Thailand
The Royal Thai Air Force's 602 Royal Guard Squadron operates a Boeing 737-800 for the Royal family flight.
The Royal Thai Air Force's 402 Royal Guard Squadron, a helicopter unit, uses Bell 412STs for Royal flights. The helicopters are expected to be replaced, as they are approaching the lifetime limit for VIP duty. The replacement for these helicopters are Sikorsky S-92 Superhawk.
Although available upon their request, members of the royal family usually fly on commercial flights operated by the national carrier, Thai Airways International, when traveling outside of the kingdom.
Thai government operates one Airbus A340-500, one Airbus A319CJ, and two Embraer ERJ-135LR as the government transport which maintain by Thai Airways International except the Embraer which maintain by Royal Thai Navy.
Read more about this topic: Air Transports Of Heads Of State And Government