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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2020
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, 2020 and 2019 (in millions):
20202019
Vehicles$9,786 $10,613 
Aircraft20,549 19,045 
Land2,052 2,087 
Buildings5,425 5,046 
Building and leasehold improvements4,921 4,898 
Plant equipment14,684 13,849 
Technology equipment2,626 2,206 
Construction-in-progress2,048 1,983 
62,091 59,727 
Less: Accumulated depreciation and amortization(29,837)(29,245)
Property, Plant and Equipment, Net$32,254 $30,482 
Property, plant and equipment purchased on account was $319 and $372 million as of December 31, 2020 and 2019, 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. There were no material impairment charges during the years ended December 31, 2020 or 2019.