WORLDWIDE PANDEMIC	3 Months Ended
WORLDWIDE PANDEMIC	Mar. 31, 2021
Worldwide Pandemic [Abstract]
Worldwide Pandemic	WORLDWIDE PANDEMIC As a result of the rapid spread of the novel coronavirus, COVID-19, throughout the world, including into the United States, on March 11, 2020, the World Health Organization classified the virus as a pandemic. The speed with which the effects of the COVID-19 pandemic changed the U.S. economic landscape, outlook, and in particular the travel industry, was swift and unexpected. The Company saw a negative impact on bookings for future travel throughout 2020. The Company proactively canceled a significant portion of its scheduled flights in March 2020 and continued adjusting capacity throughout 2020, as the Company grounded a significant portion of its fleet and operated a significantly reduced portion of its previously scheduled capacity. The Company continued to experience significant negative impacts to passenger demand and bookings through first quarter 2021 due to the pandemic. In April 2020, the Company entered into definitive documentation with the United States Department of Treasury ("Treasury") with respect to funding support pursuant to the Payroll Support Program ("Payroll Support") under the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act"). During 2020, the Company received a total of $3.4 billion of relief funds under the CARES Act. As consideration for the Payroll Support, the Company issued a promissory note in favor of Treasury and entered into a warrant agreement with Treasury, pursuant to which the Company agreed to issue warrants to purchase common stock of the Company to Treasury. During 2020, the Company provided the promissory note in the aggregate amount of $976 million and issued warrants valued at a total of $40 million to purchase up to an aggregate of 2.7 million shares of the Company's common stock, subject to adjustment pursuant to the terms of the warrants. Payroll Support funds were used solely to pay qualifying employee salaries, wages, and benefits. On January 15, 2021, the Company entered into definitive documentation with Treasury with respect to funding support under the Consolidated Appropriations Act, 2021 (the "Payroll Support Program Extension"). Payroll Support Program Extension funds were used solely to pay qualifying employee wages and benefits. As of March 31, 2021, the Company had received $1.7 billion associated with the Payroll Support Program Extension. As consideration for the Payroll Support Program Extension, the Company issued a promissory note (the "PSP2 Note") in favor of Treasury and entered into a warrant agreement (the "PSP2 Warrant Agreement") with Treasury pursuant to which the Company agreed to issue warrants (each, a "PSP2 Warrant") to purchase common stock of the Company to Treasury. As of March 31, 2021, the Company had provided a PSP2 Note in the aggregate amount of $488 million and issued PSP2 Warrants valued at a total of $23 million to purchase up to an aggregate of 1.1 million shares of the Company's common stock, subject to adjustment pursuant to the terms of the PSP2 Warrants. Pursuant to the terms of the Payroll Support Program Extension, the payroll support funds could only be utilized to pay qualifying salaries, wages, and benefits, as defined. As of March 31, 2021, excluding the $488 million PSP2 Note and value allocated to the PSP2 Warrants, all Payroll Support Program Extension funds received had been allocated to reduce eligible costs in the accompanying unaudited Condensed Consolidated Statement of Comprehensive Income (Loss) for the three months ended March 31, 2021. On April 23, 2021, the Company received an additional $259 million related to the Payroll Support Program Extension, for which the Company provided Treasury consideration in the form of an increase of the PSP2 Note in an amount of $78 million and a PSP2 Warrant to purchase up to 168 thousand shares of the Company's common stock under the PSP2 Warrant Agreement. The grant portion of the payroll support funds will be allocated to reduce qualifying employee salaries, wages, and benefits during second quarter 2021. After taking into account the additional support under the Payroll Support Program Extension, the Company has received $2.0 billion of payroll support under the Payroll Support Program Extension, for which the Company has provided Treasury with a PSP2 Note in the aggregate amount of $566 million and PSP2 Warrants to purchase up to 1.2 million shares of the Company's common stock. The PSP2 Note matures in full on January 15, 2031, and is subject to mandatory prepayment requirements in connection with certain change of control triggering events that may occur prior to its maturity. The Company has an option to prepay the PSP2 Note at any time without premium or penalty. Amounts outstanding under the PSP2 Note bear interest at a rate of 1.00 percent before January 15, 2026, and, afterwards, at a rate equal to the Secured Overnight Financing Rate or other benchmark replacement rate consistent with customary market conventions plus a margin of 2.00 percent. The PSP2 Note contains customary representations and warranties and events of default. Also under the terms of the Payroll Support (discussed above) and Payroll Support Program Extension, the Company is prohibited from repurchasing its common stock and from paying dividends with respect to its common stock through March 31, 2022. The PSP2 Warrant Agreement sets out the Company’s obligations to issue PSP2 Warrants in connection with disbursements of funding support pursuant to the Payroll Support Program Extension and to file or designate a resale shelf registration statement for the PSP2 Warrants and the underlying shares of common stock. The Company has also granted Treasury certain demand underwritten offering and piggyback registration rights with respect to the PSP2 Warrants and the underlying common stock. Each PSP2 Warrant is exercisable at a strike price of $46.28 per share of common stock and will expire on the fifth anniversary of the issue date of such PSP2 Warrant. The PSP2 Warrants will be settled through net share settlement or net cash settlement, at the Company’s option. The PSP2 Warrants include adjustments for below market issuances, payment of dividends, and other customary anti-dilution provisions. The PSP2 Warrants do not have voting rights. On March 11, 2021, President Biden signed into law the American Rescue Plan Act of 2021, which includes provisions for an expected $14 billion of further payroll support ("PSP3 Payroll Support") for eligible U.S. airlines (the "PSP3 Payroll Support Program"). On April 23, 2021, the Company finalized an agreement with Treasury in which the Company is expected