An innovative aircraft that turns into a "lighter-than-air" balloon to propel itself forward has been flown for the first time.
원문출처 : https://www.cnn.com/travel/article/phoenix-aircraft-test-flight-scli-gbr-intl/index.html
원문출처 : https://www.cnn.com/travel/article/phoenix-aircraft-test-flight-scli-gbr-intl/index.html