Exhibit 10.19 July 12, 1996 6-1162-RCN-870R4 United Air Lines, Inc. Executive Offices P. 0. Box 66100 Chicago, IL 60666-0100 Attention: J. L. Pollock Sr. Staff Representative Aircraft Purchasing Subject: [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]Letter Agreement No. 6-1162-TML-1205 Reference: Letter Agreement No. 6-1162-TML-1205, dated April 28, 1993; [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] Dear Jerry: [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] 1. The following Supplemental Agreements contain either [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT](as defined in the referenced Letter Agreement). Supplemental Agreement No. 5 to P.A. 1670 Supplemental Agreement No. 5 to P.A. 1485 Supplemental Agreement No. 6 to P.A. 1670 Supplemental Agreement No. 11 to P.A. 1602 Supplemental Agreement No. 7 to P.A. 1670 Supplemental Agreement No. 8 to P.A. 1670 Supplemental Agreement No. 4 to P.A. 1663 Supplemental Agreement No. 6 to P.A. 1485 Supplemental Agreement No. 9 to P.A. 1670 Supplemental Agreement No. 7 to P.A. 1485 Supplemental Agreement No. 5 to P.A. 1663 The execution of these Supplemental Agreements [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] under Letter Agreement No. 6-1162-TML-1205 and any balance excess or shortfall pursuant to Paragraph 6 herein, shall be applied against paragraph 1.3.1.3 of Letter Agreement No. 6- 1162-MDH-150. The accounting given below is for the effect of the above Supplemental Agreements with respect to the matters discussed in the Reference Letter. 2. A total of [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]pursuant to paragraph no. 4 of the reference Letter Agreement. The status of these [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]is given below. [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] United Air Lines, Inc. 6-1162-RCN-870R4 [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] United Air Lines, Inc. 6-1162-RCN-870R4 [*CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] United Air Lines, Inc. 6-1162-RCN-870R4 8. This letter is subject to the confidentiality provisions of Letter Agreement 6-1162-GKW-132 for Purchase Agreement 1485, Letter Agreement 6-1162-GKW-653 for Purchase Agreement 1595, Letter Agreement 6-1162-DLJ-886 for Purchase Agreement 1670, Letter Agreement 6-1162-DLJ-467 for Purchase Agreement 1602, and Letter Agreement 6-1162-DLJ-832 for Purchase Agreement 1663. If the foregoing correctly sets forth your understanding of our agreement with respect to the matters addressed above, please indicate your acceptance and approval below. Very truly yours, THE BOEING COMPANY By /s/ M. O. Hunt -------------- Its Attorney in Fact ---------------- ACCEPTED AND AGREED TO this Date: July 12, 1996 UNITED AIRLINES, INC. By /s/ J. L. Pollock ----------------- Its Sr. Staff Specialist -------------------- Aircraft Purchasing -------------------