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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
NET CASH PROVIDED BY OPERATING ACTIVITIES | $ 322,962 | $ 333,023
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of marketable securities | (722,347) | (533,465)
Sales of marketable securities | 715,951 | 732,774
Acquisition of property and equipment: |  |
Aircraft and rotable spare parts | (46,833) | (122,529)
Buildings and ground equipment | (10,180) | (11,338)
Proceeds from the sale of property and equipment | 2,958 | 3,815
Decrease (increase) in other assets | (15,542) | 734
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES | (75,993) | 69,991
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from issuance of long-term debt |  | 25,000
Principal payments on long-term debt | (225,799) | (221,148)
Payment of debt issuance cost |  | (108)
Net proceeds from issuance of common stock | 1,446 | 1,275
Employee income tax paid on vested equity awards | (6,930) | (585)
Purchase of treasury stock and excise tax | (22,203) | (195,999)
NET CASH USED IN FINANCING ACTIVITIES | (253,486) | (391,565)
Increase (decrease) in cash and cash equivalents | (6,517) | 11,449
Cash and cash equivalents at beginning of period | 148,277 | 102,984
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 141,760 | 114,433
Non-cash investing and financing activities: |  |
Acquisition of property and equipment | 28,244 | 73
Derecognition of right of use assets |  | (35,062)
Derecognition of operating lease liabilities |  | 35,062
Cash paid during the period for: |  |
Interest, net of capitalized amounts | 58,801 | 66,131
Income taxes | $ 14,268 | $ 2,902

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