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Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Operating Revenue by Geographic Region The following table presents operating revenue by geographic region (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Domestic (U.S. and Canada)
$
7,094

 
$
6,762

 
$
20,056

 
$
18,927

Atlantic
2,103

 
2,073

 
5,627

 
5,427

Pacific
1,280

 
1,339

 
3,867

 
3,855

Latin America
903

 
829

 
2,821

 
2,603

Total
$
11,380

 
$
11,003

 
$
32,371

 
$
30,812
Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Total Frequent flyer deferred revenue - beginning balance
$
5,198

 
$
4,989

 
$
5,005

 
$
4,783

Miles awarded
662

 
616

 
1,951

 
1,826

Travel miles redeemed (Passenger revenue)
(607
)
 
(580
)
 
(1,634
)
 
(1,508
)
Non-travel miles redeemed (Other operating revenue)
(34
)
 
(38
)
 
(103
)
 
(114
)
Total Frequent flyer deferred revenue - ending balance
$
5,219

 
$
4,987

 
$
5,219

 
$
4,987