Supplemental Agreement No. 56

Exhibit 10.1
CONFIDENTIAL TREATMENT

Supplemental Agreement No. 56

to

Purchase Agreement No. 1810

between

THE BOEING COMPANY

and

SOUTHWEST AIRLINES CO.

Relating to Boeing Model 737-7H4 Aircraft (the Aircraft)

     THIS SUPPLEMENTAL AGREEMENT, entered into as of December 19, 2007, by and between THE BOEING COMPANY, a Delaware corporation with principal offices in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas corporation with principal offices in Dallas, 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 two (2) April 2009 Option Aircraft as Block T-W-2 Aircraft and;

     NOW THEREFORE, in consideration of the mutual covenants herein contained, the parties agree to amend the Agreement as follows:

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. Table 1 is deleted in its entirety and replaced by a new Table 1 which is attached hereto and is incorporated into the Agreement by this reference.

***Pursuant to 17 CFR 240.24b-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-56-1

3. Table 2 is deleted in its entirety and replaced by a new Table 2 which is attached hereto and is 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 four hundred two (402) Model 737-7H4 Aircraft, eighty-four (84) Model 737-7H4 Option Aircraft and fifty-four (54) Model 737-7H4 Purchase Right Aircraft, to the extent such reference is not specifically addressed herein.

5. The Advance Payment due upon signing assuming execution of this Supplemental Agreement on or before December 31, 2007 is:

***for two (2) April 2009 Block T-W-2 Aircraft

Buyer will pay the *** directly to Boeing on or before December 31, 2007.

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/ Nobuko Wiles				By:		/s/ Laura Wright
Its:		Attorney-In-Fact				Its:		SVP Finance & CFO

P.A. No. 1810 K/SWA		SA-56-2

TABLE OF CONTENTS

				Page		SA
				Number		Number
ARTICLES
1.		Subject Matter of Sale		1-1		SA-13
2.		Delivery, Title and Risk of Loss		2-1		SA-28
3.		Price of Aircraft		3-1		SA-47
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 K/SWA		i		SA-56

TABLE OF CONTENTS CON’T

				SA
				Number
TABLE
1.		Aircraft Information Table		SA-56
2.		Option Aircraft Information Table		SA-56
EXHIBITS
A		Aircraft Configuration		SA-47
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 K/SWA		ii		SA-56

TABLE OF CONTENTS CON’T

				SA
RESTRICTED LETTER AGREEMENTS				Number
6-1162-RLL-932R2		Promotional Support		SA-13
6-1162-RLL-933R20		Option Aircraft		SA-47
6-1162-RLL-934R3		Disclosure of Confidential Information		SA-14
6-1162-RLL-935R1		Performance Guarantees		SA-1
6-1162-NIW-890		***		SA-39
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-941R2		Other Matters		SA-13
6-1162-RLL-942		Open Configuration Matters
6-1162-RLL-943R1		Substitution Rights		SA-6
6-1162-RLL-944		***
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 Field Test		SA-1
6-1162-RLL-1858R1		Escalation Matters		SA-4

P.A. No. 1810 K/SWA		iii		SA-56

TABLE OF CONTENTS CON’T

				SA
RESTRICTED LETTER AGREEMENTS				Number
6-1162-RLL-2036		Amortization of Costs for Customer Unique Changes		SA-1
6-1162-RLL-2037		Reconciliation of the Aircraft Basic Price		SA-1
6-1162-RLL-2073		Maintenance Training Matters		SA-1
6-1162-KJJ-054R1		Business Matters
6-1162-KJJ-055R1		Structural Matters		SA-25
6-1162-KJJ-056		Noise and Emission Matters		SA-13
6-1162-KJJ-057		Product Development Matters		SA-13
6-1162-KJJ-058		Additional Substitution Rights		SA-13
6-1162-KJJ-150		Flight Control Computer & Mode Control Panel Spares Matter		SA-14
6-1162-MSA-185R3		Delivery Change Contractual Matters		SA-21
6-1162-JMG-669R8		***		SA-54
6-1162-JMG-747R1		***		SA-36
6-1162-CHL-217		Rescheduled Flight Test Aircraft		SA-32
6-1162-NIW-606R1		***		SA-36
6-1162-NIW-640		Early Delivery of Two April 2004 Aircraft		SA-35
6-1162-NIW-889		Warranty — Exterior Color Schemes and Markings for YA143 and on		SA-39
6-1162-NIW-1142		***		SA-43
6-1162-NIW-1369		***		SA-46

