P = Aircraft Basic Price (as set forth in Article 3.2 of this Agreement). ECI = A value using the "Employment Cost Index for workers in aerospace manufacturing" (aircraft manufacturing, standard industrial classification code 3721, compensation, base month and year June 1989 = 100), as released by the Bureau of Labor Statistics, U.S. Department of Labor on a quarterly basis for the months of March, June, September and December, calculated as follows: A three-month arithmetic average value (expressed as a decimal and rounded to the nearest tenth) will be determined using the months set forth in the table below for the applicable Aircraft, with the released Employment Cost Index value described above for the month of March also being used for the months of January and February; the value for June also used for April and May; the value for September also used for July and August; and the value for December also used for October and November. P.A. No. 1810 K/SWA SA-9 67 Attachment B to 6-1162-RLL-933R8 Page 3 2. If at the time of delivery of an Aircraft Boeing is unable to determine the Aircraft Price Adjustment because the applicable values to be used to determine the ECI and ICI have not been released by the Bureau of Labor Statistics, then: 2.1 The Aircraft Price Adjustment, to be used at the time of delivery of each of the Aircraft, will be determined by utilizing the escalation provisions set forth above. The values released by the Bureau of Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft delivery will be used to determine the ECI and ICI values for the applicable months (including those noted as preliminary by the Bureau of Labor Statistics) to calculate the Aircraft Price Adjustment. If no values have been released for an applicable month, the provisions set forth in Paragraph 2.2 below will apply. If prior to delivery of an Aircraft the U.S. Department of Labor changes the base year for determination of the ECI or ICI values as defined above, such rebased values will be incorporated in the Aircraft Price Adjustment calculation. The payment by Buyer to Boeing of the amount of the Purchase Price for such Aircraft, as determined at the time of Aircraft delivery, will be deemed to be the payment for such Aircraft required at the delivery thereof. 2.2 If prior to delivery of an Aircraft the U.S. Department of Labor substantially revises the methodology used for the determination of the values to be used to determine the ECI and ICI values (in contrast to benchmark adjustments or other corrections of previously released values), or for any reason has not released values needed to determine the applicable Aircraft Price Adjustment, the parties will, prior to delivery of any such Aircraft, select a substitute for such values from data published by the Bureau of Labor Statistics or other similar data reported by non-governmental United States organizations, such substitute to lead in application to the same adjustment result, insofar as possible, as would have been achieved by continuing the use of the original values as they may have fluctuated during the applicable time period. Appropriate revision of the formula will be made as required to reflect any substitute values. However, if within 24 months from delivery of the Aircraft the Bureau of Labor Statistics should resume releasing values for the months needed to determine the Aircraft Price Adjustment, such values will be used to determine any increase or decrease in the Aircraft Price Adjustment for the Aircraft from that determined at the time of delivery of such Aircraft. P.A. No. 1810 K/SWA SA-9 68 Attachment B to 6-1162-RLL-933R8 Page 4 2.3 In the event escalation provisions are made non-enforceable or otherwise rendered null and void by any agency of the United States Government, the parties agree, to the extent they may lawfully do so, to equitably adjust the Purchase Price of any affected Aircraft to reflect an allowance for increases or decreases in labor