Flight Attendant: You know, if you do try and get some sleep, the flight will go a lot faster.
Jack Ryan: I can never sleep on a plane. Turbulence.
Flight Attendant: Pardon?
Jack Ryan: Turbulence. Solar radiation heats the Earth's crust, warm air rises, cold air descends - turbulence. I, I don't like that.
Flight Attendant: Oh. Well, try to get some sleep anyway.