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Debt Financing - Narrative (Details) $ in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2023 USD ($) aircraft | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) aircraft lender_supplement | Dec. 31, 2023 USD ($) aircraft | Feb. 15, 2024 USD ($) | Jan. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) aircraft | May 05, 2023 USD ($) | Dec. 31, 2022 USD ($) aircraft
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balance |  |  | $ 19,363,460 | $ 19,363,460 |  |  |  |  | $ 18,823,429
Secured Debt Financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balance |  |  | $ 305,500 | $ 305,500 |  |  |  |  | $ 125,400
Number of aircraft pledged as collateral | aircraft |  |  | 4 | 4 |  |  | 4 |  | 3
Collateral with net book value |  |  | $ 445,900 | $ 445,900 |  |  |  |  | $ 212,100
Senior unsecured securities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balance |  |  | 16,329,605 | 16,329,605 |  |  |  |  | 17,095,116
Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balance |  |  | $ 15,700,000 | $ 15,700,000 |  |  |  |  | $ 17,100,000
Senior Notes | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Remaining term |  |  | 1 month | 1 month |  |  | 1 month |  |
Interest rate |  |  | 0.70% | 0.70% |  |  | 0.70% |  | 0.70%
Senior Notes | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Remaining term |  |  | 8 years 14 days | 8 years 14 days |  |  | 8 years 14 days |  |
Interest rate |  |  | 5.94% | 5.94% |  |  | 5.94% |  | 5.85%
Medium Term Notes Due 2028 - 5.30% | Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.30% | 5.30% |  |  | 5.30% |  |
Principal amount issued |  |  | $ 700,000 | $ 700,000 |  |  |  |  |
Medium Term Note Due 2028 - 5.400% |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.40% | 5.40% |  |  | 5.40% |  |
Principal amount issued |  |  |  |  |  |  | $ 500.0 |  |
Interest rate, effective percentage |  |  | 5.942% | 5.942% |  |  | 5.942% |  |
Medium Term Notes Due 2029 - 5.10% | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.10% |  |  |
Principal amount issued |  |  |  |  |  | $ 500,000 |  |  |
Trust Certificates Due 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.85% | 5.85% |  |  | 5.85% |  |
Principal amount issued |  |  | $ 600,000 | $ 600,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balance |  |  | $ 1,100,000 | 1,100,000 |  |  |  |  | $ 1,020,000
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 7,200,000 |
Number of lender supplements | lender_supplement |  |  | 2 |  |  |  |  |  |
Increase in borrowing capacity |  |  | $ 275,000 | $ 275,000 |  |  |  |  |
Facility fee (as a percent) |  |  |  | 0.20% |  |  |  |  |
Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 7,400,000 |  |  |  |
Revolving Credit Facility | Debt Instrument, Redemption, May 5, 2027 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit maturity amount |  |  |  |  | 7,100,000 |  |  |  |
Revolving Credit Facility | Debt Instrument, Redemption, May 5, 2026 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit maturity amount |  |  |  |  | 320,000 |  |  |  |
Revolving Credit Facility | Debt Instrument, Redemption, May 5, 2025 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit maturity amount |  |  |  |  | $ 32,500 |  |  |  |
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest margin |  |  |  | 1.05% |  |  |  |  |
2023 Term Loan | Term financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount issued |  |  | 750,000 | $ 750,000 |  |  |  |  |
Credit spread adjustment |  |  |  | 0.10% |  |  |  |  |
2023 Term Loan | Secured Overnight Financing Rate (SOFR) | Term financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest margin |  |  |  | 1.40% |  |  |  |  |
Unsecured Note Due 2024 | Total unsecured debt financing |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount issued |  |  | 250,000 | $ 250,000 |  |  |  |  |
Credit spread adjustment |  |  |  | 0.10% |  |  |  |  |
Debt term |  |  |  | 1 year |  |  |  |  |
Unsecured Note Due 2024 | Secured Overnight Financing Rate (SOFR) | Total unsecured debt financing |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest margin |  |  |  | 1.25% |  |  |  |  |
Term financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding balance |  |  | $ 1,628,400 | $ 1,628,400 |  |  |  |  | $ 582,950
Secured Notes Due 2034 and 2035 | Secured Debt Financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of aircraft pledged as collateral | aircraft | 2 |  |  |  |  |  |  |  |
Secured Notes Due 2034 | Secured Debt Financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount issued |  | $ 112,200 |  |  |  |  |  |  |
Secured Notes Due 2034 | Three Month Secured Overnight Financing Rate (SOFR) | Secured Debt Financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest margin |  | 0.42% |  |  |  |  |  |  |
Secured Notes Due 2035 | Secured Debt Financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount issued | $ 101,700 |  |  |  |  |  |  |  |
Secured Notes Due 2035 | Three Month Secured Overnight Financing Rate (SOFR) | Secured Debt Financings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest margin | 0.42% |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481573/470-10-45-13 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481573/470-10-45-14 + Details
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