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Under the agreement, the airline will purchase 15 of Boom’s “Overture” aircraft once they meet United’s safety, operating and sustainability requirements, with an option for an additional 35 aircraft.
The announcement comes less than two weeks after Aerion’s plans to produce a supersonic business jet faltered due to a lack of funding for production.
Supersonics have come under criticism from environmentalists for burning more fuel per passenger than comparable subsonic planes.
United, which has pledged to reduce its greenhouse gas emissions 100% by 2050, said the aircraft would be optimized to use 100% sustainable aviation fuel (SAF) from its entry to service, projected to be in 2029.
Currently, commercial aircraft engines are certified to fly with 50% of alternative fuel, with the rest using ordinary kerosene, but available supplies fall far short of that level.
Boom’s Overture, a supersonic aircraft with 65 to 88 seats which will be initially priced at business class fares, would cut transatlantic flying time by 50% to about three-and-half hours.
The era of regular commercial supersonic flights ended in 2003 when Concorde, flown by Air France and British Airways, was retired after 27 years of service.
The plane’s noisy sonic boom prohibited it from flying over land routes, and it suffered a double blow with a fatal crash in Paris in 2000 and the downturn in the aviation industry after the Sept. 11, 2001 attacks on the United States.
The return of supersonic jets faces hurdles from regulators like the Federal Aviation Administration (FAA) which must first give approval for them to fly at supersonic speeds over land, along with pressure from groups like airports that want the planes to be no noisier than comparable subsonic aircraft.
United did not disclose any financial details though a spokeswoman said a deal was in place and a deposit had been made.
Earlier, United’s head of corporate development, Mike Leskinen, told The Air Current in an interview that the transaction was not a firm order but it involved United taking the lead on “a real aircraft” project.
A Boom spokeswoman said the order meets the terms of a commercial agreement.
