Related Clues:

• Flying letters
• SFO posting
• Socratic "H"
• Socratic H
• Airline sched. datum
• Aristotle's H
• Incoming flight: Abbr.
• 11-Across posting
• In-flight info: Abbr.
• Airport info.
• LAX posting: Abbr.
• E.T.A. part: Abbr.
• Sched. notation
• Expected taking-off hr.
• Train schedule abbr.