compensation and material costs occurring since February, 1992, which is consistent with the applicable provisions of paragraph 1 of this Exhibit D. 3. For the calculations herein, the values released by the Bureau of Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft delivery will be used to determine the ECI and ICI values for the applicable months (including those noted as preliminary by the Bureau of Labor Statistics) to calculate the Aircraft Price Adjustment. Note: Any rounding of a number, as required under this Exhibit D with respect to escalation of the airframe price, will be accomplished as follows: if the first digit of the portion to be dropped from the number to be rounded is five or greater, the preceding digit will be raised to the next higher number. 69 EXHIBIT 10.1 Supplemental Agreement No. 10 to Purchase Agreement No. 1810 between The Boeing Company and SOUTHWEST AIRLINES CO. Relating to Boeing Model 737-7H4 Aircraft THIS SUPPLEMENTAL AGREEMENT, entered into as of August 2, 1999, by and between THE BOEING COMPANY, a Delaware corporation with its principal offices in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas corporation with its principal offices in City of Dallas, State of Texas (Buyer); WHEREAS, the parties hereto entered into Purchase Agreement No. 1810 dated January 19, 1994, relating to Boeing Model 737-7H4 aircraft (the Agreement) and; WHEREAS, Buyer has agreed to accelerate one Block H Aircraft from April 2000 to March 2000; NOW THEREFORE, in consideration of the mutual covenants herein contained, the parties agree to amend the Agreement as follows: - -------------------------------------------------------------------------------- *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 SA-10-1 K/SWA 70 1. The Table of Contents of the Agreement is deleted in its entirety and a new Table of Contents is attached hereto and incorporated into the Agreement by this reference. 2. Article 2, entitled "Delivery, Title and Risk of Loss," paragraph 2.1, entitled "Time of Delivery," is deleted in its entirety and replaced by a new paragraph 2.1 revised to add one (1) Block H Aircraft delivering in March 2000 and to change the quantity of Block H Aircraft delivering in April 2000 from three (3) to two (2). Such new pages 2-1, 2-2 and 2-3 are attached hereto and incorporated into the Agreement by this reference. 3. Article 3, entitled "Price of Aircraft", paragraph 3.4 entitled "Advance Payment Base Price," subparagraph 3.4.1 entitled "Advance Payment Base Price" is revised by adding an Advance Payment Base Price for the Block H Aircraft delivering in March 2000. Such new pages 3-1, 3-2, 3-3 and 3-4 are attached hereto and incorporated into the Agreement by this reference. 4. All references in the Letter Agreements associated with Purchase Agreement No. 1810 shall be deemed to refer to the purchase by Buyer of one hundred forty-two (142) Model 737-7H4 Aircraft, sixty-two (62) Model 737-7H4 Option Aircraft and forty-six (46) Model 737-7H4 Rollover Option Aircraft, to the extent such reference is not specifically addressed herein. 5. Within three (3) business days of execution of this Supplemental Agreement, Boeing will refund to Buyer ***. Such amount reflects the difference in advance payments due as a result of the acceleration of one (1) Block H Aircraft from April 2000 to March 2000. The Agreement will be deemed to be supplemented to the extent herein provided and as so supplemented will continue in full force and effect. P.A. No. 1810 SA-10-2 K/SWA 71 EXECUTED IN DUPLICATE as of the day and year first above written. THE BOEING COMPANY SOUTHWEST AIRLINES CO. By: /s/ DAWN S. FOSTER By: /s/ LAURA WRIGHT ------------------------ ------------------ Its: ATTORNEY-IN-FACT ITS: TREASURER ----------------------- ----------------- P.A. No. 1810 SA-10-3 K/SWA 72 PURCHASE AGREEMENT between THE BOEING COMPANY and SOUTHWEST AIRLINES CO. Relating to Boeing Model 737-7H4 Aircraft Purchase Agreement Number 1810 - -------------------------------------------------------------------------------- *** PURSUANT TO 17 CFR, 240.246-2, CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A CONFIDENTIAL TREATMENT APPLICATION FILED WITH THE COMMISSION. P.A. No. 1810 15-1 K/SWA 73 TABLE OF CONTENTS Page SA Number Number ------ ------ ARTICLES 1. Subject Matter of Sale..........................................1-1 SA-9 2. Delivery, Title and Risk of Loss.........................................................2-1 SA-10 3. Price of Aircraft...............................................3-1 SA-10 4. Taxes...........................................................4-1 5. Payment.........................................................5-1 6. Excusable Delay.................................................6-1 7. Changes to the Detail Specification...................................................7-1 SA-1 8. Federal Aviation Requirements and Certificates and Export License.................................8-1 9. Representatives, Inspection, Flights and Test Data...........................................9-1 10. Assignment, Resale or Lease....................................10-1 11. Termination for Certain Events.................................11-1 12. Product Assurance; Disclaimer and Release; Exclusion of Liabilities; Customer Support; Indemnification and Insurance..................................................12-1 13. Buyer Furnished Equipment and Spare Parts....................................................13-1 14. Contractual Notices and Requests...............................14-1 15. Miscellaneous..................................................15-1 P.A. No. 1810 15-2 K/SWA 74 TABLE OF CONTENTS SA Number ------ EXHIBITS - -------- A Aircraft Configuration SA-1 B Product Assurance Document SA-1 C Customer Support Document D Price Adjustments Due to Economic Fluctuations - Aircraft E Buyer Furnished Equipment Provisions Document F Defined Terms Document LETTER AGREEMENTS 1810-1 Waiver of Aircraft Demonstration Flight P.A. No. 1810 15-3 K/SWA 75 TABLE OF CONTENTS SA Number ------ RESTRICTED LETTER AGREEMENTS - ---------------------------- 6-1162-RLL-932 Promotional Support 6-1162-RLL-933R8 Option Aircraft SA-9 6-1162-RLL-934R1 Disclosure of Confidential SA-1 Information 6-1162-RLL-935R1 Performance Guarantees SA-1 6-1162-RLL-936R4 Certain Contractual Matters SA-4 6-1162-RLL-937 Alternate Advance Payment Schedule 6-1162-RLL-938 *** 6-1162-RLL-939R1 Certification Flight Test Aircraft SA-1 6-1162-RLL-940R1 Training Matters SA-1 6-1162-RLL-941R1 Other Matters SA-1 6-1162-RLL-942 Open Configuration Matters 6-1162-RLL-943R1 Substitution Rights SA-6 6-1162-RLL-944 Airframe Maintenance Material Cost Protection Program 6-1162-RLL-945 Comparison of 737-7H4 and 737-3H4 Block Fuel Burn 6-1162-RLL-1855R3 Additional Contractual Matters SA-4 6-1162-RLL-1856 *** SA-1 6-1162-RLL-1857 Service Ready Validation Program SA-1 Field Test 6-1162-RLL-1858R1 Escalation Matters SA-4 P.A. No. 1810 15-4 K/SWA 76 TABLE OF CONTENTS CON'T SA Number ------ RESTRICTED LETTER AGREEMENTS - ---------------------------- 6-1162-RLL-2036 Amortization of Costs for Customer Unique Changes SA-1 6-1162-RLL-2037 Reconciliation of the Aircraft SA-1 Basic Price 6-1162-RLL-2073 Maintenance Training Matters SA-1 P.A. No. 1810 15-5 K/SWA 77 PURCHASE AGREEMENT NO. 1810 Relating to BOEING MODEL 737-7H4 AIRCRAFT ---------------------------- This Agreement is entered into as of January 19th 1994, by and between The Boeing Company, a Delaware corporation, with its principal office in Seattle, Washington (Boeing), and Southwest Airlines Co., a Texas corporation, with its principal office in the City of Dallas, State of Texas (Buyer). Accordingly, Boeing and Buyer agree as follows: P.A. No. 1810 15-6 K/SWA 78 ARTICLE 2. Delivery, Title and Risk of Loss. 2.1 Time of Delivery. The Aircraft will be delivered to Buyer by Boeing, assembled and ready for flight and Buyer will accept delivery of the Aircraft, in