According to the  rental service agreement between Aeronautical Radio of Thailand (AEROTHAI) and Airport of Thailand Public Company Limited (AOT), during 22 – 25 November 2021, the Radio Communications System Services Department has installed an Air to Ground Radio Communication System for 15 mobile units operating around the parking bay and the airside at Suvarnabhumi International Airport in accordance with Civil Aviation Authority of Thailand (CAAT) recommendation mentioned that the radio frequency channel for pilot and airport for communicating in case of emergency shall be arranged by airport organization.