21.   On Saturday, the Air Force was to fly in a system to allow ground controllers at the air base to track and guide planes.

22.   Taxiway signs that guide planes to their takeoff positions were not properly located.

23.   Such controllers are needed to guide planes to target.

24.   Taxiway signs that guide planes to their takeoff positions were not properly located, the report said.

25.   The blaze, later extinguished, left the runways without any lighting to guide planes flying in and out.

26.   The agreement called for the rival Koreas to open a telephone line between their air traffic control centers to guide planes and exchange flight data.

27.   The airport has come under criticism for lacking an instrumental landing system, which helps guide a plane in for landing.

28.   The airport, because it was undergoing an upgrade, had temporarily removed a sophisticated landing system that can help guide the plane to the runway.

29.   The blaze was extinguished, but the damage left the runways without any lighting to guide planes.

30.   The blaze, later extinguished, left the runways without any lights to guide planes flying in and out.