The Directorate General of Civil Aviation has ordered that if a flight does not initiate takeoff within five minutes of the Air Traffic Control (ATC) clearance, it will be moved to the end of the queue. The Order of the aviation watchdog said that such flights will be allowed to depart only when a slot is available.<br/>'<br/>The move is likely to penalise airlines with poor on-time performance and will ensure that those with a better record do not suffer. It will help prevent a ripple effect on operations if a flight gets delayed.<br/> '<br/>The airports in Delhi and Mumbai are facing severe constraints and have not been able to accommodate new flights during peak hours due to unavailability of slots.