Related Clues:

• Letter from abroad
• Announcement to passengers
• H H H, to Homer
• Forum letter
• Airport posting: Abbr.
• JFK letters
• 7th Greek letter
• Symbol for viscosity
• Metal core?
• In-flight info
• In-flight announcement
• When a plane is due in: Abbr.
• H, in Greece
• Homeric H
• H look-alike