FINANCING ACTIVITIES	6 Months Ended
FINANCING ACTIVITIES	Jun. 30, 2020
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	FINANCING ACTIVITIES Debt During February 2020, the Company issued $500 million senior unsecured notes due 2030. The notes bear interest at 2.625 percent. Interest is payable semi-annually in arrears on February 10 and August 10, beginning in 2020. On March 12, 2020, the Company entered into a new $1.0 billion 364-day term loan credit facility agreement (the “364-Day Credit Agreement”) with a syndicate of lenders identified in the 364-Day Credit Agreement. The 364-Day Credit Agreement was drawn in full on the closing date. On March 30, 2020, the Company amended and restated the 364-Day Credit Agreement (the “Amended and Restated 364-Day Credit Agreement”) with a syndicate of lenders identified in the Amended and Restated 364-Day Credit Agreement to add additional term loan commitments of approximately $2.3 billion, add an uncommitted accordion increase provision to permit additional term loans in an aggregate amount not to exceed approximately $417 million, amend the pricing, amend certain covenants, add certain covenants, and provide for the grant of a security interest in certain aircraft and related assets. The Company drew approximately $2.3 billion under the Amended and Restated 364-Day Credit Agreement on April 1, 2020. On April 24, 2020, the Company drew an additional $350 million under the $417 million accordion feature. The Amended and Restated 364-Day Credit Agreement was originally set to mature in full on March 29, 2021. The outstanding Amended and Restated 364-Day Credit Agreement balance was repaid in full in second quarter 2020, and the agreement has been terminated. Concurrently with entering into the Amended and Restated 364-Day Credit Agreement on March 30, 2020, the Company also amended its existing $1.0 billion revolving credit facility expiring in August 2022 (the “Amended and Restated Revolving Credit Agreement”) to (i) amend the pricing and fees, (ii) amend certain covenants and provisions, (iii) add certain covenants, and (iv) provide for the grant of a security interest in certain aircraft and related assets. In second quarter 2020, the Company repaid in full the $1.0 billion drawn on the Amended and Restated Revolving Credit Agreement and, as of June 30, 2020, there were no amounts outstanding under the Amended and Restated Revolving Credit Agreement. Generally, amounts outstanding under the Amended and Restated Revolving Credit Agreement bear interest at interest rates based on either the LIBOR rate (selected by the Company for designated interest periods) or the “alternate base rate” (being the highest of (1) the Wall Street Journal prime rate, (2) one-month adjusted LIBOR (one-month LIBOR plus a statutory reserve rate) plus 1%, and (3) the New York Fed Bank Rate, plus 0.5%). The underlying LIBOR rate is subject to a floor of 1% per annum and the “alternate base rate” is subject to a floor of 1% per annum. The Amended and Restated Revolving Credit Agreement contains customary representations and warranties, covenants, and events of default. The Amended and Restated Revolving Credit Agreement is secured by a pool of aircraft and related assets, each with a minimum appraised value ratio requirement. Under the Amended and Restated Revolving Credit Agreement, the Company is required to maintain, at all times after March 31, 2021, a specified ratio of (x) adjusted net income (before interest, taxes, depreciation, amortization, and aircraft rental expense) less cash dividends to (y) interest and aircraft rental expense; and to maintain a minimum level of liquidity of $2.5 billion (defined as the aggregate amount available to be borrowed under the Amended and Restated Revolving Credit Agreement plus the aggregate amount of unrestricted cash and cash equivalents of the Company). The Amended and Restated Revolving Credit Agreement is a series of short-term borrowings; at the end of each borrowing the Company must elect to roll the facility over into the next borrowing or pay down the facility. The Amended and Restated Revolving Credit Agreement also has an accordion feature that would allow the Company, subject to, among other things, the procurement of incremental commitments, to increase the size of the facility to $1.5 billion. On May 1, 2020, the Company completed the public offering of $2.3 billion aggregate principal amount of 1.250% Convertible Senior Notes due 2025 (the “Convertible Notes”), which included the full exercise of the underwriters' option to buy an additional $300 million aggregate principal amount of Convertible Notes. The Convertible Notes bear interest at the rate of 1.250% per year and will mature on May 1, 2025. Interest on the notes is payable semi-annually in arrears on May 1 