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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Operating Revenues |  |  |  |
Passenger, Mainline | $ 1,562 | $ 1,073 | $ 4,390 | $ 3,036
Passenger, Regional | 262 | 249 | 725 | 682
Total passenger revenue | 1,824 | 1,322 | 5,115 | 3,718
Freight and mail | 32 | 31 | 88 | 82
Other—net | 264 | 213 | 768 | 607
Total Operating Revenues | 2,120 | 1,566 | 5,971 | 4,407
Operating Expenses |  |  |  |
Wages and benefits | 475 | 340 | 1,392 | 1,008
Variable incentive pay | 40 | 31 | 98 | 95
Aircraft fuel, including hedging gains and losses | 368 | 225 | 1,051 | 593
Aircraft maintenance | 88 | 64 | 271 | 197
Aircraft rent | 70 | 25 | 204 | 80
Landing fees and other rentals | 124 | 89 | 338 | 232
Contracted services | 76 | 63 | 234 | 183
Selling expenses | 91 | 58 | 269 | 162
Depreciation and amortization | 95 | 101 | 275 | 281
Food and beverage service | 50 | 31 | 145 | 93
Third-party regional carrier expense | 30 | 25 | 84 | 72
Special items—merger-related costs | 24 | 22 | 88 | 36
Other | 150 | 92 | 424 | 267
Total Operating Expenses | 1,681 | 1,166 | 4,873 | 3,299
Operating Income | 439 | 400 | 1,098 | 1,108
Nonoperating Income (Expense) |  |  |  |
Interest income | 9 | 7 | 25 | 20
Interest expense | (26) | (11) | (77) | (33)
Interest capitalized | 5 | 6 | 13 | 21
Other—net | 0 | 0 | (1) | (2)
Nonoperating Income (Expense) Total | (12) | 2 | (40) | 6
Income before income tax | 427 | 402 | 1,058 | 1,114
Income tax expense | 161 | 146 | 397 | 414
Net Income | $ 266 | $ 256 | $ 661 | $ 700
Basic Earnings Per Share (usd per share) | $ 2.15 | $ 2.08 | $ 5.35 | $ 5.66
Diluted Earnings Per Share (usd per share) | $ 2.14 | $ 2.07 | $ 5.31 | $ 5.63
Shares used for computation: |  |  |  |
Basic shares (shares) | 123,467 | 123,149 | 123,501 | 123,648
Diluted shares (shares) | 124,220 | 123,833 | 124,341 | 124,393
Cash dividend declared per share (usd per share) | $ 0.3 | $ 0.275 | $ 0.9 | $ 0.825

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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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