claim: Flights departing airports in the United States and its territories emitted about one-quarter ( 24% ) of global passenger transport-related CO2, two-thirds of which came from domestic flights.
evidence: In 2018, the US airlines had a fuel consumption of 58 mpg‑US ( 4.06 L / 100 km ) per revenue passenger for domestic flights, or 32.5 g of fuel per km, generating 102 g CO₂  /  RPK of emissions.