Almost 3,000 people died that day when other airplanes were flown into New York's World Trade Center and the Pentagon in an attack planned by al-Qaida leader Osama bin Laden.
President Donald Trump and his wife, Melania, are at a memorial in Pennsylvania for those killed in the september 11 terrorist attacks and have walked to an overlook to see the field where Flight 93 crashed to the ground.
Commemorating the 17th anniversary of the attacks that struck the World Trade Center in NY and the Pentagon in Washington, Trump said the nation shared the grief of the family members whose loved ones were lost that day.
Relatives of victims read out the names of the dead, and moments of silence were observed at 08:46 and 09:03 to mark the times when passenger jets struck the two skyscrapers.
Standing within the self-discipline the attach the last of the 11th of September planes crashed, President Donald Trump praised the "band of heroic patriots" who helped bring down the jetliner and saved the lives of endless others within the nation's capital.
He said the 40 passengers and crew on United Flight 93 embodied heroism when they fought back against the hijackers.
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The Tribute in Light is seen in the sky above Lower Manhattan area of NY from across the Hudson River on the 17th anniversary of the Sept. 11 terror attacks, Tuesday, Sept. 11, 2018, in Jersey City, N.J.
He was joined in remembrances by first lady Melania Trump, Pennsylvania governor Tom Wolf and former governor Mark Schweiker, who was the state's lieutenant governor on 9/11.
Trump noted that almost 7,000 service members have died since September 11 and - using terminology avoided by his predecessors - said they were "facing down the menace of radical Islamic terrorism".
It's not surprising that Donald Trump (who, yes, is actually our president) embarrassed himself on 9/11 today. "First responders are still dying and being ill", Chaundera Epps said, adding, "God bless America that's never, ever, stopped being great".
Trump recognized the almost 7,000 service members who died since 9/11 facing "radical Islamic terrorism" and promised he would do everything he could to prevent another attack on American soil.
It's 93 feet tall featuring 40 wind chimes, and the sound changes with the wind, making what the architect calls a "living memorial". "We must never forget the heroes that sacrificed here", Schweiker said.
Trump and his wife, Melania, arrived at the airport in Johnstown on Tuesday shortly after the time that hijackers flew an airplane into New York's World Trade Center on September 11, 2001, and the Pentagon.