exhibit 10. 159m 6 - 1162 - akp - 109r3 american airlines, inc. p. o. box 619616 dallas - fort worth airport, texas # # # - # # # - # # # # subject : business considerations reference : purchase agreement no. 1980 between the boeing company and american airlines, inc. relating to model 777 aircraft this letter agreement ( letter agreement ) is entered into on the date below and amends and supplements the purchase agreement referenced above. all capitalized terms used herein but not otherwise defined in this letter agreement shall have the same meanings assigned thereto in exhibit c to the purchase agreement or elsewhere in such purchase agreement. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. 1. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. 2. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. p. a. no. 1980 sa no. 20 exhibit 10. 159m 6 - 1162 - akp - 109r3 american airlines, inc. p. o. box 619616 dallas - fort worth airport, texas # # # - # # # - # # # # subject : business considerations reference : purchase agreement no. 1980 between the boeing company and american airlines, inc. relating to model 777 aircraft subject : reference : this letter agreement ( letter agreement ) is entered into on the date below and amends and supplements the purchase agreement referenced above. all capitalized terms used herein but not otherwise defined in this letter agreement shall have the same meanings assigned thereto in exhibit c to the purchase agreement or elsewhere in such purchase agreement. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. 1. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. 2. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. [ confidential portion omitted and filed separately with the commission pursuant to a request for confidential treatment ]. p. a. no. 1980 sa no