President George W. Bush tours the crisis management center with Transportation Secretary Mary Peters, after delivering his remarks on aviation congestion and transportation safety, Tuesday, Nov. 18, 2008, at the Transportation Department in Washington. (AP Photo/Ron Edmonds)

President George W. Bush listens to Transportation Secretary Mary Peters speak, before he delivered his remarks on aviation congestion and transportation safety, Tuesday, Nov. 18, 2008, at the Transportation Department in Washington. (AP Photo/Ron Edmonds)

Transportation Secretary Mary Peters makes remarks after reviewing fuel efficient vehicles, Tuesday, April 22, 2008, at the Transportation Department's Turner-Fairbank Highway Research Center in McLean, Va. (AP Photo/Lawrence Jackson)

Transportation Secretary Mary Peters sits in a vehicle at the Transportation Department's Turner-Fairbank Highway Research Center in McLean, Va., Tuesday, April 22, 2008 during a news conference to discuss fuel economy. (AP Photo/Lawrence Jackson)

Transportation Secretary Mary Peters enters a vehicle at the Transportation Department's Turner-Fairbank Highway Research Center in McLean, Va., Tuesday, April 22, 2008, during a news conference to discuss fuel economy. (AP Photo/Lawrence Jackson)

Transportation Secretary Mary Peters makes remarks after reviewing fuel efficient vehicles, Tuesday, April 22, 2008, at the Transportation Department's Turner-Fairbank Highway Research Center in McLean, Va. (AP Photo/Lawrence Jackson)

Transportation Secretary Mary Peters speaks during a news conference at the Federal Aviation Administration in Washington, Friday, April 18, 2008, to discuss aviation safety and travel disruptions. (AP Photo/J. Scott Applewhite)

Transportation Secretary Mary Peters arrives for a news conference at the Federal Aviation Administration in Washington, Friday, April 18, 2008, to discuss aviation safety and travel disruptions. (AP Photo/J. Scott Applewhite)

Transportation Secretary Mary Peters, left, accompanied Federal Aviation Administration (FAA) Acting Director Bobby Sturgell. speaks during a news conference at the FAA in Washington, Friday, April 18, 2008, to discuss aviation safety and travel disruptions. (AP Photo/J. Scott Applewhite)

Transportation Secretary Mary Peters, left, accompanied Federal Aviation Administration (FAA) Acting Director Bobby Sturgell. speaks during a news conference at the FAA in Washington, Friday, April 18, 2008, to discuss aviation safety and travel disruptions. (AP Photo/J. Scott Applewhite)