Crossword Genius

When a plane is due in: Abbr (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "Member of Greek set a" , "Letter from Doris" , "Arrival roughly indicated" , "Greek letter - time due (abbr)" , "When one is due" .)

I've seen this clue in the Universal and the Newsday.
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