Related Clues:
- Sched. slot that's open
- Flight-board info
- Sked stat
- Sorority sweater letter
- Due date, briefly
- Airline abbr.
- Greek 'H'
- Timetable abbreviation
- OINSHRDLU opener
- Seventh of 24 letters
- Sched. spaceholder
- Coming-in approx.
- I ___ Pi (playful fraternity name)
- Terminal msg.
- "We'll let you know," on a TV schedule