Willie Walsh, Director General of the International Air Transport Association, which includes most of the world's major airlines, called for swifter action in Europe to drive up scarce production of greener Sustainable Aviation Fuel (SAF).
Air fares have already jumped this year as a result of higher prices for conventional fossil-based jet fuel.
Environmental groups argue that air higher travel costs will help to rein in emissions by curbing growth in traffic.
In July, the European Parliament backed rules on aviation fuel that set binding targets for the replacement of kerosene with less polluting sources, while extending the definition of what a green fuel could be.
This year's U.S. Inflation Reduction Act includes significant subsidies to the SAF industry in the form of tax credits, but European industry leaders including the head of planemaker Airbus (AIR.PA) have said the legislation is unfair.