Crossword Genius

When an airplane is due in: Abbr (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "when you can hope to receive it" , "Greek H" , "character abroad?" , "Something like 10 [RHO]" , "European separatists, initially" .)

I've seen this clue in the Newsday.
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