Unleaded Fuel Could Be Offered By End Of 2026; Details Remain On Infrastructure, Costs Boulder Municipal Airport could begin offering unleaded aviation fuel by the end of 2026, according to a state-required transition plan that for the first time sets a timeline for moving away from leaded aviation gas. The fuel would be supplied by Journeys Aviation, the airport’s fixed base operator, which provides fueling, aircraft parking, maintenance, instruction and other services. The move is part of a larger state and federal goal to eliminate the last remaining leaded transportation fuel by 2030. City officials say the plan will be updated at least annually as fuel technology and regulations evolve. Boulder’s city-owned airport serves private pilots, researchers and flight instructors operating piston-engine aircraft and gliders.