It's still at the conceptual stage, but a brand new supersonic airplane design unveiled this week by Lockheed Martin Aeronautics could be the clearest indication yet that we're on the brink of a new golden age of super-fast air travel.
원문출처 : https://www.cnn.com/travel/article/supersonic-airplane-qsta-lockheed-martin/index.html
원문출처 : https://www.cnn.com/travel/article/supersonic-airplane-qsta-lockheed-martin/index.html