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Operating Segments and Related Disclosures
 12 Months Ended
Dec. 31, 2018
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:
 
2018
 
2017
 
2016
 
(in millions)
DOT—Domestic
$
2,990.7

 
$
2,432.1

 
$
2,134.4

DOT—Latin America and Caribbean
332.3

 
211.5

 
185.6

Total
$
3,323.0

 
$
2,643.6

 
$
2,320.0


During 2018, 2017 and 2016, 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.