Related Clues:

• Schedule-slot abbr.
• Awaiting scheduling, initially
• Placeholder on a sched.
• Not yet determined: Abbr.
• Sched. uncertainty letters
• Up in the air, for short
• Unknown time letters
• Not yet filled, in a sched.
• Awaiting scheduling: Abbr
• 'Details forthcoming': Abbr
• TV schedule abbr
• "I'll tell you later," TV Guide-style
• Sched. slot notation
• Not yet decided: Abbr
• Itinerary abbr