If you're looking for the cockpit of Oceanic Flight 815, you won't find it at Dillingham Airfield. Since the cockpit was found deep in the rainforest of the island of Lost, the cockpit was taken to the other side of the island near Kane'ohe.
Here, somewhere in the rainforest of Windward Oahu, the plane was hung in a tree for the scene in the Lost Pilot in which Charlie, Jack and Kate stumbled across the cockpit - only to find the pilot still alive. Suddenly "the monster" pulled the captain out by the window and both disappeared into the rainforest. The cockpit of the plane is being stored in a fenced in lot on the mauka or mountain side of the Kamehameha Highhway (836) just north of the He'eia Kea Boat Harbor in Kane'ohe.
View a Google map of this Lost location.
View a screenshot of the wreckage from ABC's Lost.