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Operating Segments and Related Disclosures
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Operating Segments and Related Disclosures Operating Segments and Related Disclosures
The Company is managed as a single business unit that provides air transportation for passengers. Operating revenues by geographic region as defined by the Department of Transportation ("DOT") area are summarized below:
202020192018
(in millions)
DOT—Domestic$1,660.7 $3,462.8 $2,990.7 
DOT—Latin America and Caribbean149.3 367.7 332.3 
Total$1,810.0 $3,830.5 $3,323.0 
During 2020, 2019 and 2018, no revenue from any one foreign country represented greater than 4% of the Company’s total passenger revenue. The Company attributes operating revenues by geographic region based upon the origin and destination of each passenger flight segment. The Company’s tangible assets consist primarily of flight equipment, which are mobile across geographic markets and, therefore, have not been allocated.