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Restructuring
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Restructuring RESTRUCTURING

The following table shows the balances and activity for restructuring charges:
(in millions)
2018
2017
2016
Liability at beginning of period
$
237

$
333

$
467

Reclassified to lease liability
(195
)
—

—

Payments
(5
)
(103
)
(144
)
Additional expenses and other
1

7

10

Liability at end of period
$
38

$
237

$
333



Restructuring charges in 2017 and 2016 primarily include remaining lease payments for permanently grounded aircraft related to domestic and Pacific fleet restructurings. The domestic fleet restructuring involves 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. The Pacific fleet restructuring resulted in the 2017 retirement of the B-747-400 fleet, which is being replaced with smaller-gauge, widebody aircraft to better match capacity with demand.

As a result of the implementation of the new lease accounting standard, $195 million of the lease restructuring liability related to aircraft and certain airport facilities was reclassified at adoption on January 1, 2018 to current and noncurrent operating lease liabilities. The remaining balance in the restructuring liability at December 31, 2018 is primarily related to certain airport facilities with variable rates.