Orient Thai Airlines and its now-defunct wholly owned domestic carrier One-Two-GO Airlines are the only Thai airlines to bear a royal seal, made possible by Udom's <<who?>>close relationship with the King of Thailand, based on Udom's history of breaking traditional commercial barriers for Thailand. Prior to their current location, Orient Thai and its subsidiary One-Two-GO were headquartered in Don Mueang District, Bangkok.
On 22 July 2008, shortly after the crash of One-Two-GO Airlines Flight 269 in Phuket which killed 89 people, and after the Internet publication of illegally excessive work hours and check ride fraud, Orient Thai and One-Two-GO were ordered to suspend service for 56 days.
On 22 September 2010, Orient Thai took delivery of its first Boeing 747-400 aircraft, previously registered as N548MD, and arrived at the Orient Thai base as HS-STC.
On September 2004, an Orient Thai 747 mistakenly flew within 200 meters of Japan's Tokyo Tower over the heart of downtown Tokyo.
On 31 July 2013, a chartered Orient Thai 737-400 operating as OX833 made an emergency landing at Surat Thani airport, carrying Chinese passengers from Shenzhen to Phuket. None of the 130 passengers and nine crew was injured.