Answer: ETAS

AnswerCrossword Clue
ETASFrat letters
ETASGreek H's
ETASItinerary data, for short
ETASHippocratic H's
ETASSome Rosetta Stone letters
ETASJFK predictions
ETASBrief guesses?
ETASLAX info
ETASLetters after zetas
ETASSFO postings
ETASTouchdown data
ETASSchedule figs.
ETASJFK list
ETASLAX list
ETASLetters from Thessaly
ETASAnnouncements from the cockpit, briefly
ETASTouchdown data, briefly
ETASFlight deck forecasts, briefly
ETASTerminal info
ETASHeadwinds may affect them, briefly
etasETA, a Greek letter
ETASFlight data, briefly
ETASGreek vowels
ETASLetters from Greece
ETASJFK postings
ETASPilots' announcements, familiarly
ETASPilots' announcements, for short
ETASSweater letters
ETASGreek letters
ETASLAX postings
ETASGuesses from the cockpit
ETASFraternity letters
ETASHellenic vowels
ETASArr. projections
ETASLogan postings
ETASThey look like aitches
ETASHs in Athens
ETASLogan info
ETASLogan stats.
ETASInfo from schedules