A private jet reportedly used to help a Chinese mafia boss escape arrest and flee the country is at Bo Fai airfield in Prachuap Khiri Khan and never left Thailand, according to the air force.

Former massage parlour tycoon Chuwit Kamolvisit provided information about the alleged escape to police on Thursday.

Mr Chuwit claimed the alleged gangster, who he named as Mr Tuhao, had already fled the country, with the assistance of some state officials, on the jet hours after police raided a pub in Bangkok's Yannawa district late last month.

Chuwit also claimed that the jet was kept at the Civil Flying Training Division, known as Sunny 604, which is under the supervision of the air force.

An air force spokesman said the jet had flown to Bo Fai airfield for maintenance.

The aircraft left Don Mueang airport on Oct 29 at 9am without a passenger on board for Bo Fai airfield in Hua Hin district. The jet has remained there since then and was not used to help the alleged gangster flee, he said.

Mr Chuwit said that the Chinese gangster purchased the aircraft from a politician in Nakhon Ratchasima.

He questioned why the man was allowed to keep his jet at Sunny 604, which is reserved for members, noting that Mr Tuhao was not a member.