P.A. No. 1810 K/SWA		iv		SA-56

Table 1 to
Purchase Agreement No. 1810
Aircraft Information Table

Base Aircraft

Special

Aircraft Basic

Base Year

Price

Features

Price

Dollars

Block A, B, C, D & E Aircraft

*

**

*

**

*

**

July 1992

Block F & G Aircraft

*

**

*

**

*

**

July 1992

Block H Aircraft

*

**

*

**

*

**

July 1992

Block I Aircraft

*

**

*

**

*

**

July 1992

Block J Aircraft

*

**

*

**

*

**

July 1992

Block K Aircraft

*

**

*

**

*

**

July 1992

Block K-W Aircraft

*

**

*

**

*

**

July 1992

Block L Aircraft

*

**

*

**

*

**

July 1992

Block T Aircraft

*

**

*

**

*

**

July 1999

Block T-W Aircraft

*

**

*

**

*

**

July 1999

Block T-W-1 / T-W-1a Aircraft

*

**

*

**

*

**

July 1999

Block T-W-2 / T-W-2a Aircraft

*

**

*

**

*

**

July 1999

Block K-W Aircraft: Block K airplanes with production winglets installation

Block T-W Aircraft: Block T airplanes with production winglets installation

Block T-W-1 / T-W-1a Aircraft: Firm Aircraft contracted to deliver from May 1, 2006 through June 2008 at the signing of SA-47 — (T-W-1a Aircraft — Advance Payment Schedule per LA 6-1162-JGM-669)

Block T-W-2 / T-W-2a Aircraft: U-W-1 Option Aircraft which became Firm Aircraft after signing of SA-47 and

Firm Aircraft contracted to deliver in July 2008 forward at the signing of SA47 —

(T-W-2a Aircraft — Advance Payment Schedule per LA 6-1162-JGM-669)

SWA		Page 1		SA-56

Table 1 to
Purchase Agreement No. 1810
Aircraft Information Table

						Escalation Estimate
Delivery		Number of		Aircraft		Adv Payment Base
Date		Aircraft		Block		Price Per A/P		Serial Number
Dec-2000		2		E		***
Jan-2001		1		E		***
Feb-2001		1		E		***
Mar-2001		2		E		***
Jun-2001		3		E		***
Sep-2001		3		E		***
Oct-1998		1		F		***
Nov-1998		2		F		***
Dec-1998		2		F		***
Mar-1999		2		G		***
Jun-1999		2		H		***
Jul-1999		1		H		***
Aug-1999		1		H		***
Sep-1999		2		H		***
Oct-1999		1		H		***
Mar-2000		1		H		***
Apr-2000		2		H		***
Sep-2000		1		H		***
Oct-2000		2		H		***
Mar-2001		2		H		***
Apr-2001		1		H		***
Oct-2001		3		H		***
Nov-2001		2		I		***
Dec-2001		1		I		***
Jan-2002		1		I		***
Mar-2002		4		I		***
Apr-2002		2		I		***
Dec-2002		2		I		***
May-2003		1		I		***
Jun-2003		2		I		***
Jul-2003		1		I		***
Aug-2003		1		I		***
Sep-2003		3		I		***
Nov-2002		1		J		***
Dec-2002		1		J		***
Nov-2003		2		J		***
Dec-2003		2		J		***
Mar-2004		1		J		***
Mar-2004		1		K		***
Apr-2004		3		K		***
May-2004		1		K		***
Jun-2004		2		K		***
Jul-2004		2		K		***

