South Korea has received its third Boeing 737-based Peace Eye airborne early warning and control (AEW&C) aircraft.
The aircraft was delivered to the South Korean air force base at Gimhae, where the type will be stationed, Boeing said in a statement.
This is the second aircraft to be modified by Korea Aerospace Industries (KAI) at its Sacheon facility - the first was modified by Boeing.
The last aircraft is being modified by KAI, with delivery scheduled for the end of 2012.
The type is also operated by Australia, which has five aircraft. Turkey will receive its first example this year.
The Peace Eye is based on the 737-700 airliner.
"The mission crew can direct offensive and defensive forces while maintaining continuous surveillance of the operational area," said Boeing.