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New Accounting Pronouncement and Changes in Accounting or Estimates (Tables) | 6 Months Ended
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Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract] |
Schedule of New Changes in Accounting Principles - Chase Agreement | The estimated impacts on revenue and earnings associated with the Agreement and this change in accounting principle for the three and six months ended June 30, 2016 are as follows:
(in millions, except per share amounts) | Three months ended June 30, 2016 |  | Six months ended June 30, 2016
Passenger revenue | $ | (66 | ) |  | $ | (120 | )
Other revenue | 203 |  |  | 381 |
Operating revenues | $ | 137 |  |  | $ | 261 |
Net income | $ | 73 |  |  | $ | 139 |
Net income per basic share | $ | 0.12 |  |  | $ | 0.22 |
Net income per diluted share | $ | 0.11 |  |  | $ | 0.22 |
Schedule of Change in Accounting Estimate - Depreciation | The estimated impacts on expense and earnings from this change in assumption for the three and six months ended June 30, 2016 are as follows:
(in millions, except per share amounts) | Three months ended June 30, 2016 |  | Six months ended June 30, 2016
Depreciation expense | $ | 34 |  |  | $ | 62 |
Net income | $ | (18 | ) |  | $ | (33 | )
Net income per basic share | $ | (0.03 | ) |  | $ | (0.05 | )
Net income per diluted share | $ | (0.03 | ) |  | $ | (0.05 | )

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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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