Dedication of Flight 93 Memorial

U.S. Vice President Joe Biden and former Presidents Bill Clinton and George W. Bush are helping dedicate a memorial Saturday near Shanksville, Pennsylvania, where United Flight 93 crashed on Sept.

11.

Forty passengers and crew died on board the aircraft, which plummeted to earth during an onboard struggle to thwart hijackers who had seized the plane.

Crowds gathering for the dedication of a United Flight 93 memorial in Pennsylvania have been slowed by weather-related traffic jams, muddy conditions and security rules but have nonetheless been cheerful as they arrive.

As guests entered the Flight 93 memorial dedication ceremony in Shanksville, Pa., a brass quintet dressed in white Navy uniforms performed solemn songs on stage around a basket of white roses.