Note E - Property and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment, Gross	$ 4,723,321	$ 4,618,263
Accumulated depreciation	(1,856,986)	(1,797,494)
Property and equipment, net	2,866,335	2,820,769
Flight Equipment [Member]
Property, Plant and Equipment, Gross	4,055,379	3,865,049
Ground Equipment [Member]
Property, Plant and Equipment, Gross	72,653	72,463
Leasehold Improvements, Facilities and Office Equipment [Member]
Property, Plant and Equipment, Gross	43,659	42,120
Aircraft Modifications and Projects in Progress [Member]
Property, Plant and Equipment, Gross	$ 551,630	$ 638,631