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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Schedule of Finite Lived Intangible Assets | The following table is a summary of the Company’s intangible assets, which are included as a component of Other assets in the Company's Consolidated Balance Sheet, as of December 31, 2015 and 2014:
|  |  | Year ended December 31, 2015 |  | Year ended December 31, 2014
(in millions) | Weighted-average useful life (in years) |  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated Amortization
Customer relationships/marketing agreements | 9 |  | $ | 38 |  |  | $ | 30 |  |  | $ | 38 |  |  | $ | 26 |
Trademarks/trade names | 6 |  | 36 |  |  | 34 |  |  | 36 |  |  | 30 |
Owned domestic slots | Indefinite |  | 303 |  |  | n/a |  |  | 303 |  |  | n/a |
Leased domestic slots (b) | 47 |  | 17 |  |  | 3 |  |  | 19 |  |  | 5 |
Gate leasehold rights (a) | 15 |  | 180 |  |  | 43 |  |  | 60 |  |  | 32 |
Total | 15 |  | $ | 574 |  |  | $ | 110 |  |  | $ | 456 |  |  | $ | 93 |
(a) Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates at Chicago’s Midway International Airport, takeoff and landing slots (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets recognized from the AirTran acquisition. The increase in Intangible assets during 2015 was primarily due to the acquisition of two additional airport gate rights at Dallas Love Field, which were subleased from United Airlines. The purchase price paid for these airport gate rights was included as a component of Capital expenditures in the accompanying Consolidated Statement of Cash Flows. (b) Useful life of leased slots is based on the stated lease term.
Schedule of New Accounting Principles - Chase Agreement | The estimated impacts on revenue and earnings from this change in accounting principle are as follows:
(in millions, except per share amounts) |  | Year ended December 31, 2015
Passenger revenue |  | $ | (89 | )
Special revenue adjustment |  | 172 |
Other revenue |  | 344 |
Operating revenues |  | $ | 427 |
Net income |  | $ | 227 |
Net income per basic share |  | $ | 0.34 |
Net income per diluted share |  | $ | 0.34 |
Schedule of Change in Accounting Estimate [Table Text Block] | This change in estimate was recorded on a prospective basis, as of October 1, 2014, the impacts on revenue and earnings are as follows:
(in millions, except per share amounts) |  | Year ended December 31, 2015 | Year ended December 31, 2014
Passenger revenue |  | $ | 115 |  | $ | 55 |
Net income |  | $ | 61 |  | $ | 29 |
Net income per basic share |  | $ | 0.09 |  | $ | 0.04 |
Net income per diluted share |  | $ | 0.09 |  | $ | 0.04 |

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- Definition Tabular disclosure of the change in an accounting estimate, including a change that occurs in an interim period. If a change in accounting estimate affects several future periods (for example, a change in the service life of a depreciable asset) disclose the effect on income from continuing operations, net income (or other appropriate captions of changes in the applicable net assets or performance indicator), and any related per-share amounts of the current period. Disclosure of the effects of a change in an accounting estimate that occurs in the ordinary course of business (such as uncollectible accounts or inventory obsolescence) is not required, unless the effect is material. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e777-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6368906&loc=d3e21843-107793 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22595-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(a)(5)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 + Details
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