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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Operating Revenues |  |  |  |
Passenger, Mainline | $ 1,073 | $ 1,057 | $ 3,036 | $ 2,977
Passenger, Regional | 249 | 240 | 682 | 638
Total passenger revenue | 1,322 | 1,297 | 3,718 | 3,615
Freight and mail | 31 | 30 | 82 | 83
Other - net | 213 | 188 | 607 | 523
Total Operating Revenues | 1,566 | 1,515 | 4,407 | 4,221
Operating Expenses |  |  |  |
Wages and benefits | 340 | 312 | 1,008 | 923
Variable incentive pay | 31 | 32 | 95 | 90
Aircraft fuel, including hedging gains and losses | 225 | 245 | 593 | 741
Aircraft maintenance | 64 | 67 | 197 | 182
Aircraft rent | 25 | 26 | 80 | 78
Landing fees and other rentals | 89 | 80 | 232 | 217
Contracted services | 63 | 54 | 183 | 157
Selling expenses | 58 | 53 | 162 | 160
Depreciation and amortization | 101 | 81 | 281 | 236
Food and beverage service | 31 | 30 | 93 | 83
Third-party regional carrier expense | 25 | 20 | 72 | 52
Other | 92 | 82 | 267 | 259
Special items - merger costs | 22 | 0 | 36 | 0
Total Operating Expenses | 1,166 | 1,082 | 3,299 | 3,178
Operating Income | 400 | 433 | 1,108 | 1,043
Nonoperating Income (Expense) |  |  |  |
Interest income | 7 | 5 | 20 | 16
Interest expense | (11) | (10) | (33) | (32)
Interest capitalized | 6 | 9 | 21 | 25
Other - net | 0 | 0 | (2) | 1
Nonoperating Income (Expense) Total | 2 | 4 | 6 | 10
Income before income tax | 402 | 437 | 1,114 | 1,053
Income tax expense | 146 | 163 | 414 | 396
Net Income | $ 256 | $ 274 | $ 700 | $ 657
Basic Earnings Per Share (usd per share) | $ 2.08 | $ 2.15 | $ 5.66 | $ 5.08
Diluted Earnings Per Share (usd per share) | $ 2.07 | $ 2.14 | $ 5.63 | $ 5.05
Shares used for computation: |  |  |  |
Basic shares (shares) | 123,149,000 | 127,308,000 | 123,648,000 | 129,231,000
Diluted shares (shares) | 123,833,000 | 128,205,000 | 124,393,000 | 130,200,000
Cash dividend declared per share (usd per share) | $ 0.275 | $ 0.20 | $ 0.825 | $ 0.60

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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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