Moving big stuff across treacherous terrain can be dangerous and expensive, and innovators are always looking for new solutions.
원문출처 : http://www.cnn.com/2016/07/22/aviation/future-of-aviation-cargo-airlifting/index.html
원문출처 : http://www.cnn.com/2016/07/22/aviation/future-of-aviation-cargo-airlifting/index.html