Table of Contents NOTES TO CONSOLIDATED FINANCIAL STATEMENTS OF AMERICAN AIRLINES, INC. Restricted Stock Unit Awards (RSUs) 14. Valuation and Qualifying Accounts (in millions) 197 As of December 31, 2020, there was $107 million of unrecognized compensation cost related to RSUs. These costs are expected to be recognized over a weighted average period of one year. The total fair value of RSUs vested during the years ended December 31, 2020, 2019 and 2018 was $51 million, $68 million and $91 million, respectively. RSU award activity for all plans for the years ended December 31, 2020, 2019 and 2018 is as follows: The majority of American’s RSUs have service conditions (time vested primarily over three years). The grant-date fair value of these RSUs is equal to the market price of the underlying shares of AAG common stock on the date of grant. The expense for these RSUs is recognized on a straight-line basis over the vesting period for the entire award. RSUs are classified as equity awards as the vesting results in the issuance of shares of AAG common stock. Number of Shares Weighted Average Grant Date Fair Value (In thousands) Outstanding at December 31, 2017 4,324  $ 46.94  Granted 2,194  47.65  Vested and released (1,999) 44.99  Forfeited (199) 45.72  Outstanding at December 31, 2018 4,320  $ 44.29  Granted 3,206  34.00  Vested and released (2,002) 44.90  Forfeited (337) 42.55  Outstanding at December 31, 2019 5,187  $ 37.01  Granted 5,883  22.07  Vested and released (2,268) 39.46  Forfeited (920) 29.78  Outstanding at December 31, 2020 7,882  $ 23.66  Balance at Beginning of Year Additions Charged to Statement of Operations Accounts Deductions Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2020 $ 729  $ 81  $ (368) $ 442  Year ended December 31, 2019 754  79  (104) 729  Year ended December 31, 2018 717  57  (20) 754  Allowance for credit losses on accounts receivable Year ended December 31, 2020 $ 25  $ 25  $ (21) $ 29  Year ended December 31, 2019 24  17  (16) 25  Year ended December 31, 2018 21  39  (36) 24 