SCHED

Set to 3 different clues across 3 published puzzles, most often “Part of an I.R.S. return: Abbr.” — The New York Times, Wednesday, 3 August 2005.

5 letters

Every clue on record, most used first

Part of an I.R.S. return: Abbr.once
The New York Times — Wednesday, 3 August 2005
Flight board, e.g.: Abbr.once
The New York Times — Monday, 12 June 2000
Bus station posting: Abbr.once
The New York Times — Monday, 27 January 1997