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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
OPERATING REVENUES: |  |  |  |  |
Total operating revenues | $ 829,275 | $ 812,673 | [1] | $ 2,418,190 | $ 2,351,351
OPERATING EXPENSES: |  |  |  |  |
Salaries, wages and benefits | 301,378 | 304,014 | [1] | 901,775 | 896,476
Depreciation and amortization | 86,088 | 74,095 | [1] | 246,386 | 215,415
Other operating expenses | 68,859 | 65,432 | [1] | 206,511 | 190,235
Total operating expenses | 691,350 | 700,304 | [1] | 2,065,412 | 2,056,092
OPERATING INCOME | 137,925 | 112,369 | [1] | 352,778 | 295,259
OTHER INCOME (EXPENSE): |  |  |  |  |
Interest income | 2,283 | 1,408 | [1] | 5,692 | 3,398
Interest expense | (31,440) | (27,101) | [1] | (86,485) | (78,713)
Other income (expense), net | 1,157 |  |  | 3,470 |
Total other expense, net | (28,000) | (25,693) | [1] | (77,323) | (75,315)
INCOME BEFORE INCOME TAXES | 109,925 | 86,676 | [1] | 275,455 | 219,944
PROVISION FOR INCOME TAXES | 26,879 | 32,960 | [1] | 62,189 | 80,966
NET INCOME | $ 83,046 | $ 53,716 | [1] | $ 213,266 | $ 138,978
BASIC EARNINGS PER SHARE (in dollars per share) | $ 1.60 | $ 1.04 | [1] | $ 4.10 | $ 2.68
DILUTED EARNINGS PER SHARE (in dollars per share) | $ 1.57 | $ 1.01 | [1] | $ 4.03 | $ 2.62
Weighted average common shares: |  |  |  |  |
Basic (in shares) | 52,039 | 51,833 | [1] | 52,002 | 51,801
Diluted (in shares) | 52,981 | 53,080 | [1] | 52,976 | 53,087
COMPREHENSIVE INCOME: |  |  |  |  |
Net income | $ 83,046 | $ 53,716 | [1] | $ 213,266 | $ 138,978
Net unrealized appreciation (depreciation) on marketable securities, net of taxes | (2) | 11 | [1] | 32 | 67
TOTAL COMPREHENSIVE INCOME | 83,044 | 53,727 | [1] | 213,298 | 139,045
Flying agreements |  |  |  |  |
OPERATING REVENUES: |  |  |  |  |
Total operating revenues | 816,057 | 800,965 | [1] | 2,377,659 | 2,317,218
Airport customer service and other |  |  |  |  |
OPERATING REVENUES: |  |  |  |  |
Total operating revenues | 13,218 | 11,708 | [1] | 40,531 | 34,133
Aircraft maintenance, materials and repairs |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Total operating expenses | 142,285 | 148,787 | [1] | 423,665 | 433,467
Aircraft rentals |  |  |  |  |
OPERATING REVENUES: |  |  |  |  |
Total operating revenues | 208,813 | 213,967 |  | 599,188 | 621,099
OPERATING EXPENSES: |  |  |  |  |
Total operating expenses | 36,827 | 54,976 | [1] | 119,015 | 168,098
Aircraft fuel |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Other operating expenses |  | 22,791 |  |  | 61,295
Total operating expenses | 25,655 | 30,209 | [1] | 80,852 | 91,106
Airport related expenses |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |
Other operating expenses |  | 30,209 |  |  | 91,106
Total operating expenses | $ 30,258 | $ 22,791 | [1] | $ 87,208 | $ 61,295
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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