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| China investigates why plane dropped more than 6,000m | China investigates why plane dropped more than 6,000m |
| (35 minutes later) | |
| Chinese authorities are investigating why a plane was forced to drop more than 6,500m (21,000ft) due to loss of cabin pressure. | Chinese authorities are investigating why a plane was forced to drop more than 6,500m (21,000ft) due to loss of cabin pressure. |
| The Air China flight from Hong Kong to Dalian lost altitude rapidly and oxygen masks dropped in the cabin. | The Air China flight from Hong Kong to Dalian lost altitude rapidly and oxygen masks dropped in the cabin. |
| The plane then returned to cruising altitude and continued as scheduled. | The plane then returned to cruising altitude and continued as scheduled. |
| There is speculation in local media that crew had been smoking in the cockpit and then mishandled the ventilation system. | There is speculation in local media that crew had been smoking in the cockpit and then mishandled the ventilation system. |
| Chinese aviation authorities are examining both the flight data recorder and the cockpit voice recorder to determine what caused the incident. | |
| Several passengers of the Tuesday flight posted pictures of the dropped oxygen masks on social media. | Several passengers of the Tuesday flight posted pictures of the dropped oxygen masks on social media. |
| According to some people on board, cited on Chinese media, passengers were told to fasten their seat belt and told the plane had to descend. | According to some people on board, cited on Chinese media, passengers were told to fasten their seat belt and told the plane had to descend. |
| If a plane loses cabin pressure, the pilot has to bring the aircraft to a lower altitude to keep crew and passengers safe. | If a plane loses cabin pressure, the pilot has to bring the aircraft to a lower altitude to keep crew and passengers safe. |
| "These planes fly at an altitude that at Mount Everest is called the death zone because of a lack of oxygen," aviation expert Greg Waldron of Flight Global told the BBC. | "These planes fly at an altitude that at Mount Everest is called the death zone because of a lack of oxygen," aviation expert Greg Waldron of Flight Global told the BBC. |
| "So the pilot absolutely has to bring the plane lower. Otherwise, crew and passengers would get unconscious." | "So the pilot absolutely has to bring the plane lower. Otherwise, crew and passengers would get unconscious." |