A undated handout rendering shows a Boom Supersonic Overture aircraft in United Airlines livery. The two companies announced on Thursday, June 3, 2021, that United will purchase 15 of BoomOs Overture airliners.



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Boom Supersonic

United Airlines’ plans to buy 15 supersonic aircraft from startup Boom Supersonic is raising questions about the future of ultrafast plane travel. WSJ speaks with an industry analyst to better understand what’s next for faster-than-sound air travel.

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