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Two Delta airplanes fly side by side above open water, with a lush mountain range visible in the distance under a clear sky.
Two Delta airplanes fly side by side above open water, with a lush mountain range visible in the distance under a clear sky.

GHG Emissions Data

GHG Emissions Inventory (metric tons CO2e)1,2

Scope 1

2019 (baseline) 2023 2024 2025
Jet Fuel — Mainline Delta 34,967,854 34,799,606 36,190,207 37,134,782
Sustainable Aviation Fuel (SAF) 286 1,066 1,708
Jet Fuel — Wholly Owned Subsidiaries 2,181,283 1,650,912 1,715,403 2,013,382
Ground Operations (ground support equipment fuel use) 97,316 86,186 79,979 86,610
Ground Operations (noncombustion sources like paints, chemicals, etc.) 81,968 110,359 75,413 65,508
TOTAL SCOPE 1 37,328,421 36,647,348 38,062,069 39,301,990

Scope 23

2019 (baseline) 2023 2024 2025
TOTAL SCOPE 2 - LOCATION BASED 152,849 107,945 116,079 116,107

Scope 34

2019 (baseline) 2023 2024 2025
Cat 1 (Purchased Goods & Services) 1,664,146 1,627,496 2,256,565
Cat 2 (Capital Goods) 1,565,215 1,828,810 2,296,475
Cat 3 (Fuel) 10,946,766 8,591,469 9,601,217 10,034,863
Cat 4 (Upstream Transport) 690,054 1,041,200 405,207
Cat 5 (Waste) 68,454 73,436
Cat 6 (Business Travel) 91,472 120,677 14,747
Cat 7 (Employee Commute)5 365,488 362,213 366,836
Cat 8 (Upstream Leased Assets)3 143,040 80,484 60,531 233,150
Cat 15 (Investments) 5,162,982 6,618,771 7,176,026
TOTAL SCOPE 3 11,089,806 18,211,309 21,329,368 22,857,305
SUM OF EMISSIONS 48,571,076 54,966,603 59,507,516 62,275,402
Biogenic TTW Emissions (SAF)6 34,026 126,925 203,346
  1. All emissions were calculated and verified using the GHG Protocol, which is in alignment with the guidance of the SBTi.(a)
  2. Emissions calculations use the most current emission factors to stay aligned with other International Civil Aviation Organization member airlines as well as the GHG Protocol. Previous years’ emissions from jet fuel (within Scope 1 and Scope 3, Category 3) have been updated to reflect the most up-to-date emissions factors. Scope 3 (Categories 1, 2 and 4) use previous years’ emissions factors adjusted for inflation.(a)
  3. Scope 2 emissions are reported as location‑based; market‑based emissions are equivalent due to Delta‑supported renewable energy generation for its facilities. In 2025, Delta updated its methodology for estimating emissions from leased, non‑metered airport facilities. In accordance with GHG Protocol guidance, electricity use is reported only where data are available. These emissions are now reported in Scope 3 Category 8 for all reported years.(a) (b)
  4. Scope 3 data for 2019 includes Categories 3 and 8; Scope 3 for 2023 includes Categories 1, 2, 3, 4, 6, 7, 8 and 15; Scope 3 for 2024 and 2025 includes Categories 1, 2, 3, 4, 5, 6, 7, 8 and 15. Scope 3 Categories 3, 5, 7, 8 and 15 calculations use primary data. Scope 3 Categories 1, 2, 4 and 6 use a hybrid of primary and secondary (spend) data, which incorporates an updated methodology in 2025, previous years have not been restated.(a)
  5. Changes in Scope 3 Category 7 values from those reported in the 2024 Delta Difference Report are due to updates in methodology.(a)
  6. Biogenic tank-to-wake (TTW) carbon dioxide emissions are reported separately from Scopes 1, 2 and 3, consistent with current guidance from the GHG Protocol.(a)