Table 1 to
Purchase Agreement No. 1810
Aircraft Information Table

						Escalation Estimate
Delivery		Number of		Aircraft		Adv Payment Base
Date		Aircraft		Block		Price Per A/P		Serial Number
Sep-2004		1		K-W		***
Oct-2004		4		K-W		***
Oct-1999		1		L		***
Nov-1999		2		L		***
Dec-1999		1		L		***
Jun-2000		3		L		***
Jul-2000		3		L		***
Sep-2000		1		L		***
Oct-2000		1		L		***
Nov-2000		4		L		***
Dec-2000		1		L		***
Jan-2001		1		L		***
Feb-2001		1		L		***
Jul-2001		1		L		***
Sep-2001		1		L		***
Oct-2001		1		L		***
Mar-2003		2		L		***
Jul-2003		1		L		***
Aug-2003		2		L		***
Nov-2001		1		T		***
Feb-2002		1		T		***
Jan-2004		2		T		***
Feb-2004		1		T		***
Apr-2004		3		T		***
May-2004		1		T		***
Jun-2004		6		T		***
Jul-2004		2		T		***
Aug-2004		6		T-W		***
Sep-2004		4		T-W		***
Oct-2004		0		T-W		***
Nov-2004		3		T-W		***
Dec-2004		3		T-W		***
Jan-2005		5		T-W		***
Feb-2005		3		T-W		***
Mar-2005		4		T-W		***
Apr-2005		4		T-W		***
May-2005		2		T-W		***
Jun-2005		4		T-W		***
Jul-2005		2		T-W		***
Aug-2005		2		T-W		***
Sep-2005		3		T-W		***
Oct-2005		2		T-W		***
Nov-2005		2		T-W		***
Dec-2005		1		T-W		***
Jan-2006		1		T-W		***
Feb-2006		4		T-W		***
Mar-2006		3		T-W		***

Table 1 to
Purchase Agreement No. 1810
Aircraft Information Table

						Escalation Estimate
Delivery		Number of		Aircraft		Adv Payment Base
Date		Aircraft		Block		Price Per A/P		Serial Number
Apr-2006		2		T-W		***
May-2006		5		T-W-1		***
Jun-2006		5		T-W-1		***
Jul-2006		3		T-W-1		***
Aug-2006		3		T-W-1		***
Sep-2006		3		T-W-1		***
Oct-2006		1		T-W-1		***
Nov-2006		2		T-W-1		***
Dec-2006		2		T-W-1		***
Jan-2007		2		T-W-1		***
Feb-2007		3		T-W-1		***
Mar-2007		2		T-W-1		***
Apr-2007		3		T-W-1		***
May-2007		3		T-W-1		***
Jun-2007		2		T-W-1		***
Jun-2007		1		T-W-1a		***		36528
Jul-2007		2		T-W-1		***
Jul-2007		1		T-W-1a		***		36610
Aug-2007		2		T-W-1		***
Aug-2007		3		T-W-1a		***		36611, 36632 & 36633
Sep-2007		2		T-W-1		***
Sep-2007		1		T-W-1a		***		36612
Oct-2007		3		T-W-1		***
Oct-2007		1		T-W-1a		***		36613
Nov-2007		1		T-W-1		***
Nov-2007		1		T-W-1a		***		36614
Dec-2007		2		T-W-1		***
Dec-2007		1		T-W-1a		***		36615
Jan-2008		1		T-W-1		***
Jan-2008		2		T-W-1a		***		36616 & 36617
Jan-2008		1		T-W-2		***		36887
Feb-2008		1		T-W-1		***
Feb-2008		3		T-W-1a		***		36618, 36619 & 36620
Mar-2008		1		T-W-1		***
Mar-2008		2		T-W-1a		***		36621 & 36622
Mar-2008		1		T-W-2		***		36888
Apr-2008		1		T-W-1		***
Apr-2008		2		T-W-1a		***		36623 & 36624
May-2008		1		T-W-1		***
May-2008		2		T-W-1a		***		36625 & 36626
Jun-2008		1		T-W-1		***
Jun-2008		2		T-W-1a		***		36627 & 36628
Jul-2008		2		T-W-2a		***
Jul-2008		2		T-W-2		***		36889 & 36890
Aug-2008		1		T-W-2a		***
Oct-2008		1		T-W-2a		***

