Boeing delivered two more F-15K Slam Eagle fighters to the South Korean air force at Daegu airbase on 30 May.
The aircraft, designated F-15K49 and K50, departed Boeing's St Louis facility in Missouri on 25 May and made stops at Palmdale in California, Hickam AFB in Hawaii and Andersen AFB, Guam, before arriving in South Korea.
Boeing delivered the first six of 21 F-15Ks it is producing under the Next Fighter II contract in 2010 and two more in April. The remaining 11 aircraft will be delivered up to April 2012, said Boeing.
Six of Seoul's new F-15Ks will participate in an advanced aerial combat training exercise at Nellis AFB, Nevada, in early 2012, it added.