A History of Short Words

From the New York Times Crossword Puzzle

ETD

Thu, 23 Feb '23
Guess posted at a gate, in brief
Fri, 2 Dec '22
Flight abbr.
Sun, 30 Oct '22
When you should be off, in brief
Sun, 8 May '22
When you should leave, for short
Sun, 4 Jul '21
Airport info, for short
Sun, 27 Dec '20
Train ticket info, for short