Exiled Cambodian Prince Norodom Sirivudh, who is accused of plotting to kill his country's co-premier, was stranded in the territory last night.
Dragonair refused to let him board a flight to Phnom Penh amid alleged threats to put the aircraft 'in danger'.
Prince Sirivudh was issued with a boarding pass by the airline on his arrival in the territory from Europe yesterday morning and had hoped to fly on later in the day.
But three hours before the take-off at around 4 pm, Dragonair banned him from boarding saying the Cambodian Government had told them he did not have valid travel documents and would not be allowed into the country.
Prince Sirivudh, 45, has served as a deputy prime minister and minister of foreign affairs in the current Government. He is a half-brother of King Norodom Sihanouk and an uncle to First Prime Minister Prince Norodom Ranariddh.
Last night the prince was understood to be still inside Kai Tak airport's transit area as officials tried to broker a deal to fly him to Phnom Penh on a Royal Air Cambodge flight tomorrow.