Jill Biden marks 9/11 anniversary in Pennsylvania
STORY: "This is the legacy we must carry forward: hope that defies hate, love that defies loss," she said.
Nearly 3,000 people died in the attacks, when al Qaeda hijackers flew planes into the New York's World Trade Center towers and into the Pentagon in Arlington, Virginia, while a fourth plane crashed in Pennsylvania.
Passengers on United Airlines Flight 93 overcame the hijackers and the plane crashed in a field, preventing another target from being hit.
Biden also met with members of the Association of Flight Attendants-CWA at the memorial, hugging some of them.
