Japan Airport Crash 'Number One' expression was mistaken for takeoff permission.

In January, an air-period collision and fire accident at Haneda Airport in Tokyo, Japan, was found to have been caused by the captain of the Korea Coast Guard's aircraft mistaking the controller's expression of "number one" for permission to take off.

Japan's Transportation Safety Board announced the results of its interim investigation.

The head of the Maritime Security Administration's aircraft, which collided with a landing Japanese Airlines plane, stated to the controller that he thought he should enter the runway when he was told to move to the front of the runway and "number one," which means the order of takeoff.

After the controller's order, it was confirmed that the aircraft captain and the deputy chief of the Maritime Security Administration reviewed the instructions together and said there was no problem with each other.

In addition, it was analyzed that the accident occurred due to the fact that both the controller and the Japanese Air pilot did not notice the movement of the Maritime Security Administration aircraft.

The Haneda Airport plane crash on January 2 occurred when a Japanese Airlines plane trying to land and a Maritime Security Administration plane trying to take off entered the runway together.

All 379 passengers on the Japanese Air flight escaped safely, but five out of six passengers on the Air Security Administration aircraft died.