and November 1 of each year, beginning on November 1, 2020. The Company expects to use the net proceeds received for general corporate purposes. Holders may convert their Convertible Notes at their option at any time prior to the close of business on the business day immediately preceding February 1, 2025, only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2020 (and only during such calendar quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any ten consecutive trading day period in which the trading price per $1,000 principal amount of Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On or after February 1, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their notes at any time, regardless of the foregoing circumstances. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of the Company’s common stock or a combination of cash and shares of common stock, at the Company’s election. The Company intends, however, to settle conversions by paying cash up to the principal amount, with any excess conversion value settled in shares of common stock. The initial conversion rate is 25.9909 shares of common stock per $1,000 principal amount of Convertible Notes (equivalent to an initial conversion price of approximately $38.48 per share of common stock). The conversion rate will be subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. In addition, in the event of certain corporate events that occur prior to the maturity date, the Company will increase the conversion rate for a holder who elects to convert its Convertible Notes in connection with such a corporate event in certain circumstances. In the event of a “Fundamental Change,” as defined, the holders may require the Company to purchase for cash all or a portion of their notes at a purchase price equal to 100% of the principal amount of the notes, plus accrued and unpaid interest, if any. The Company may not redeem the notes at its option prior to the maturity date. Upon issuance, the Company bifurcated the Convertible Notes for accounting purposes between a liability component and an equity component utilizing applicable guidance. The liability component was determined by estimating the fair value of a hypothetical issuance of an identical offering excluding the conversion feature of the Convertible Notes, which has been estimated at $1.9 billion, and is reflected as a component of Long-term debt in the unaudited Condensed Consolidated Balance Sheet. The effective interest rate of this liability was 5.2%. The equity component was calculated as the difference between the liability component and the face amount of the Convertible Notes, determined to be $403 million, and is classified within Additional paid in capital in the unaudited Condensed Consolidated Balance Sheet. The Convertible Notes proceeds are also shown within the financing activities section in the unaudited Condensed Consolidated Statement of Cash Flows. The amount of the equity component in the transaction also represents a discount on liability portion of the Convertible Notes, and as such will be amortized as a non-cash component of interest expense over the 5-year term of the notes. The costs incurred in the issuance, including underwriters' discount, totaling $62 million, are classified as a cash outflow within the financing activities section in the unaudited Condensed Consolidated Statement of Cash Flows, and will also be amortized to expense over the term of the notes. Issuance costs attributable to the equity component of $11 million were netted with the equity component in the unaudited Condensed Consolidated Statement of Stockholders' Equity. The Company intends to settle conversions by paying cash up to the principal amount of the Convertible Notes, with any excess conversion value settled in shares of common stock. Therefore, the Convertible Notes are being accounted for using the treasury stock method for the purposes of Net income (loss) per share. Using this method, the denominator will be affected when the average share price of the Company's common stock for a given period is greater than the conversion price of approximately $38.48 per share. The Convertible Notes stipulate that holders of the notes may not elect to convert their Convertible Notes to shares of common stock until after June 30, 2020, and therefore there was no dilutive impact related to the notes until July 1, 2020. As consideration for the Payroll Support funding, the Company agreed to issue Warrants to the Treasury to purchase the Company's common stock in connection with each disbursement of Payroll Support to the Company. The Company accounts for the Warrants using the treasury stock method. Using this method, the denominator will be affected when the average share price of the Company's common stock for a given period is greater