A new era of supersonic flight might be just around the corner, but there are three challenges to overcome when it comes to flying faster than the speed of sound.
원문출처 : https://www.cnn.com/travel/article/when-will-supersonic-flight-return/index.html
원문출처 : https://www.cnn.com/travel/article/when-will-supersonic-flight-return/index.html