Ex-NASA chief Sean O'Keefe, seen in this March 11, 2004 file photo in Washington, was on board a small plane that crashed on August 9, 2010 in rural Dillinham, Alaska. Sen. Ted Stevens (R-AK) was also believed to be onboard the aircraft and it is unknown if there are any survivors. UPI/Roger L. Wollenberg/File

Photo by: ROGER L. WOLLENBERG

Ex-NASA chief Sean O'Keefe, seen in this March 11, 2004 file photo in Washington, was on board a small plane that crashed on August 9, 2010 in rural Dillinham, Alaska. Sen. Ted Stevens (R-AK) was also believed to be onboard the aircraft and it is unknown if there are any survivors. UPI/Roger L. Wollenberg/File