Dillingham Airfield is also where the wreckage of the relief plane is stored. Eko used this plane to smuggle his drugs out of Nigeria in the Virgin Mary statues, but he was not on board. His brother was dragged onboard after being shot.
The plane later mysteriously crashed on the island. Eko's brother was killed. The Virgin Mary statues filled with heroin survived. It was this plane the fell when being explored by Boone in Season 1, Episode 19 - Deus ex Machina. This resulted in Boone's death shortly thereafter. It is also this plane that covered the entrance to the hatch known as The Swan in Season 2, Episode 21 - ?.
To reach Dillingham Airfield head north through Central Oahu on Highway 99 (Kamehameha Highway). As you approach the town of Haleiwa, bear left on Kaukonahula Road (Highway 930 spur) and then shortly thereafter right onto Highway 930 (Farrington Highway). Dillingham Field will be on your left about a mile or so past the Mokuleia Polo Field which will be on your right.
View a Google map of this Lost location.
View a screenshot of the wreckage from ABC's Lost.