United Airlines Flight 175

United Airlines Flight 175 was a passenger plane hijacked and flown into the South Tower of the World Trade Center in New York City during the September 11, 2001 terrorist attacks. The flight originated from Boston and was hijacked by terrorists as part of coordinated attacks. The impact caused a massive fire and structural failure, leading to the building's collapse later that day. The attack resulted in nearly 3,000 deaths, significantly impacting global security policies and leading to widespread changes in airline security procedures worldwide.