Gordon Felt front left, President of Families of Flight 93 whose brother Edward was a passenger on Flight 93, walks alongside Secretary of the Interior Ken Salazar as Speaker of the House John Boehner, former President Bill Clinton and former President George W. Bush walk behind as they walk to the stage at the dedication of phase 1 of the permanent Flight 93 National Memorial near the crash site of Flight 93 in Shanksville, Pa., Saturday Sept. 10, 2011. (AP Photo/Gene J. Puskar)

Photo by: Gene J. Puskar

Gordon Felt front left, President of Families of Flight 93 whose brother Edward was a passenger on Flight 93, walks alongside Secretary of the Interior Ken Salazar as Speaker of the House John Boehner, former President Bill Clinton and former President George W. Bush walk behind as they walk to the stage at the dedication of phase 1 of the permanent Flight 93 National Memorial near the crash site of Flight 93 in Shanksville, Pa., Saturday Sept. 10, 2011. (AP Photo/Gene J. Puskar)