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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Operating Revenues |  |  |  |
Passenger, Mainline | $ 1,036 | $ 1,019 | $ 1,963 | $ 1,920
Passenger, Regional | 227 | 212 | 433 | 398
Total passenger revenue | 1,263 | 1,231 | 2,396 | 2,318
Freight and mail | 27 | 30 | 51 | 53
Other - net | 204 | 176 | 394 | 335
Total Operating Revenues | 1,494 | 1,437 | 2,841 | 2,706
Operating Expenses |  |  |  |
Wages and benefits | 332 | 305 | 668 | 611
Variable incentive pay | 32 | 32 | 64 | 58
Aircraft fuel, including hedging gains and losses | 201 | 261 | 368 | 496
Aircraft maintenance | 65 | 52 | 133 | 115
Aircraft rent | 26 | 26 | 55 | 52
Landing fees and other rentals | 63 | 66 | 143 | 137
Contracted services | 60 | 51 | 120 | 102
Selling expenses | 55 | 54 | 104 | 107
Depreciation and amortization | 92 | 79 | 180 | 155
Food and beverage service | 31 | 28 | 62 | 53
Third-party regional carrier expense | 24 | 17 | 47 | 33
Other | 81 | 94 | 175 | 177
Special items - merger costs | 14 | 0 | 14 | 0
Total Operating Expenses | 1,076 | 1,065 | 2,133 | 2,096
Operating Income | 418 | 372 | 708 | 610
Nonoperating Income (Expense) |  |  |  |
Interest income | 7 | 6 | 13 | 11
Interest expense | (9) | (11) | (22) | (22)
Interest capitalized | 7 | 8 | 15 | 16
Other - net | (3) | 1 | (2) | 1
Nonoperating Income (Expense) Total | 2 | 4 | 4 | 6
Income before income tax | 420 | 376 | 712 | 616
Income tax expense | 160 | 142 | 268 | 233
Net Income | $ 260 | $ 234 | $ 444 | $ 383
Basic Earnings Per Share (usd per share) | $ 2.11 | $ 1.80 | $ 3.58 | $ 2.93
Diluted Earnings Per Share (usd per share) | $ 2.10 | $ 1.79 | $ 3.56 | $ 2.91
Shares used for computation: |  |  |  |
Basic shares (shares) | 123,250,000 | 129,236,000 | 123,900,000 | 130,173,000
Diluted shares (shares) | 123,988,000 | 130,255,000 | 124,715,000 | 131,271,000
Cash dividend declared per share (usd per share) | $ 0.275 | $ 0.20 | $ 0.55 | $ 0.40

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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