Manila’s Ninoy Aquino International Airport (NAIA) will reduce flight operations from Nov. 15-20 to upgrade the radar and air traffic management systems.

The Civil Aviation Authority of the Philippines (CAAP) estimates about four flights per hour will be canceled, to about 36 movements an hour.

“The reduction of flights was decided as a safety measure as the old Manila ACC [Area Control Center] radar, which has a limited capacity, undergoes a transition phase to the Communications, Navigation, Surveillance/Air Traffic Management (CNS/ATM) system, which can cover the whole country,” CAAP said in a statement. “The CNS/ATM system is expected to enhance the safety and efficiency of air traffic and airspace management in the country.”

Flag carrier Philippines Airlines has canceled about 37 domestic and 37 international flights. Philippines LCC Cebu Pacific also canceled about 20 domestic and 16 international flights.

The ATM project was partly funded by the Japan International Cooperation Agency and involves establishing a central traffic control complex in Manila and constructing 10 radar sites around the country.

Chen Chuanren,