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Intangibles | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangibles | Intangibles Maintenance rights and lease premium, net Maintenance rights and lease premium, net consisted of the following as of December 31, 2021 and 2020:
| As of December 31,
| 2021 |  | 2020
Maintenance rights | $ | 3,292,007 |  |  | $ | 642,825 |
Lease premium, net | 1,152,513 |  |  | 7,089 |
| $ | 4,444,520 |  |  | $ | 649,914 |
Movements in maintenance rights during the years ended December 31, 2021 and 2020 were as follows:
| Year Ended December 31,
| 2021 |  | 2020
Maintenance rights at beginning of period | $ | 642,825 |  |  | $ | 794,798 |
GECAS Transaction | 2,790,324 |  |  | — |
EOL and MR contract maintenance rights expense | (7,048) |  |  | (45,655) |
MR contract maintenance rights write-off due to maintenance liability release | (17,260) |  |  | (35,897) |
EOL contract maintenance rights write-off due to cash receipt | (114,472) |  |  | (51,463) |
EOL and MR contract maintenance rights write-off due to sale of aircraft and impairment | (2,362) |  |  | (18,958) |
Maintenance rights at end of period | $ | 3,292,007 |  |  | $ | 642,825 |
The following tables present details of lease premium assets and related accumulated amortization as of December 31, 2021:
| As of December 31, 2021
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Lease premium (a) | $ | 1,216,541 |  |  | $ | (64,028) |  |  | $ | 1,152,513 |
(a) $1.2 billion was acquired on the Closing Date as part of the GECAS Transaction. Refer to Note 4—GECAS Transaction. Lease premium assets that are fully amortized are removed from the gross carrying amount and accumulated amortization columns in the tables above. The weighted average amortization period remaining for lease premium is 6.2 years. During the year ended December 31, 2021, we recorded amortization expense for lease premium assets of $48.2 million. As of December 31, 2021, the estimated future amortization expense for lease premium assets was as follows:
| Estimated amortization expense
2022 | $ | 242,004 |
2023 | 210,865 |
2024 | 192,232 |
2025 | 142,957 |
2026 | 115,935 |
Thereafter | 248,520 |
| $ | 1,152,513 |
Other intangibles Other intangibles consisted of the following as of December 31, 2021 and 2020:
|  | As of December 31,
|  | 2021 |  | 2020
Customer relationships, net |  | $ | 198,412 |  |  | $ | 219,589 |
Other intangible assets |  | 10,467 |  |  | 5,045 |
|  | $ | 208,879 |  |  | $ | 224,634 |
The following tables present details of customer relationships and related accumulated amortization as of December 31, 2021 and 2020:
| As of December 31, 2021
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (161,588) |  |  | $ | 198,412 |
| As of December 31, 2020
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (140,411) |  |  | $ | 219,589 |
During the years ended December 31, 2021, 2020 and 2019, we recorded annual amortization expense for customer relationships of $21.2 million. The weighted average amortization period remaining for customer relationships is 9.4 years. As of December 31, 2021, the estimated future amortization expense for customer relationships was as follows:
| Estimated amortization expense
2022 | $ | 21,176 |
2023 | 21,176 |
2024 | 21,176 |
2025 | 21,176 |
2026 | 21,176 |
Thereafter | 92,532 |
| $ | 198,412 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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