
All passengers would go under random baggage check after stepping into the passenger terminals.
Serirat Prasutanond, acting president of AOT, said that the higher alert follows the intelligence reports that the protesters would take control of airports.
AOT operates four international airports in Phuket, Hat Yai, Chiang Mai and Chiang Rai.
While protesters blocked the entrances and exits at Hat Yai Airport, some also blocked the entry into Phuket Airport. There are reports that more protesters are heading towards the Krabi Airport, which is under the supervision of the Civil Aviation Department.
It was reported that more police officers are dispatched to Chiang Mai Airport.