Apron capacity ATC Restriction Curfew Gate capacity High security flight restriction Misuse of slots Night allocation Noise ban No recognizable period Post SCC coordination for ad hoc Runway congestion Terminal congestion Unable to allocate slot for miscellaneous reason Request put on waiting list Apron congestion 10 minutes Apron congestion 15 minutes Apron congestion 2hours Apron congestion 30 minutes Apron congestion 3 hours Apron congestion 60 minutes No 80% use of slots Runway 5 minute limitation Runway 10 minute limitation Runway 15 minute limitation Runway 30 minute limitation Runway 60 minute limitation Security Terminal congestion 10 minutes Terminal congestion 15 minutes Terminal congestion 2 hours Terminal congestion 30 minutes Terminal congestion 3 hours Terminal congestion 60 minutes