SEVERAL flights at the Ninoy Aquino International Airport (NAIA) were delayed due to a software problem at the Air Traffic Management Center, the Civil Aviation Authority of the Philippines (CAAP) said in an advisory on Monday.

“Traffic coming in and out of Manila is affected,” it said. “Hence, an air traffic management contingency procedure is in place to ensure safety.”

Communication and surveillance at the center were available and unaffected, the CAAP said, adding that only departing flights had experienced longer separation intervals.

Flag carrier Philippine Airlines said it was working to normalize delayed flights and coordinating with aviation authorities on the adjustments of flight schedules.

“With the restoration of Manila radar operations by government authorities, we are working towards normalizing our flight operations,” it said in a statement.

Cebu Air, Inc., which operates Cebu Pacific, said some of its flights departing from and arriving at the NAIA might experience delays.

It said it was working to normalize operations since limited flights had been allowed.

“The Air Traffic Management Center resumed operations at 2:21 p.m. but it will take some time for operations to normalize,” it said in a separate statement. “Please expect delays, cancellations and disruptions for the remainder of the day.” 

AirAsia Philippines said it had received confirmation from airport authorities at 2:40 p.m. that air navigation had resumed.

“AirAsia Philippines guests are advised on multiple flight delays today caused by a software issue of the Air Traffic Management Center,” Steve F. Dailisan, communications head at AirAsia Philippines, said in a statement. — Ashley Erika O. Jose