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PROPERTY, PLANT AND EQUIPMENT
 6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment as of June 30, 2021 and December 31, 2020 consisted of the following (in millions):
20212020
Vehicles$9,963 $9,786 
Aircraft21,093 20,549 
Land2,056 2,052 
Buildings5,699 5,425 
Building and leasehold improvements4,980 4,921 
Plant equipment15,132 14,684 
Technology equipment2,774 2,626 
Construction-in-progress1,632 2,048 
63,329 62,091 
Less: Accumulated depreciation and amortization(30,698)(29,837)
Property, Plant and Equipment, Net$32,631 $32,254 
Property, plant and equipment purchased on account was $381 and $319 million as of June 30, 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. During the three months ended June 30, 2021 and 2020, there were no material impairment charges to our property, plant and equipment. During the six months ended June 30, 2021, we recognized impairment charges of $24 million due to the cancellation of certain facility expansion projects. There were no material impairment charges during the corresponding period of 2020.