to receive an aggregate of approximately $1.9 billion in PSP3 Payroll Support funds that will be used to pay qualifying employee salaries, wages, and benefits through at least September 30, 2021. The Company received an initial installment of $926 million on April 23, 2021, and expects to receive the remainder of PSP3 Payroll Support funds during second quarter 2021. As consideration for the PSP3 Payroll Support, on April 23, 2021, the Company issued a promissory note (the "PSP3 Note") in favor of Treasury and entered into a warrant agreement with Treasury (the "PSP3 Warrant Agreement"), pursuant to which the Company agreed to issue warrants (each, a "PSP3 Warrant") to purchase common stock of the Company to Treasury. The PSP3 Note was issued for $248 million and the Company issued a PSP3 Warrant valued at a total of $9 million to purchase up to an aggregate of 424 thousand shares of the Company's common stock, subject to adjustment pursuant to the terms of the PSP3 Warrant. Upon each subsequent disbursement of PSP3 Payroll Support to the Company after April 23, 2021, (i) the principal amount of the PSP3 Note will automatically be increased in an amount equal to 30 percent of any such disbursement and (ii) the Company will issue an additional PSP3 Warrant to Treasury in an amount equal to 10 percent of the principal amount of the increase to the PSP3 Note in connection with such disbursement of PSP3 Payroll Support, divided by the strike price of $58.51 (which was the closing price of the Company's common stock on March 10, 2021). The PSP3 Payroll Support funds received can only be utilized to pay qualifying salaries, wages, and benefits, as defined. Excluding the amounts allocated to the PSP3 Note and value allocated to the PSP3 Warrants, all PSP3 Payroll Support funds received are expected to be allocated to reduce eligible costs in the year ended December 31, 2021. The Company currently expects the grant portion of the direct payroll support of $1.3 billion will be classified as a contra-expense line item in the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss). On June 1, 2020, the Company announced Voluntary Separation Program 2020, a voluntary separation program that allowed eligible Employees the opportunity to voluntarily separate from the Company in exchange for severance, medical/dental coverage for a specified period of time, and travel privileges based on years of service. Virtually all of the Company’s Employees hired before June 1, 2020 were eligible to participate in Voluntary Separation Program 2020. In conjunction with Voluntary Separation Program 2020, the Company also offered certain contract Employees the option to take voluntary Extended Emergency Time Off ("Extended ETO"), for periods between six and 18 months, with the exception of Pilots, who could elect to take Extended ETO for periods up to five years. Approximately 11,000 Employees participated in the Extended ETO program, and 8,164 Employees remained on Extended ETO leave as of March 31, 2021. Employees taking Extended ETO do not perform any work for the Company and are considered inactive while on leave, but do get paid a portion of their wages and continue to receive all associated benefits, as well as accrue service credit for all benefits. Contract employees who elected to take Extended ETO for periods between 12 and 18 months and had 10 or more years of service were given the opportunity to convert to the Voluntary Separation Program 2020 beginning on September 1, 2020, until up to 90 days before the end of their respective Extended ETO term. The purpose of Voluntary Separation Program 2020 and Extended ETO is to maintain a reduced workforce to operate at reduced capacity relative to the Company's operations prior to the COVID-19 pandemic. In accordance with the accounting guidance in ASC Topic 712 (Compensation — Nonretirement Postemployment Benefits), the Company accrued charges related to the special termination benefits described above upon Employees accepting Voluntary Separation Program 2020 or Extended ETO offers, which have been reduced as program benefits are paid. During first quarter 2021, the Company determined that it was no longer probable that a portion of the Employees remaining on Extended ETO would remain on such leave for their entire elected term. Therefore, a portion of the accruals previously recorded were reversed, resulting in a $141 million credit to expense. In addition, the Company continues to be subject to overstaffing levels in certain workgroups and locations, and offered some of the Employees on Extended ETO the opportunity to extend their leave periods by one, two, or three months. Based on the acceptances received, the Company accrued an additional $26 million in expense associated with the program. Both of these items are classified within Payroll support and voluntary Employee programs, net, in the accompanying unaudited Condensed Consolidated Statement of Comprehensive Income (Loss), and are in addition to the allocation of the Payroll Support Program Extension funds utilized to fund salaries, wages, and benefits, which totaled $1.2 billion during first quarter 2021. The Company accrued expense totaling $620 million for its Extended ETO program in 2020, and considering the adjustments described above, as well as payments subsequently made, $190 million remains accrued as of March 31, 2021. The balance consists of future wages and benefits for the Employees that will not be working during their leave. The Company accrued amounts for up to the first 18 months from inception for all Employees that elected Extended ETO, but did not include amounts related to Pilots for periods beyond February 2022, based on the uncertainty of the Company's future capacity levels, and because it is not currently probable that such Employees will not be recalled to work beyond that timeframe. Therefore, future adjustments to the amounts accrued may become necessary at a later date. For both the Voluntary Support Program 2020 and Extended ETO programs combined, approximately $188 million of the liability balances were relieved during first quarter 2021 through payments to Employees, leaving a balance of $611 million as of March 31, 2021. In response to flight schedule adjustments due to the effects of the COVID-19 pandemic, a number of aircraft were taken out of the Company’s schedule beginning in late March 2020, and placed in short-term storage, as well as some in a longer term storage program. As of March 31, 2021, 66 aircraft remained in temporary or long-term storage. Given the current expectation that these aircraft have been placed in storage temporarily, the Company has continued to record depreciation expense associated with them.