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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Current Assets:
Allowance for uncollectible accounts	$ 18	$ 18
Allowance for obsolescence	128	120
Noncurrent Assets:
Accumulated depreciation and amortization	23,708	23,228
Accumulated amortization	$ 922	$ 919
Stockholders' Equity:
Common stock, par value (USD per share)	$ 0.0001	$ 0.0001
Common stock, authorized (shares)	1,500,000,000	1,500,000,000
Common stock, issued (shares)	659,478,443	654,571,606
Treasury stock, at cost (shares)	6,523,274	8,098,971

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The amount of the valuation account as of the balance sheet date which reduces the carrying amount of airline related inventory (including expendable merchandise, goods, commodities, or supplies to be used primarily in air transport of passengers or freight) to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.

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