A passenger opened a door on an Asiana Airlines flight that later landed safely at a South Korean airport on Friday, airline and government officials said.
Some people on board tried to prevent the person from opening the door, but it eventually opened partially, the Transport Ministry said.
The plane with 194 people was en route to the southeastern city of Daegu from the southern island of Jeju. The flight is normally one hour, and it was not immediately disclosed how long the gate was open.
Police detained the unidentified person who opened the door, the airline said. The reason for her was not immediately known.
The passengers included teenage athletes planning to attend track meets in Ulsan, another southeastern city.
The incident terrified some passengers but no one was injured, although some passengers were being evaluated at a hospital, Asiana and Transport Ministry officials said.