Related Clues:

• Zeta-theta separator
• Pilot's prediction: Abbr.
• Getting-in approx.
• H, to Socrates
• Letters of uncertainty
• ''Still open,'' on a sched.
• Flight-board info: Abbr.
• Guess at JFK
• Frat's seventh chapter
• Hellene's H
• H, as in Hellas
• Plato's "H"
• Visitor's guess: Abbr.
• ''Unknown,'' on a sched.
• Approx. landing hr.