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Then going down to 23,000, then back up to 30,000, then flying for several hours. what do you make of that? well, it s interesting from an aerodynamic standpoint. the surface ceiling of the airplane is 41,500. if the plane is up at 45,000 feet, the margin between overspeeding the aircraft getting into what s sometimes called mach tuck going way too fast for the airplane and stalling the airplane becomes very, very small. you re up there in a very dangerous situation. the airplane is likely to come down on its own accord at that point. it can t sustain flight there. we talked about the stability of the airplane. most airliners are very stable. what could describe that flight path is something that pilots refer to as a fugoid where the nose is seeking a trimmed position. it s sort of like making a paper ....