Related Clues:

• Schedule abbr.
• Timetable abbr.
• Schedule letters
• As yet unscheduled: Abbr.
• Sched. letters
• Itinerary abbr.
• Not yet decided, on a sched.
• More info later: Abbr.
• Scheduling placeholder
• Not optional: Abbr.
• Necessary (Abbr.)
• Schedule slot letters
• TV sched. abbr.
• TV sked abbr.
• Ambiguous sched. info