Operating Segments and Related Disclosures (Details) $ in Thousands	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Mar. 12, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 segment	Sep. 30, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment					1
Number of reportable segments | segment					1
Total operating revenues	$ 755,354	$ 958,524	$ 1,197,104	$ 2,235,402		$ 3,743,530
Reporting Segment
Segment Reporting Information [Line Items]
Total operating revenues	755,354	958,524	1,197,104	2,235,402		3,743,530
DOT—Domestic | Reporting Segment
Segment Reporting Information [Line Items]
Total operating revenues	663,201	834,875	1,084,576	1,980,566		3,320,511
DOT—Latin America | Reporting Segment
Segment Reporting Information [Line Items]
Total operating revenues	$ 92,153	$ 123,649	$ 112,528	$ 254,836		$ 423,019