CHIANG MAI – A Royal Thai Air Force AT-6 light-attack aircraft crashed in the Chom Thong area of Chiang Mai. The AT-6 is part of a newer fleet brought into service by the Royal Thai Air Force. Royal Thai Air Force (RTAF) operated the T-6 TexanThe North American Aviation T-6 Texan is a well-known name in aviation history. In Thailand, the Royal Thai Air Force (RTAF) flew the T-6 Texan under the local designation B.F8 (บ.ฝ.๘) from 1948 to about 1974. In the early 1960s, Thai crews also used attack-configured T-6 Texans to support operations tied to the conflict in Laos.