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Restructuring
 6 Months Ended
Jun. 30, 2017
Restructuring and Related Activities [Abstract]  
Restructuring RESTRUCTURING

The following table shows the balances and activity for lease restructuring charges:
(in millions)
Lease Restructuring
Liability as of January 1, 2017
$
329

Payments
(47
)
Additional expenses and other
(10
)
Liability as of June 30, 2017
$
272



Lease restructuring charges include remaining lease payments for permanently grounded aircraft related to domestic and Pacific fleet restructurings. We are continuing to restructure our domestic fleet by replacing a portion of our 50-seat regional fleet with more efficient and customer preferred aircraft and replacing older, less cost effective B-757-200 aircraft with B-737-900ER aircraft. We are also restructuring our Pacific fleet by removing less efficient B-747-400 aircraft by the end of 2017 and replacing them with smaller-gauge, widebody aircraft to better match capacity with demand.