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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Property, Plant and Equipment [Table Text Block] | Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives less an estimated salvage value, which are as follows:
Aircraft and related flight equipment: |
Boeing 737 and Airbus 319/320 aircraft | 20-25 years
Bombardier Q400 aircraft | 15 years
Buildings | 25 - 30 years
Minor building and land improvements | 10 years
Capitalized leases and leasehold improvements | Generally shorter of lease term or estimated useful life
Computer hardware and software | 3-10 years
Other furniture and equipment | 5-10 years
Salvage values used for aircraft are 10% of the fair value, but as aircraft near the end of their useful lives, management updates the salvage value estimates based on current market conditions and expected use of the aircraft. “Related flight equipment” includes rotable and repairable spare inventories, which are depreciated over the associated fleet life unless otherwise noted.
Liabilities from Mileage Plan [Table Text Block] | Frequent flyer program deferred revenue and liabilities included in the consolidated balance sheets (in millions):
| 2016 |  | 2015
Current Liabilities: |  |  |
Other accrued liabilities | $ | 484 |  |  | $ | 368 |
Other Liabilities and Credits: |  |  |  |  |
Deferred revenue | 638 |  |  | 427 |
Other liabilities | 21 |  |  | 19 |
Total | $ | 1,143 |  |  | $ | 814 |
Revenue from Mileage Plan [Table Text Block] | Frequent flyer program revenue included in the consolidated statements of operations (in millions):
| 2016 |  | 2015 |  | 2014
Passenger revenues | $ | 293 |  |  | $ | 267 |  |  | $ | 246 |
Other—net revenues | 429 |  |  | 329 |  |  | 295 |
Total frequent flyer program revenues | $ | 722 |  |  | $ | 596 |  |  | $ | 541 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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