AJET

Set to 3 different clues across 4 published puzzles, most often "Leaving on ___ Plane" — The New York Times, Friday, 17 September 2010.

4 letters

Every clue on record, most used first

"Leaving on ___ Plane"2 times
The New York Times — Friday, 17 September 2010
Answer to the riddle "The higher it goes, the less you hear it"once
The New York Times — Sunday, 5 November 2006
"Leaving on___Plane"once
The New York Times — Monday, 18 March 1996