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A Delta ground operations employee in an orange high-visibility vest holds a hose that connects to the underside of a Delta aircraft on the tarmac at sunset.
A Delta ground operations employee in an orange high-visibility vest holds a hose that connects to the underside of a Delta aircraft on the tarmac at sunset.

Fuel Efficiency

Fuel Efficiency1

MAINLINE + DELTA
CONNECTION		 Metric Defined 2019 2023 2024 2025
Jet fuel (million gallons) Jet fuel from mainline + Connection Carrier operations 4,207 3,926 4,114 3,800
Revenue passenger miles (millions) Number of paying passengers multiplied by the distance they traveled in miles 237,680 224,630 246,145 248,841
Revenue ton kilometers (RTK; millions) Sum of passenger and cargo revenue ton miles, converted to kilometers 41,164 38,337 42,328 42,979
Fuel efficiency (gallons/100 RTK) Fuel efficiency on a payload-mile basis 10.22 10.24 9.72 8.84
Available seat miles (ASM; millions) Number of seats available to sell multiplied by the distance traveled 275,379 262,601 288,394 298,045
Fuel efficiency (gallons/1,000 ASM) Fuel efficiency on a capacity basis 15.28 14.43 14.27 12.75
  1. Totals may not sum due to rounding.(a)