Quarterly report pursuant to Section 13 or 15(d)

PROPERTY, PLANT AND EQUIPMENT

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PROPERTY, PLANT AND EQUIPMENT
 3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment as of March 31, 2020 and December 31, 2019 consisted of the following (in millions):
2020 2019
Vehicles $ 10,309    $ 10,613   
Aircraft 19,151    19,045   
Land 2,088    2,087   
Buildings 5,430    5,046   
Building and leasehold improvements 4,804    4,898   
Plant equipment 13,429    13,849   
Technology equipment 2,601    2,206   
Construction-in-progress 2,650    1,983   
60,462    59,727   
Less: Accumulated depreciation and amortization (29,554)   (29,245)  
$ 30,908    $ 30,482   
Property, plant and equipment purchased on account was $743 million and $372 million as of March 31, 2020 and December 31, 2019, respectively. 
We continually monitor our aircraft fleet utilization in light of current and projected volume levels, aircraft 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. No impairment charges on property, plant and equipment were recorded during the three months ended March 31, 2020 or 2019.