LAST EDITED ON 10-19-05 AT 03:24 PM (EST)I just did a quick read thru on the episode guide and there was no indications to why he was on the plane.
I thought maybe he was escaping Saddam's regime but he already said Saddam would kill his family. Unless he fled after Saddam was captured because he himself would have been wanted as a soldier of Saddam.
Or if we assume the story takes place years before then the Saddam being captured plot wouldn't work.
Call me stumped. Don't know.
ETA - But I knew there would be someone along to enlighten.

Slice and Dice Chop Shop 2005
LAST EDITED ON 10-19-05 AT 03:33 PM (EST)He was on the plane because he complied with the CIA's demands and they gave him a rough idea of where Nadia was (LA) and a plane ticket to get him there.
Actually, they gave him an earlier flight, and he pushed for a later one (flight 815) so he could bury his friend.
(ETA: This is all from "The Greater Good" episode, should you have access to Season 1 eps.)
Fester