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QUARTERLY FINANCIAL DATA | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Data [Abstract] |
QUARTERLY FINANCIAL DATA | QUARTERLY FINANCIAL DATA (unaudited)
|  | Three months ended
(in millions except per share amounts) |  | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31
2015 |  |  |  |  |  |  |  |
Operating revenues (a)(b) |  | $ | 4,414 |  |  | $ | 5,111 |  |  | $ | 5,318 |  |  | $ | 4,977 |
Operating income |  | 780 |  |  | 1,085 |  |  | 1,225 |  |  | 1,026 |
Income before income taxes |  | 723 |  |  | 977 |  |  | 933 |  |  | 847 |
Net income |  | 453 |  |  | 608 |  |  | 584 |  |  | 536 |
Net income per share, basic (a)(b) |  | 0.67 |  |  | 0.91 |  |  | 0.89 |  |  | 0.83 |
Net income per share, diluted (a)(b) |  | 0.66 |  |  | 0.90 |  |  | 0.88 |  |  | 0.82 |
|  | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31
2014 |  |  |  |  |  |  |  |
Operating revenues (a) |  | $ | 4,166 |  |  | $ | 5,011 |  |  | $ | 4,800 |  |  | $ | 4,628 |
Operating income |  | 215 |  |  | 775 |  |  | 614 |  |  | 621 |
Income before income taxes |  | 244 |  |  | 746 |  |  | 525 |  |  | 302 |
Net income |  | 152 |  |  | 465 |  |  | 329 |  |  | 190 |
Net income per share, basic (a) |  | 0.22 |  |  | 0.67 |  |  | 0.48 |  |  | 0.28 |
Net income per share, diluted (a) |  | 0.22 |  |  | 0.67 |  |  | 0.48 |  |  | 0.28 |
(a) Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $43 million, $41 million, and $30 million, and increased both Basic and Diluted net income per share by approximately $.03, $.03, and $.02 for first, second, and third quarters of 2015, respectively. Also, as a result, fourth quarter 2014 Passenger revenues increased by approximately $55 million and both Basic and Diluted net income per share for the period increased by $.04. See Note 1 for further detail. (b) Includes the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, and increased both Basic and Diluted net income per share by approximately $.24 and $.10, respectively. See Note 1 for further detail.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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