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Business Combinations, Asset Acquisitions, and Joint Venture Formation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 15, 2024 | Sep. 30, 2024 | Sep. 18, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-Term Debt |  |  | $ 144 |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  | 977 |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  |  | 407 |  |  |  |  |
Goodwill |  | $ 2,703 |  | $ 2,703 |  | $ 2,703 |  | $ 1,943
Payments for Merger Related Costs |  |  |  |  |  | 146 |  |
Business Acquisition, Pro Forma Information, Description |  |  |  | 270 | $ 90 | 197 | $ (65) |
Proceeds from Secured Notes Payable | $ 625 |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  | 3,739 | 3,566 | 10,244 | 9,918 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt |  |  | 1,932 |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 95 |  | 3,072 | 2,839 | 8,201 | 7,873 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  | 331 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  | 110 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  | 58 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  | 57 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | 799 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 97 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities |  |  | 674 |  |  |  |  |
Goodwill, Acquired During Period |  |  | 761 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  |  | 77 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | 286 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | 27 |  |  |  |  |
Operating Income (Loss) |  | (52) |  | 341 | 211 | 497 | 362 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 4,093 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities |  |  | 68 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 5,070 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  | 75 |  |  |  |  |
Receivables - net |  | 510 |  | 510 |  | $ 510 |  | 383
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 1,925 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, lease |  |  | 239 |  |  |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration |  |  | 41 |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 936 |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination |  |  | ntangible assets
| Fair Value |  | Weighted Average Amortization Period
| (In millions) |  | (In years)
Customer Relationships | $ | 295 |  |  | 18
Co-brand Partnerships | 112 |  |  | 3
Total finite-lived intangible assets | 407 |  |  |
Hawaiian Trademark | 390 |  |  | N/A
Slots | 2 |  |  | N/A
Total intangible assets | $ | 799 |  |  |
Schedule of Business Acquisitions, by Acquisition |  |  | Purchase consideration Total purchase consideration includes the value of the cash paid for outstanding shares of Hawaiian, accelerated and vested equity awards attributable to pre-acquisition service, and change in control payments. Alaska funded the full transaction with cash on hand. The total purchase price is calculated as follows:
(in millions, except per share price) | September 18, 2024
Number of shares of Hawaiian common stock issued and outstanding as of September 18, 2024 | 52 |
Multiplied by cash consideration for each share of common stock per the merger agreement | $ | 18.00 |
Cash consideration paid for common stock issued and outstanding as of September 18, 2024 | 936 |
Cash consideration paid for settlement of equity awards and change in control payments | 41 |
Total purchase consideration | $ | 977 |
Business Acquisition, Pro Forma Information |  |  |  |  |  | The pro forma information includes adjustments for merger-related costs of $146 million assumed to have been incurred on January 1, 2023.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2024 |  | 2023 |  | 2024 |  | 2023
Revenue | $ | 3,739 |  |  | $ | 3,566 |  |  | $ | 10,244 |  |  | $ | 9,918 |
Net Income | 270 |  |  | 90 |  |  | 197 |  |  | (65) |
Customer Relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 295 |  |  |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life |  |  | 18 years |  |  |  |  |
Trademarks |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 390 |  |  |  |  |
4581 Airports, Flying Fields and Airport Terminal Services |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | 2 |  |  |  |  |
Co-brand partnerships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 112 |  |  |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life |  |  | 3 years |  |  |  |  |
Hawaiian Airlines |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Share Price |  |  | $ 18.00 |  |  |  |  |
Business Acquisition [Axis] |  |  | 52 |  |  |  |  |
Hawaiian Airlines |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 761 |  | $ 761 |  | $ 761 |  | $ 0
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  | $ 0 | $ 95 | $ 0 |
Air traffic liability [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  |  | $ 513 |  |  |  |  |
Deferred revenue, current [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  |  | 229 |  |  |  |  |
Deferred revenue, noncurrent [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities |  |  | 308 |  |  |  |  |
Current [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation |  |  | 65 |  |  |  |  |
Noncurrent [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation |  |  | 235 |  |  |  |  |
Pension obligation [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities |  |  | $ 153 |  |  |  |  |

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