Table 1 to
Purchase Agreement No. 1810
Aircraft Information Table

						Escalation Estimate
Delivery		Number of		Aircraft		Adv Payment Base
Date		Aircraft		Block		Price Per A/P		Serial Number
Nov-2008		1		T-W-2a		***
Dec-2008		1		T-W-2a		***
Jan-2009		1		T-W-2a		***
Feb-2009		2		T-W-2a		***
Mar-2009		2		T-W-2a		***
Apr 2009		2		T-W-2a		***
Apr-2009		2		T-W-2a		***		36899 & 36900
May-2009		2		T-W-2a		***
Jun-2009		2		T-W-2a		***
Jul-2009		2		T-W-2a		***
Aug-2009		1		T-W-2a		***
Sep-2009		1		T-W-2a		***
Oct-2009		1		T-W-2a		***
Nov-2009		1		T-W-2a		***
Dec-2009		1		T-W-2a		***
Jan-2010		1		T-W-2a		***
Feb-2010		1		T-W-2a		***
Mar-2010		1		T-W-2a		***
Apr-2010		1		T-W-2a		***
May-2010		1		T-W-2a		***
Jun-2010		1		T-W-2a		***
Jul-2010		1		T-W-2a		***
Aug-2010		1		T-W-2a		***
Sep-2010		1		T-W-2a		***
Oct-2010		1		T-W-2a		***
Jan-2011		1		T-W-2a		***
Feb-2011		1		T-W-2a		***
Mar-2011		1		T-W-2a		***
Apr-2011		1		T-W-2a		***
May-2011		1		T-W-2a		***
Jun-2011		1		T-W-2a		***
Jul-2011		1		T-W-2a		***
Aug-2011		1		T-W-2a		***
Sep-2011		1		T-W-2a		***
Oct-2011		1		T-W-2a		***
Jan-2012		1		T-W-2a		***
Feb-2012		1		T-W-2a		***
Mar-2012		1		T-W-2a		***
Apr-2012		1		T-W-2a		***
May-2012		1		T-W-2a		***
Jun-2012		1		T-W-2a		***
Jul-2012		1		T-W-2a		***
Aug-2012		1		T-W-2a		***
Sep-2012		1		T-W-2a		***
Oct-2012		1		T-W-2a		***
Jan-2013		1		T-W-2		***		36891

Table 1 to
Purchase Agreement No. 1810
Aircraft Information Table

						Escalation Estimate
Delivery		Number of		Aircraft		Adv Payment Base
Date		Aircraft		Block		Price Per A/P		Serial Number
Jan-2013		1		T-W-2a		***
Feb-2013		1		T-W-2a		***
Mar-2013		1		T-W-2a		***
Mar-2013		1		T-W-2		***
Apr-2013		1		T-W-2		***
May-2013		1		T-W-2		***
Jun-2013		2		T-W-2		***
Jul-2013		1		T-W-2		***
Aug-2013		2		T-W-2		***
Sep-2013		2		T-W-2		***
Oct-2013		2		T-W-2		***
Nov-2013		1		T-W-2		***
Dec-2013		2		T-W-2		***
Jan-2014		1		T-W-2		***
Feb-2014		1		T-W-2		***
Mar-2014		1		T-W-2		***
Apr-2014		1		T-W-2		***
May-2014		1		T-W-2		***
Jun-2014		1		T-W-2		***
Jul-2014		1		T-W-2		***
Aug-2014		1		T-W-2		***
Sep-2014		1		T-W-2		***
Oct-2014		1		T-W-2		***

