Thailand will increase its international passenger service charge by more than 50% starting June 20, affecting travellers at six major airports operated by Airports of Thailand (AOT). The change will apply only to outbound international passengers. Fee rises at six major airports The revised charge will be implemented at: Suvarnabhumi Airport Don Mueang International Airport Chiang Mai International Airport Mae Fah Luang Chiang Rai International Airport Phuket International Airport Hat Yai International Airport The departure fee will rise from 730 baht to 1,120 baht, according to the Bangkok Post . Revenue to fund airport upgrades AOT said the additional revenue will be used to upgrade airport infrastructure, including expanded passenger terminals, automated check-in systems (CUPPS), and improved safety technology.…