Nearly 1,000 flights to and from Indira Gandhi International (IGI) will be cancelled or rescheduled in the run-up to Republic Day parade as airspace over Delhi will remain closed for about two hours every day for over a week.
An estimated 500 domestic flights could be cancelled and as many international flights will be rescheduled due to the restrictions, an airport official said, adding it was being done due to increased traffic and capacity constraints this year.
The airspace over Delhi remains shut for commercial flights due to rehearsals in the days leading to the Republic Day on January 26.
The Airport Authority of India (AAI) has issued a NOTAM or Notice to Airmen informing the airlines that no take-offs or landings would be allowed from or to Delhi airport from 10.35 am to 12.15 pm for nine days between January 18-26, according to airport sources.
IGI witnesses 67 air traffic movement (both take offs and landings) per hour between 8 am to 11 pm everyday. With airspace shut for 100 minutes for nine days, an estimated 1,000 flights will either be cancelled or rescheduled.
"On an average 100 flights will be affected every day. We will accommodate 40 international flights before or after the closure hours.
"Out of the remaining 60, we will try to reschedule some of the flights. So, we could see roughly 50 flights being cancelled each day," said an airport official.
The Delhi International Airport Limited, which operates IGI, says no international flights will be cancelled.
"Keeping in consideration the capacity constraints and to minimise inconvenience to the passengers, Airports Authority of India-Air Navigation Services, several major airlines and DIAL have consulted on various options and jointly agreed that the best and safest course of action is to cancel domestic flights scheduled during the NOTAM period.
"International carriers have been requested to reschedule and not cancel their flights," said a DIAL spokesperson. Airport officials say that while on earlier occasions they were able to reschedule most of the affected flights, severe capacity constraints at IGI mean that it cant be done anymore.
"Since we had spare capacity we were able to accommodate flights either before or after the closure hours. But because we don't have any spare capacity now, these flights have to be cancelled," said a source.
Also, the airspace closure has been extended by two days, as a result the restrictions are in place for nine days instead of seven days.
The airlines were asked to curtail operations for R-day on December 29, when the NOTAM was issued.