The Ultimate Cheat Sheet on 롤대리
https://www.evernote.com/shard/s517/sh/e0320373-47e9-462a-9ea6-1495749f6a02/175c2a6329dde3195150d1e6957e4b2f
Constitution flights are a substitute for commercial flights. In 1987 the Civil Aeronautics Board opened charters to the general public and permitted a substantial amount of versatility and competitiveness.