Almost two decades since Concorde retired, interest around supersonic travel has been picking up pace, and several super-fast planes are under development. Airlines seem interested: United has already committed itself to offering supersonic routes as early as 2029.
원문출처 : https://www.cnn.com/travel/article/hypersonic-airplane-hermeus/index.html
원문출처 : https://www.cnn.com/travel/article/hypersonic-airplane-hermeus/index.html