Related Clues:

• Late guest's guess, for short
• Train station datum: Abbr
• It may be affected by traffic, in brief
• It's within three other Greek letters
• Bus sched. approximation
• Traffic-sensitive stat
• When a plane should land, briefly
• Info on an airport monitor, for short
• Guess at Sea-Tac
• When you're supposed to get there, for short
• H, for a sorority
• When you should get in: Abbr
• Transit stat
• One of four rhyming Greek letters
• Letter after 53-Across