Property, Plant and Equipment Disclosure
Asset Age Ratios (Summary)
Average Age
Estimated Total Useful Life
Estimated Age, Time Elapsed Since Purchase
Estimated Remaining Life

Delta Air Lines Inc., balance sheet: property, plant and equipment

US$ in millions

	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017
Flight equipment	33,368)	31,572)	36,713)	33,898)	30,688)
Ground property and equipment	7,758)	6,387)	5,721)	4,667)	7,665)
Information technology-related assets	3,389)	3,403)	3,276)	3,361)	—)
Flight and ground equipment under finance leases	2,052)	1,795)	1,608)	1,055)	1,147)
Advance payments for equipment	853)	883)	1,019)	1,177)	1,160)
Property and equipment, gross	47,420)	44,040)	48,337)	44,158)	40,660)
Accumulated depreciation and amortization	(18,671)	(17,511)	(17,027)	(15,823)	(14,097)
Property and equipment, net	28,749)	26,529)	31,310)	28,335)	26,563)

Based on: 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31), 10-K (reporting date: 2019-12-31), 10-K (reporting date: 2018-12-31), 10-K (reporting date: 2017-12-31).

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Item	Description	The company
Property and equipment, gross	Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.	Delta Air Lines Inc. property and equipment, gross decreased from 2019 to 2020 but then increased from 2020 to 2021 not reaching 2019 level.
Property and equipment, net	Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.	Delta Air Lines Inc. property and equipment, net decreased from 2019 to 2020 but then slightly increased from 2020 to 2021.

Delta Air Lines Inc., asset age ratios

	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017
Average age ratio	39.37%	39.76%	35.23%	35.83%	34.67%
Estimated total useful life (years)	24	19	19	19	18
Estimated age, time elapsed since purchase (years)	9	8	7	7	6
Estimated remaining life (years)	14	12	12	12	12

Based on: 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31), 10-K (reporting date: 2019-12-31), 10-K (reporting date: 2018-12-31), 10-K (reporting date: 2017-12-31).

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Asset age ratio	Description	The company
Average age ratio	As long as straight-line depreciation is used, this is an accurate estimate of asset age as a percentage of depreciable life. The relative age is a useful measure of whether the company fixed asset base is old or new. Newer assets are likely to be more efficient.	Delta Air Lines Inc. average age ratio of depreciable property, plant and equipment deteriorated from 2019 to 2020 but then slightly improved from 2020 to 2021.
Estimated total useful life	Over longer time periods, this ratio is a useful measure of company depreciation policy and can be used for comparisons with competitors.	Delta Air Lines Inc. estimated total useful life of depreciable property, plant and equipment increased from 2019 to 2020 and from 2020 to 2021.
Estimated time elapsed since purchase	The approximate age in years of a company fixed assets. Useful for comparison purposes.	Delta Air Lines Inc. estimated time elapsed since purchase of depreciable property, plant and equipment deteriorated from 2019 to 2020 and from 2020 to 2021.
Estimated remaining life		Delta Air Lines Inc. estimated remaining life of depreciable property, plant and equipment decreased from 2019 to 2020 but then increased from 2020 to 2021 exceeding 2019 level.

	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017
Selected Financial Data (US$ in millions)
Accumulated depreciation and amortization	18,671)	17,511)	17,027)	15,823)	14,097)
Property and equipment, gross	47,420)	44,040)	48,337)	44,158)	40,660)
Asset Age Ratio
Average age¹	39.37%	39.76%	35.23%	35.83%	34.67%

Based on: 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31), 10-K (reporting date: 2019-12-31), 10-K (reporting date: 2018-12-31), 10-K (reporting date: 2017-12-31).

2021 Calculations

¹ Average age = 100 × Accumulated depreciation and amortization ÷ Property and equipment, gross
= 100 × 18,671 ÷ 47,420 = 39.37%

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Asset age ratio	Description	The company
Average age	As long as straight-line depreciation is used, this is an accurate estimate of asset age as a percentage of depreciable life. The relative age is a useful measure of whether the company fixed asset base is old or new. Newer assets are likely to be more efficient.	Delta Air Lines Inc. average age ratio of depreciable property, plant and equipment deteriorated from 2019 to 2020 but then slightly improved from 2020 to 2021.

	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017
Selected Financial Data (US$ in millions)
Property and equipment, gross	47,420)	44,040)	48,337)	44,158)	40,660)
Depreciation and amortization expense related to property and equipment	2,000)	2,300)	2,600)	2,300)	2,200)
Asset Age Ratio (Years)
Estimated total useful life¹	24	19	19	19	18

Based on: 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31), 10-K (reporting date: 2019-12-31), 10-K (reporting date: 2018-12-31), 10-K (reporting date: 2017-12-31).

2021 Calculations

¹ Estimated total useful life = Property and equipment, gross ÷ Depreciation and amortization expense related to property and equipment
= 47,420 ÷ 2,000 = 24

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Asset age ratio	Description	The company
Estimated total useful life	Over longer time periods, this ratio is a useful measure of company depreciation policy and can be used for comparisons with competitors.	Delta Air Lines Inc. estimated total useful life of depreciable property, plant and equipment increased from 2019 to 2020 and from 2020 to 2021.

	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017
Selected Financial Data (US$ in millions)
Accumulated depreciation and amortization	18,671)	17,511)	17,027)	15,823)	14,097)
Depreciation and amortization expense related to property and equipment	2,000)	2,300)	2,600)	2,300)	2,200)
Asset Age Ratio (Years)
Time elapsed since purchase¹	9	8	7	7	6

Based on: 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31), 10-K (reporting date: 2019-12-31), 10-K (reporting date: 2018-12-31), 10-K (reporting date: 2017-12-31).

2021 Calculations

¹ Time elapsed since purchase = Accumulated depreciation and amortization ÷ Depreciation and amortization expense related to property and equipment
= 18,671 ÷ 2,000 = 9

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Asset age ratio	Description	The company
Estimated time elapsed since purchase	The approximate age in years of a company fixed assets. Useful for comparison purposes.	Delta Air Lines Inc. estimated time elapsed since purchase of depreciable property, plant and equipment deteriorated from 2019 to 2020 and from 2020 to 2021.

	Dec 31, 2021	Dec 31, 2020	Dec 31, 2019	Dec 31, 2018	Dec 31, 2017
Selected Financial Data (US$ in millions)
Property and equipment, net	28,749)	26,529)	31,310)	28,335)	26,563)
Depreciation and amortization expense related to property and equipment	2,000)	2,300)	2,600)	2,300)	2,200)
Asset Age Ratio (Years)
Estimated remaining life¹	14	12	12	12	12

Based on: 10-K (reporting date: 2021-12-31), 10-K (reporting date: 2020-12-31), 10-K (reporting date: 2019-12-31), 10-K (reporting date: 2018-12-31), 10-K (reporting date: 2017-12-31).

2021 Calculations

¹ Estimated remaining life = Property and equipment, net ÷ Depreciation and amortization expense related to property and equipment
= 28,749 ÷ 2,000 = 14

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Asset age ratio	Description	The company
Estimated remaining life		Delta Air Lines Inc. estimated remaining life of depreciable property, plant and equipment decreased from 2019 to 2020 but then increased from 2020 to 2021 exceeding 2019 level.

Delta Air Lines Inc. (NYSE:DAL)

Analysis of Property, Plant and Equipment

Property, Plant and Equipment Disclosure

Asset Age Ratios (Summary)

Average Age

Estimated Total Useful Life

Estimated Age, Time Elapsed since Purchase

Estimated Remaining Life