Airports of Thailand, the operator of Hat Yai International Airport, has strengthened its security measures following security breach yesterday.
AOT President Makin Petplai said that after the incident with a Nok Air flight, the security system has been reviewed.
Without a ticket, a passenger boarded Nok Air's Flight DD 7105 from the provincial airport.
Makin said that there was a discussion with airlines operating from the airport.
He added that the number of officers tasked to screen tickets and passengers' IDs is increased. Officers in the CCTV rooms at all airports are told to monitor the premises thoroughly and file reports to the security centre every 30 minutes.
Officers at the Hat Yai airport have been suspended, pending for further investigation.
AOT regretted for the incident, he said. All airport directors have been told to strictly followed safety measures and the International Civil Aviation Organisation (ICAO)'s regulations.