Alan Durand was a spy for Edward Fyers. He had shown to be quite proficient in terms of air radio terminology.
Edward Fyers' operation on Lian Yu
Oliver found Alan in a cave, and Alan begged Oliver to help him. He explained that his class was shipwrecked on Lian Yu, and he'd been beaten by soldiers before having gotten away. However, Oliver suspected him of being a spy and left him for dead.
Oliver's suspicions were later confirmed when Alan called for a Ferris Air jet carrying cargo to China to be rerouted in order for it to be destroyed by missiles on Lian Yu. When Oliver managed to free himself, he stabbed Alan, who then got his neck snapped by Shado.