accordance with the following schedule: Month and Year of Delivery Quantity of Aircraft -------------- -------------------- Block A Aircraft ---------------- October 1997 Two (2) November 1997 Two (2) Block B Aircraft ---------------- January 1998 Two (2) February 1998 Three (3) March 1998 Two (2) April 1998 Two (2) May 1998 Two (2) June 1998 One (1) July 1998 Two (2) September 1998 Two (2) Block C Aircraft ---------------- February 1999 Four (4) May 1999 Four (4) July 1999 Four (4) August 1999 One (1) September 1999 Three (3) Block D Aircraft ---------------- November 1999 Two (2) December 1999 One (1) January 2000 One (1) March 2000 Four (4) July 2000 Four (4) September 2000 Three (3) Block E Aircraft ---------------- January 2001 Three (3) March 2001 Three (3) July 2001 Three (3) September 2001 Three (3) P.A. No. 1810 15-7 K/SWA 79 Block F Aircraft ---------------- October 1998 One (1) November 1998 Two (2) December 1998 Two (2) Block G Aircraft ---------------- March 1999 Two (2) Block H Aircraft ---------------- June 1999 Two (2) July 1999 One (1) August 1999 One (1) September 1999 Two (2) October 1999 One (1) March 2000 One (1) April 2000 Two (2) October 2000 Three (3) April 2001 Three (3) October 2001 Three (3) Block I Aircraft ---------------- January 2002 Four (4) March 2002 Four (4) April 2002 Two (2) July 2002 Four (4) October 2002 Four (4) Block J Aircraft ---------------- January 2003 Four (4) March 2003 One (1) Block K Aircraft ---------------- April 2004 Two (2) July 2004 Three (3) P.A. No. 1810 15-8 K/SWA 80 Block L Aircraft ---------------- October 1999 One (1) November 1999 Two (2) December 1999 One (1) June 2000 Three (3) July 2000 One (1) August 2000 Two (2) September 2000 One (1) October 2000 One (1) November 2000 Three (3) December 2000 Two (2) January 2001 One (1) February 2001 One (1) July 2001 One (1) September 2001 One (1) October 2001 One (1) September 2002 Three (3) 2.2 Notice of Target Delivery Date. Boeing will give Buyer notice of the Target Delivery Date of the Aircraft approximately 30 days prior to the scheduled month of delivery. 2.3 Notice of Delivery Date. If Boeing gives Buyer at least 7 days' notice of the delivery date of the Aircraft, and an Aircraft delivery is delayed beyond such delivery date due to the responsibility of Buyer, Buyer will reimburse Boeing for all costs incurred by Boeing as a result of such delay, including amounts for storage, insurance, Taxes, preservation or protection of the Aircraft and interest on payments due. 2.4 Place of Delivery. The Aircraft will be delivered at an airport facility selected by Boeing in the State of Washington, unless mutually agreed otherwise. 2.5 Title and Risk of Loss. Title to and risk of loss of an Aircraft will pass from Boeing to Buyer upon delivery of such Aircraft, but not prior thereto. 2.6 Bill of Sale. Upon delivery of an Aircraft Boeing will deliver to Buyer a bill of sale conveying good title to such Aircraft, free of all liens, claims, charges and encumbrances of every kind whatsoever, and such other appropriate documents of title as Buyer may reasonably request. P.A. No. 1810 15-9 K/SWA 81 ARTICLE 3. Price of Aircraft. 3.1 Definitions. 3.1.1 Special Features are the features incorporated in Exhibit A which have been selected by Buyer. 3.1.2 Base Aircraft Price is the Aircraft Basic Price excluding the price of Special Features. 3.1.3 Aircraft Basic Price is comprised of the Base Aircraft Price and the price of the Special Features. 3.1.4 Economic Price Adjustment is the adjustment to the Aircraft Basic Price (Base Aircraft and Special Features) as calculated pursuant to Exhibit D. 3.1.5 Aircraft Price is the total amount Buyer is to pay for the Aircraft at the time of delivery. 