What might have been the target for the 4th plane flight 93 in the American terrorist attacks?

The hijackers of United Airlines Flight 93 had turned the plane around and were heading towards Washington, D.C. The United States Capitol Building and the White House are widely believed to have been possible intended targets. The 9/11 Commission Report cited the actions of the crew and passengers that prevented the destruction of the White House or the U.S. Capitol Building. According to an interview with captured Al-Qaeda mastermind Khalid Shaikh Mohammed as published in The New York Times on September 9, 2002, the target of Flight 93 was indeed the U.S. Capitol. Early speculation also mentioned Camp David, near the town of Thurmont in Frederick County, Maryland, as a possible intended target.