The flight took off from Changsha, the capital of southern Human province and was scheduled to arrive at the Beijing Capital International Airport during afternoon 1:00 pm (China's local time). The statement further reveals that the flight crew and passengers all were unharmed.
Some reports suggest the flight attendant was held against her will with a fountain pen but a photo of a craft knife has now emerged as the real weapon used by the passenger.
According to the Civil Aviation Administration of China (CAAC), a man carrying a fountain pen threatened to harm Air China staff members on board the plane, forcing the aircraft's pilots to take action.
It identified the man only by his surname, Xu (徐), and said he was 41 and from Anhua County in Hunan.
"Presently the airport is operating as normal", the group said in a statement.
The airline said in an earlier post that the plane made the unscheduled stop due to "public safety reasons", and that police and civil aviation authorities were handling the situation.
As the channel CGTN, the plane made flight from Changsha to Beijing.
The Xiaoxiang Morning Herald quoted a passenger as saying that the disturbance occurred in the first or business class cabins, but that the curtains separating those sections from economy class were pulled tightly shut. It said it was arranging for another plane to pick up the passengers from Zhengzhou.