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PROPERTY, PLANT AND EQUIPMENT
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment as of March 31, 2021 and December 31, 2020 consisted of the following (in millions):
20212020
Vehicles$9,901 $9,786 
Aircraft20,844 20,549 
Land2,042 2,052 
Buildings5,445 5,425 
Building and leasehold improvements4,960 4,921 
Plant equipment14,821 14,684 
Technology equipment2,736 2,626 
Construction-in-progress1,889 2,048 
62,638 62,091 
Less: Accumulated depreciation and amortization(30,183)(29,837)
Property, Plant and Equipment, Net$32,455 $32,254 
Property, plant and equipment purchased on account was $454 and $319 million as of March 31, 2021 and December 31, 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 $24 million for the three months ended March 31, 2021 due to the timing of cancellation of certain facility expansion projects. We recognized these impairment charges within Other expenses in the statements of consolidated income. No impairment charges were recorded for the three months ended March 31, 2020.