Cathay Pacific 
The airline said no passengers or crew were injured and the flight landed safely early on Thursday. The incident is now being handled by the city's police force. Hong Kong's police department did not immediately respond to a request for comment.
"Our cabin crew immediately attended to the situation, inspected the door to ensure it was securely closed, and reported the incident to the relevant authorities and the police," Cathay said.
"The case has been handed over to the police for investigation. At Cathay, the safety of our customers and crew guides every decision we make."
The South China Morning Post identified the passenger as a 20-year-old mainland Chinese man. Reuters was not able to independently verify the passenger's identity.
(Reporting by Farah Master; Editing by Tom Hogue)