XML 79 R65.htm IDEA: XBRL DOCUMENT
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Description of the business and summary of significant accounting policies - Aircraft, rotable spare parts, furniture and equipment, net (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2015 aircraft | Dec. 31, 2017 MXN ($) agreement aircraft | Dec. 31, 2016 MXN ($) aircraft | Dec. 31, 2015 MXN ($) aircraft
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Maintenance deposits expensed as supplemental rent |  | $ 103,648 | $ 143,923 | $ 73,258
Number of aircraft added to fleet | aircraft |  | 5 | 17 | 7
Maintenance adjustment payments expensed as contingent rent |  | $ 162,108 | $ 201,434 | $ 290,857
Number of aircraft with lease term extended | aircraft | 3 | 3 | 2 |
Number of engine agreements for which lease term extended | agreement |  | 2 |  |
Maintenance deposits expensed to contingent rent prior to lease extensions |  | $ 65,716 | $ 92,528 |
Amortization of lease incentives |  | $ 88,224 | 74,748 | 45,313
Length of time before routine aircraft and engine maintenance is required |  | 22 months |  |
Additions |  | $ 2,584,232 | 2,198,697 |
Depreciation |  | 496,291 | 496,253 | 425,439
Capitalized borrowing costs |  | $ 193,389 | $ 95,445 | $ 90,057
Rate used to determine amount of borrowing cost |  | 3.30% | 2.88% | 2.80%
Impairment charges on rotable spare parts, furniture and equipment |  | $ 0 | $ 0 | $ 0
Aircraft parts and rotable spare parts |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  | 115,173 | 110,592 |
Depreciation |  | 44,409 | 33,430 |
Aircraft spare engines |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  | 385 | 323,025 |
Depreciation |  | 16,795 | 1,337 |
Standardization |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  | 15,833 | 21,953 |
Depreciation |  | $ 18,543 | 23,728 |
Annual depreciation rate |  | Remaining contractual lease term |  |
Computer equipment |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  | $ 1,845 | 740 |
Depreciation |  | $ 3,809 | 2,549 |
Annual depreciation rate |  | 25.00% |  |
Communications equipment |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  |  | 129 |
Depreciation |  | $ 796 | 831 |
Annual depreciation rate |  | 10.00% |  |
Office furniture and equipment |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  | $ 6,805 | 517 |
Depreciation |  | $ 3,801 | 3,559 |
Annual depreciation rate |  | 10.00% |  |
Electric power equipment |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  |  | 1,467 |
Depreciation |  | $ 1,294 | 1,946 |
Annual depreciation rate |  | 10.00% |  |
Workshop machinery and equipment |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  | $ 123 | 131 |
Depreciation |  | $ 722 | 692 |
Annual depreciation rate |  | 10.00% |  |
Service carts on board |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  |  | 36 |
Depreciation |  | $ 376 | 731 |
Annual depreciation rate |  | 20.00% |  |
Leasehold improvements to flight equipment |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Additions |  | $ 529,331 | 226,526 |
Depreciation |  | $ 382,745 | $ 404,659 | $ 352,932
Annual depreciation rate |  | The shorter of: (i) remaining contractual lease term, or (ii) the next major maintenance event |  |
Minimum |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Duration of routine aircraft and engine maintenance |  | 7 days |  |
Length of time before major aircraft and engine maintenance is required |  | 5 years |  |
Minimum | Aircraft parts and rotable spare parts |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Annual depreciation rate |  | 8.30% |  |
Minimum | Aircraft spare engines |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Annual depreciation rate |  | 4.00% |  |
Maximum |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Duration of routine aircraft and engine maintenance |  | 14 days |  |
Duration of major aircraft and engine maintenance |  | 42 days |  |
Length of time before major aircraft and engine maintenance is required |  | 6 years |  |
Maximum | Aircraft parts and rotable spare parts |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Annual depreciation rate |  | 16.70% |  |
Maximum | Aircraft spare engines |  |  |  |
Aircraft, rotable spare parts, furniture and equipment, net |  |  |  |
Annual depreciation rate |  | 8.30% |  |

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