Via Gulliver, an Economist post on the English-distortion field around airplanes:
In general, flying is filled with phrases you’ll never hear anywhere else. You must “deplane”, not just leave the airplane. In a theatre you’re asked to switch your mobile phone off; on an American airline you’re told to put all electronic devices "in the off position”, whatever that is. Carry-on suitcases with wheels apparently became "rollerboards" "roll-aboards" in the mouths of the airline staff at some point. Many of the instructions seem replete with extra verbiage: seats and tray tables in "the full upright and locked position". Flights that are not just full but completely full.
Pat Smith ("Ask the Pilot") complained about this a while ago, but I didn't find the column in four minutes so I'll leave the search up to my loyal readers.