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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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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):
| 2020 |  | 2019
Vehicles | $ | 9,786 |  |  | $ | 10,613 |
Aircraft | 20,549 |  |  | 19,045 |
Land | 2,052 |  |  | 2,087 |
Buildings | 5,425 |  |  | 5,046 |
Building and leasehold improvements | 4,921 |  |  | 4,898 |
Plant equipment | 14,684 |  |  | 13,849 |
Technology equipment | 2,626 |  |  | 2,206 |
Construction-in-progress | 2,048 |  |  | 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.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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