than the warrant exercise price of $36.47 per share. While the Company is reporting a net loss, all potential shares are considered antidilutive and have no impact on Net income (loss) per share. On May 4, 2020, the Company issued $2.0 billion of unsecured notes, consisting of $750 million aggregate principal amount of the Company’s 4.750% Notes due 2023 (the “$750 million 2023 Notes”) and $1.25 billion aggregate principal amount of the Company’s 5.250% Notes due 2025 (the “2025 Notes”). Interest on both the $750 million 2023 Notes and 2025 Notes is payable semi-annually in arrears on May 4 and November 4, beginning November 4, 2020. The proceeds from the $750 million 2023 Notes and 2025 Notes were used to repay a portion of the outstanding Amended and Restated 364-Day Credit Agreement balance. On June 8, 2020, the Company issued $1.8 billion of unsecured notes, consisting of $500 million aggregate principal amount of the Company’s 4.750% Notes due 2023 (the “$500 million 2023 Notes”) and $1.3 billion aggregate principal amount of the Company’s 5.125% Notes due 2027 (the “2027 Notes”). Interest on both the $500 million 2023 Notes and 2027 Notes is payable semi-annually. Interest on the $500 million 2023 Notes is payable in arrears on May 4 and November 4, beginning November 4, 2020 and interest on the 2027 Notes is payable in arrears on June 15 and December 15, beginning December 15, 2020. Approximately $1.7 billion combined proceeds of the $500 million 2023 Notes and 2027 Notes were used to repay the remaining outstanding Amended and Restated 364-Day Credit Agreement balance. The Company expects to use the remaining proceeds for general corporate purposes. In June 2020, the Company, through special purpose entities, entered into agreements with a financing institution and trusts to borrow $192 million secured by six Boeing 737-800 aircraft. These borrowings, which were recorded as a financing transaction in the Company's unaudited Condensed Consolidated Statement of Cash Flows, and as debt in the accompanying unaudited Condensed Consolidated Balance Sheet, bear interest at a rate of the 3 month LIBOR plus 1.4%, payable in quarterly installments through June 30, 2028. The special purpose entities were determined to be variable interest entities for which the Company is the primary beneficiary, and therefore were consolidated in the accompanying unaudited Condensed Consolidated Financial Statements. Other Financings Common Stock Issuance On May 1, 2020, the Company completed the public offering of 80.5 million shares of $1.00 par value common stock of the Company, which included the full exercise of the underwriters’ option to purchase an additional 10.5 million shares of common stock, at a public offering price of $28.50 per share (the “Common Stock Offering”). The Company expects to use the net proceeds of $2.2 billion from the Common Stock Offering for general corporate purposes. Sale-Leaseback of Aircraft In second quarter 2020, the Company entered into transactions with third parties, involving ten of the Company’s Boeing 737-800 aircraft and ten of the Company's Boeing 737 MAX 8 aircraft that qualified as sale-leaseback arrangements under applicable accounting guidance. The Company sold the ten 737-800 aircraft to a third party for $405 million, then immediately leased the aircraft back for approximately ten years. The Company sold the ten 737 MAX 8 aircraft to a third party for $410 million, then immediately leased the aircraft back for approximately 13 years. As such, the aircraft were de-recognized from Property and equipment at their remaining net book values. All of the leases from the sale-leasebacks are accounted for as operating leases, and thus are now reflected as part of the Company’s Operating lease right-of-use assets and operating lease liabilities in the accompanying unaudited Condensed Consolidated Balance Sheet. The 737-800 and 737 MAX 8 sale-leaseback transactions resulted in a recognized gain of $153 million and $69 million, respectively, reflected within Other operating expenses, net in the accompanying unaudited Condensed Consolidated Statement of Comprehensive Income. The 737-800 and 737 MAX 8 sale-leaseback transactions have increased the Company's future operating lease obligations by $35 million remaining in 2020, $71 million in each of the years from 2021 through 2025, and approximately $440 million thereafter. As of June 30, 2020, aggregate principal maturities of debt and finance leases (not including amounts associated with interest rate swap agreements, interest on finance leases, and amortization of purchase accounting adjustments) were $596 million for the remainder of 2020, $195 million in 2021, $499 million in 2022, $1.4 billion in 2023, $127 million in 2024, $3.7 billion in 2025, and $3.7 billion thereafter.