This year, a new memorial stands in honor of the 40 passengers who were aboard Flight 93 when it crashed into a field in Shanksville.
A total of 2,966 people died in the worst terror attack on U.S. soil when planes were flown into New York's World Trade Center and the Pentagon in an atrocity planned by al Qaeda leader Osama bin Laden.
Thousands of survivors, victims' relatives, rescuers and others gathered on a misty Tuesday at the memorial plaza in NY where the World Trade Centre's twin towers once stood.
Americans have looked back on the September 11 terror attacks with solemn ceremonies and a presidential tribute to "the moment when America fought back".
America's First Couple will visit the newly inaugurated Tower of Voices at the Flight 93 National Memorial - a 93-foot-tall (nearly 30-meter) monument with 40 wind chimes to represent the 40 passengers and crew killed on the flight.
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They "joined the immortal ranks of American heroes", said Trump.
The names are read by victims' loved ones, some of them not yet born when the attacks happened.
How hard is it to write a thoughtful message to the families of those lost in the attack, thank the first responders, encourage America, or at the very very least, not pump your fists? It is believed that the hijackers were hoping to use the plane to attack the Capitol, home to the US House of Representatives and the Senate.
The memorial is called Tower of Voices.
"Today, we remember our beloved fallen, whose names are enshrined at this Pentagon Memorial and will forever be etched in the hearts of the American people for as long as this Nation endures", he tweeted.
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He also paid tribute to his lawyer Rudy Giuliani, who was Mayor of New York City on 9/11, writing: 'Rudy Giuliani did a GREAT job as Mayor of NYC during the period of September 11th.
"A band of fearless patriots turned the tide on our nation's enemies and joined the immortal rank of American heroes", he said.
A member of the military walks the grounds of the National 9/11 Pentagon Memorial before the start of the September 11th Pentagon Memorial Observance at the Pentagon on the 17th anniversary of the September 11th attacks, Tuesday, Sept. 11, 2018.
Trump has sometimes awkwardly assumed the consoler role required of presidents in the course of his year-and-a-half in office.
Tens of thousands of people inhaled fumes in the days after the attack, and the number of patients coming forward with tumours has increased in recent years, according to the fund.
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'His leadership, bravery and skill must never be forgotten.