Missing a flight in a dream typically reflects the fear of a chance slipping past you while you're still getting ready for it -- feeling one step behind a deadline, a decision, or a version of your life you thought you'd have reached by now. The frantic run through the terminal is usually the real feeling on display.
Understand the simple qualities of the Planets, for from thence thou shalt know all their mixt significations. - William Lilly (1602.-1681.)