Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT

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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, including both owned assets as well as assets subject to finance leases, consists of the following as of December 31, 2021 and 2020 (in millions):
2021 2020
Vehicles $ 10,018  $ 9,786 
Aircraft 21,973  20,549 
Land 2,140  2,052 
Buildings 5,802  5,425 
Building and leasehold improvements 5,010  4,921 
Plant equipment 15,650  14,684 
Technology equipment 2,798  2,626 
Construction-in-progress 1,418  2,048 
64,809  62,091 
Less: Accumulated depreciation and amortization (31,334) (29,837)
Property, Plant and Equipment, Net $ 33,475  $ 32,254 
Property, plant and equipment purchased on account was $248 and $319 million as of December 31, 2021 and 2020, respectively. 
We continually monitor our aircraft fleet utilization in light of current and projected volume levels, aviation fuel prices and other factors. Additionally, we monitor all other property, plant and equipment categories for any indicators that the carrying value of the assets may not be recoverable. We recognized impairment charges of $71 million during the year ended December 31, 2021, due to the reevaluation of certain facility projects. There were no material impairment charges during the year ended December 31, 2020.