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Operating Segments and Related Disclosures (Tables)
12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Operating Revenues by Geographic Region Operating revenues by geographic region as defined by the Department of Transportation ("DOT") area are summarized below:
202320222021
(in millions)
DOT—Domestic$4,676.1 $4,371.8 $2,824.8 
DOT—Latin America and Caribbean686.4 696.6 406.0 
Total$5,362.5 $5,068.4 $3,230.8