3.2 Aircraft Basic Price. The Aircraft Basic Price, expressed in July 1992 dollars, is set forth below: Base Special Aircraft Aircraft Price Features Basic Price -------------- -------- ----------- Block A, B, C, D & E Aircraft $*** $*** $*** Block F & G Aircraft $*** $*** $*** Block H Aircraft $*** $*** $*** Block I Aircraft $*** $*** $*** Block J Aircraft $*** $*** $*** Block K Aircraft $*** $*** $*** Block L Aircraft $*** $*** $*** 3.3 Aircraft Price. The Aircraft Price will be established at the time of delivery of such Aircraft to Buyer and will be the sum of: 3.3.1 the Aircraft Basic Price, which is ($***) for the Block A, B, C, D and E Aircraft, ($***) for the Block F and G Aircraft, ($***) for the Block H Aircraft, ($***) for the Block I Aircraft, ($***) for the Block J P.A. No. 1810 15-10 K/SWA 82 Aircraft, ($***) for the Block K Aircraft and ($***) for the Block L Aircraft; plus 3.3.2 the Economic Price Adjustments for the Aircraft Basic Price, as calculated pursuant to the formulas set forth in Exhibit D (Price Adjustments Due to Economic Fluctuations - Aircraft); plus 3.3.3 other price adjustments made pursuant to this Agreement or other written agreements executed by Boeing and Buyer. 3.4 Advance Payment Base Price. 3.4.1 Advance Payment Base Price. For advance payment purposes, the following estimated delivery prices of the Aircraft (Advance Payment Base Price) have been established, using currently available forecasts of the escalation factors used by Boeing as of the date of signing this Agreement. The Advance Payment Base Price of each Aircraft is set forth below: Month and Year of Advance Payment Base Scheduled Delivery Price per Aircraft ------------------ -------------------- Block A Aircraft ---------------- October 1997 $*** November 1997 $*** Block B Aircraft ---------------- January 1998 $*** February 1998 $*** March 1998 $*** April 1998 $*** May 1998 $*** June 1998 $*** July 1998 $*** September 1998 $*** P.A. No. 1810 15-11 K/SWA 83 Block C Aircraft ---------------- February 1999 $*** May 1999 $*** July 1999 $*** August 1999 $*** September 1999 $*** Block D Aircraft ---------------- November 1999 $*** December 1999 $*** January 2000 $*** March 2000 $*** July 2000 $*** September 2000 $*** Block E Aircraft ---------------- January 2001 $*** March 2001 $*** July 2001 $*** September 2001 $*** Block F Aircraft ---------------- October 1998 $*** November 1998 $*** December 1998 $*** Block G Aircraft ---------------- March 1999 $*** Block H Aircraft ---------------- June 1999 $*** July 1999 $*** August 1999 $*** September 1999 $*** October 1999 $*** March 2000 $*** April 2000 $*** October 2000 $*** April 2001 $*** October 2001 $*** P.A. No. 1810 15-12 K/SWA 84 Block I Aircraft ---------------- January 2002 $*** March 2002 $*** April 2002 $*** July 2002 $*** October 2002 $*** Block J Aircraft ---------------- January 2003 $*** March 2003 $*** Block K Aircraft ---------------- April 2004 $*** July 2004 $*** Block L Aircraft ---------------- October 1999 $*** November 1999 $*** December 1999 $*** June 2000 $*** July 2000 $*** August 2000 $*** September 2000 $*** October 2000 $*** November 2000 $*** December 2000 $*** January 2001 $*** February 2001 $*** July 2001 $*** September 2001 $*** October 2001 $*** September 2002 $*** P.A. No. 1810 15-13 K/SWA 85 3.4.2 Adjustment of Advance Payment Base Prices - Long-Lead Aircraft. For Aircraft scheduled for delivery 36 months or more after the date of this Agreement, the Advance Payment Base Prices appearing in Article 3.4.1 will be used to determine the amount of the first advance payment to be made by Buyer on the Aircraft. No later than 25 months before the scheduled month of delivery of each affected Aircraft, Boeing will increase or decrease the Advance Payment Base Price of such Aircraft as required to reflect the effects of (i) any adjustments in the Aircraft Basic Price pursuant to this Agreement and (ii) the then-current forecasted escalation factors used by Boeing. Boeing will provide the adjusted Advance Payment Base Prices for each affected Aircraft to Buyer, and the advance payment schedule will be considered amended to substitute such adjusted Advance Payment Base Prices. P.A. No. 1810 15-14 K/SWA