Table 2 to Purchase Agreement No. 1810
(Letter Agreement No. 6-1162-RLL-933R20)
Option Aircraft Information Table

Price Description of Option Aircraft:

Base Aircraft

Special

Aircraft Basic

Base Year

Price

Features

Price

Dollars

Block U Option Aircraft (without Winglets)

*

**

*

**

*

**

July 1999

Block U-W Option Aircraft (with Winglets)

*

**

*

**

*

**

July 1999

Block U-W-1 Option Aircraft

*

**

*

**

*

**

July 1999

Delivery of Purchase Right Aircraft:		Quantity               54
Delivery Period of Purchase Right Aircraft:		Complete delivery not later than Dec. 31, 2014
Condition of Offer for Purchase Right Aircraft:		Subject to Available Position
Remaining Option Aircraft:		84

SWA		Page 1		SA-56

Table 2 to Purchase Agreement No. 1810
(Letter Agreement No. 6-1162-RLL-933R20)
Option Aircraft Information Table

Aircraft		Number of				Option		Adv Payment Base
Delivery		Option				Aircraft		Price Per
Mo. & Yr.		Aircraft				Block		Option Aircraft		Option Exercise
May-2009			1			U-W-1		***		January 1, 2008
Jun-2009			1			U-W-1		***		February 1, 2008
Jul-2009			2			U-W-1		***		March 3, 2008
Aug-2009			1			U-W-1		***		April 1, 2008
Oct-2009			1			U-W-1		***		June 2, 2008
Nov-2009			1			U-W-1		***		July 1, 2008
Dec-2009			1			U-W-1		***		August 1, 2008
Jan-2010			1			U-W-1		***		September 1, 2008
Feb-2010			1			U-W-1		***		October 1, 2008
Mar-2010			1			U-W-1		***		November 3, 2008
Apr-2010			1			U-W-1		***		December 1, 2008
May-2010			2			U-W-1		***		January 1, 2009
Jun-2010			3			U-W-1		***		February 2, 2009
Jul-2010			2			U-W-1		***		March 2, 2009
Aug-2010			2			U-W-1		***		April 1, 2009
Sep-2010			2			U-W-1		***		May 1, 2009
Oct-2010			3			U-W-1		***		June 1, 2009
Nov-2010			3			U-W-1		***		July 1, 2009
Dec-2010			3			U-W-1		***		August 3, 2009
Jan-2011			1			U-W-1		***		September 1, 2009
Feb-2011			2			U-W-1		***		October 1, 2009
Mar-2011			1			U-W-1		***		November 2, 2009
Apr-2011			1			U-W-1		***		December 1, 2009
May-2011			2			U-W-1		***		January 1, 2010
Jun-2011			2			U-W-1		***		February 1, 2010
Jul-2011			2			U-W-1		***		March 1, 2010
Aug-2011			2			U-W-1		***		April 1, 2010
Sep-2011			2			U-W-1		***		May 3, 2010
Oct-2011			2			U-W-1		***		June 1, 2010
Nov-2011			3			U-W-1		***		July 1, 2010
Dec-2011			2			U-W-1		***		August 2, 2010
Jan-2012			3			U-W-1		***		September 1, 2010
Feb-2012			3			U-W-1		***		October 1, 2010
Mar-2012			2			U-W-1		***		November 1, 2010
Apr-2012			3			U-W-1		***		December 1, 2010
May-2012			3			U-W-1		***		January 3, 2011
Jun-2012			3			U-W-1		***		February 1, 2011
Jul-2012			2			U-W-1		***		March 1, 2011
Aug-2012			2			U-W-1		***		April 1, 2011
Sep-2012			2			U-W-1		***		May 2, 2011
Oct-2012			2			U-W-1		***		June 1, 2011
Nov-2012			3			U-W-1		***		July 1, 2011
Dec-2012			2			U-W-1		***		August 1, 2011
Total			84

SWA		Page 2		SA-56