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Leases (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) aircraft | Jun. 30, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($)
Sublease Income | $ 25,000,000 | $ 50,000,000 |
Sublease income - Remainder of 2019 | 48,000,000 | 48,000,000 | $ 348,000,000
Sublease income - 2020 | 78,000,000 | 78,000,000 | 357,000,000
Sublease income - 2021 | 41,000,000 | 41,000,000 | 244,000,000
Sublease income - 2022 | 17,000,000 | 17,000,000 | 172,000,000
Sublease income - 2023 | 7,000,000 | 7,000,000 | $ 146,000,000
Sublease income - 2024 | 1,000,000 | 1,000,000 |
Unrecorded Unconditional Purchase Obligation | $ 600,000,000 | $ 600,000,000 |
Lessee, Operating Lease, Lease Not yet Commenced, Description | aircraft | 16 | 16 |
B-717-200 |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft | 73 | 73 |
Finance Leased Assets, Number of Units | aircraft | 2 | 2 |
Property Subject To Or Available For Lease, Number Of Units, Total | aircraft | 88 | 88 |
Finance Leases, Contingent Rental Payments Due | $ 0 | $ 0 |
Owned Assets, Number of Units | aircraft | 10 | 10 |
Lease Terms For Owned Aircraft |  | 4 years |
Minimum | B-717-200 |  |  |
Sublease Terms |  | 3 months |
Minimum | 737 MAX 8 |  |  |
Lessee, Renewal Term |  | 8 years |
Minimum | Aircraft |  |  |
Lessee, Renewal Term |  | 1 year |
Lessee Operating and Finance Lease Term of Contract |  | 3 months |
Minimum | Airport-Related |  |  |
Lessee Operating Lease Terms of Contract |  | 1 month |
Minimum | Other Property |  |  |
Lessee Operating and Finance Lease Term of Contract |  | 3 months |
Maximum | B-717-200 |  |  |
Sublease Terms |  | 5 years |
Maximum | 737 MAX 8 |  |  |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract | 9 years | 9 years |
Maximum | Aircraft |  |  |
Lessee, Renewal Term |  | 5 years |
Lessee Operating and Finance Lease Term of Contract |  | 13 years |
Maximum | Airport-Related |  |  |
Lessee Operating Lease Terms of Contract |  | 27 years |
Maximum | Other Property |  |  |
Lessee, Renewal Term |  | 5 years |
Lessee Operating and Finance Lease Term of Contract |  | 8 years |

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