Related Clues:

• MD and others
• When planes are due, for short
• Numbered NYC runners
• Cockpit announcements: Abbr.
• Hellenic H's
• Some guesses, briefly
• Terminal figs.
• Airport-board listings: Abbr.
• Kin of blvds.
• Brief guesses?
• Valentine and Vitus: abbr.
• Station info
• Platonic H's
• ''H'' look-alikes
• Ways around: Abbr.