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CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net Income | $ 848 | $ 605 | $ 508
Related to marketable securities: |  |  |
Unrealized holding gains (losses) arising during the period | (6) | 2 | (9)
Reclassification of (gains) losses into Other-net nonoperating income (expense) | 1 | (2) | (2)
Income tax benefit (expense) | 2 | 0 | 4
Marketable securities, net of tax | (3) | 0 | (7)
Related to employee benefit plans: |  |  |
Actuarial gains/(losses) related to pension and other post retirement benefit plans | 10 | (210) | 358
Reclassification of net pension expense into Wages and benefits | 14 | 9 | 42
Income tax benefit (expense) | (14) | 76 | (150)
Employee benefit plans, net of tax | 10 | (125) | 250
Related to interest rate derivative instruments: |  |  |
Unrealized holding gains (losses) arising during the period | (5) | (8) | 10
Reclassification of (gains) losses into Aircraft rent | 6 | 6 | 6
Income tax benefit (expense) | (1) | 0 | (6)
Interest rate derivative instruments, net of tax | 0 | (2) | 10
Other comprehensive loss | 7 | (127) | 253
Comprehensive income | $ 855 | $ 478 | $ 761

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