KHON KAEN: Khon Kaen airport resumed its services on Sunday morning after flights were cancelled on Saturday night due to a failure in the runway lighting system, airport general manager Atthaya Larpmak said on Sunday. Pilot Officer Atthaya said that after NokAir Flight DD725 (Khon Kaen-Chiang Mai) departed at 7pm on Saturday, the airport’s air safety personnel examined the runway and other systems and found the runway lighting system had malfunctioned. The flight control tower and other offices were informed of the system failure. The following night flights were subsequently cancelled for sa…