SOMERSET — The Flight 93 Advisory Commission is disbanding nearly 11 years after it was created to help develop a national memorial at the site where a hijacked plane crashed in southwestern Pennsylvania during the Sept. 11 attacks.

The 15-member group, appointed by the secretary of the Interior, was commissioned by Congress and signed into law on Sept. 24, 2002, by then-President George W. Bush.

The panel helped plan and design the National Park Service memorial at the site where United Airlines Flight 93 crashed, killing all 40 passengers and crew. A federal investigation concluded four Muslim hijackers likely hoped to crash the plane into the U.S. Capitol but couldn’t when some passengers and crew fought them for control of the aircraft.

The group has met four times a year since being sworn in nearly 10 years ago. Its last meeting will be Sept. 10, the day before the 12th anniversary of the attacks.