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PROPERTY, PLANT AND EQUIPMENT
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment as of March 31, 2022 and December 31, 2021 consisted of the following (in millions):
20222021
Vehicles$10,083 $10,018 
Aircraft22,286 21,973 
Land2,135 2,140 
Buildings5,865 5,802 
Building and leasehold improvements5,004 5,010 
Plant equipment15,715 15,650 
Technology equipment2,848 2,798 
Construction-in-progress1,474 1,418 
65,410 64,809 
Less: Accumulated depreciation and amortization(31,815)(31,334)
Property, Plant and Equipment, Net$33,595 $33,475 
Property, plant and equipment purchased on account was $511 and $248 million as of March 31, 2022 and December 31, 2021, 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 impairment charges during the three months ended March 31, 2022. We recorded impairment charges of $24 million during the three months ended March 31, 2021, due to the reevaluation of certain facility projects.