A Singapore Airlines flight from Changi Airport had to return to make an emergency landing less than an hour after take-off.
The flight, which was bound for France's Paris Charles de Gaulle, had climbed to 24,000 feet and was over Malaysia when it turned back towards Singapore. Oxygen masks were deployed and the aircraft descended to 6,000 feet.
Photos were taken inside the aircraft by a passenger who said they had been transferred to the Singapore Airlines flight after the Air France service they were booked on was cancelled due to technical issues.
"After 45 minutes from take-off, the masks fell. There was no panic on board as everything seemed normal," they said.
"The pilot took a lot of time to give us an update, and the plane dropped fuel for an hour before landing."
Singapore Airlines confirmed the aircraft returned to Changi Airport due to a loss of cabin pressure, saying it landed at 2:30am this morning local time. Using a different aircraft, the flight left at 6am and will arrive in Paris five hours late.
According to data from tracking website FlightRadar24.com, the aircraft involved operated a flight from Auckland to Singapore on September 3. It then appears to have been out of service until a brief test flight of under 20 minutes on November 13, before it re-entered service on Monday morning as SQ336 from Changi to Paris Charles de Gaulle.
Singapore Airlines has been contacted for comment.