Airports of Thailand Plc (AoT) has fixed a security flaw which enabled people without proper clearance to enter restricted areas at airports.
The new no-photo-no-entry rule became affective on July 1 and applies to AoT-owned airports countrywide, including Suvarnabhumi and Don Mueang.
The move follows an incident on March 8, when a man was allowed enter a prohibited area at the Suvarnabhumi airport terminal and wait there for a friend by just showing a permit he obtained from an official of a state agency.
The permit did not have a photo of the holder.
The intruder broadcast his presence live on Facebook, showing himself in a cheerful mood.
His exposure raised doubts about safety at airports nationwide.
"We've already cancelled all licences," AoT president Nitinai Sirisamatthakarn said on Thurday. Only people with new permits that include the holder's photo were being allowed entry passes to restricted areas.
People who are allowed entry to these zones include AoT employees, airline staff and state officials assigned to work at the airport, he said.