MONTREAL/SINGAPORE (Reuters) – A U.S. push for new global standards to kickstart its fledgling supersonic jet industry is facing resistance by European nations that want tough rules on noise, according to documents and people familiar with the situation.

Fifteen years after Concorde’s last flight, U.S. regulators are weighing rule changes to allow testing of early-stage supersonic jets, amid plans for American-made business and small passenger jets due in service by the mid-2020s. But the new industry could face delays at the United Nations aviation agency where the United States and European countries – including France, Germany and Britain – are squaring off over new noise rules needed for the jets to fly, five sources told Reuters, speaking about confidential talks on condition of anonymity.

The previously unreported dispute follows a 1990s clash on noise standards, when the European Union wanted to ban noisy older U.S.-made jets like the Boeing 727 from its airports and Washington threatened to retaliate by banning the Anglo-French Concorde.

This latest round pits U.S. ambitions for an American-led revival of supersonic jets by start-ups Aerion Supersonic, Boom Supersonic and Spike Aerospace against European fears of disruptive noise from the planes. Aerion, backed by Lockheed Martin Corp and GE, is considered by industry sources as the most advanced of the supersonic projects.

Boom will be making its first appearance at the Farnborough Airshow next week as it looks to cement the revival of the supersonic industry, which is struggling to design jets that meet current subsonic noise standards due to engine constraints.

“The politics are that Europe is way more worried about noise (around airports),” said an industry source familiar with the matter. “Europe has a problem but they have no reason to solve (it) because they have no industry pushing for this.”

That’s a reversal of disputes which delayed the beginning of Concorde’s transatlantic services in the 1970s, as first the U.S. Congress and then the New York Port Authority banned it due to noise. The Federal Aviation Administration (FAA) has banned supersonic flights over U.S. land since 1973.

For now, the new jets plan to stick to over-water routes, though the FAA will eventually decide whether to allow overland flights after analyzing data from NASA in a study by 2025. An FAA spokesman couldn’t immediately comment.

Reuters