South Korea has asked U.S. aircraft maker Boeing to delay the scheduled delivery of two F-15K fighter jets this month because of the ongoing investigation into the cause of a jet crash last month, the Defense Acquisition Program Administration (DAPA) said Tuesday.

``Two F-15Ks were scheduled to be delivered to the Air Force this month, but we’ve requested Boeing to postpone the delivery until next month as F-15K flights have been suspended since the accident occurred,’’ Lim Jong-choon, an official at the DAPA’s aircraft procurement bureau, told reporters.

He, said, however that the delivery of 14 F-15Ks planned for this year will proceed as scheduled.

Under the $5.5-billion deal struck in 2002, U.S. aircraft giant Boeing started delivering 40 F-15Ks to South Korea last year. One F-15K costs about $105 million.

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