United Airlines announced a deal to buy 15 supersonic jets, planning to carry passengers on the ultra-fast planes by 2029.
원문출처 : https://www.cnn.com/2021/06/03/investing/united-supersonic-flights/index.html
원문출처 : https://www.cnn.com/2021/06/03/investing/united-supersonic-flights/index.html