United Airlines has canceled a planned 9/11 memorial flyover over Denver due to concerns raised by members of the community, according to a statement shared with The Independent. The event was originally scheduled for 9:03 a.m. on Friday, the exact time that United Flight 175 crashed into the South Tower of the World Trade Center in Manhattan on September 11, 2001. The flyover was to be joined by F-15 jets and described as "brief, but potentially surprising if you aren't aware it's happening," according to the city’s Office of Emergency Management. Denver Mayor Mike Johnston had previously announced the event, calling it a "powerful tribute to those we lost and a reminder that their legacy lives on in the strength of our communities and in the people who continue to serve others." United Airlines had stated that the memorial would signify "the honor, resilience and courage that carries us forward," according to a statement from United Capt. Miles Morgan, managing director of United’s Flight Training Center. However, the Office of Emergency Management later announced that the flyover would not take place, stating, "There will be no aircraft flyover associated with the memorial events on Friday, Sept. 11." United Airlines said it would instead commemorate the 25th anniversary of the attacks with events at United’s Flight Training Center and at Denver International Airport, where "hundreds of employees" will attend both memorial events. The airline will unveil a monument built of steel recovered from the World Trade Center to honor the United Airlines crew members aboard Flight 175 and Flight 93. The memorial will stand 9 feet 11 inches tall. United Flight 175 took off from Boston at 8:15 a.m. on September 11, 2001, and was hijacked by five al-Qaeda terrorists, who crashed it into the South Tower of the World Trade Center. Nine crew members and 51 passengers were killed. United Flight 93 left New Jersey roughly 30 minutes later, and after a struggle between passengers and hijackers, it crashed into a field in Shanksville, Pennsylvania, killing seven crew members and 33 passengers. The 9/11 attacks also involved American Airlines Flight 11, which crashed into the North Tower of the World Trade Center, and American Airlines Flight 77, which struck the Pentagon. Nearly 3,000 people died in the attacks, and more than 9,000 people have died from 9/11-related illnesses in the years that followed. At least 49,000 people have been diagnosed with cancers related to the attacks in New York City and their aftermath, according to the 9/11 Memorial.