On the 3rd of June, the Denver-based aerospace start-up Boom celebrated its first order of up to 50 supersonic aircraft made by United Airlines, promising a strong comeback for ultrafast jets. Introducing the United supersonic fleet. @United will purchase up to 50 Overture airliners and fly the fleet on 100% sustainable aviation fuels. https://t.co/zVG2aMCVKx #BoomSupersonic pic.twitter.com/kg9eoFT2Ww — Boom Supersonic (@boomaero) June 3, 2021 As soon as news of the new ...