Crossword Genius

Flightboard abbr. (3)

Ross

There are a few possibilities for this:

(Other definitions for eta that I've seen before include "Arrival roughly indicated" , "Basque separatist movement" , "character abroad?" , "when it might reach us?" , "Greek letter - time due (abbr)" .)

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