wtc on Instagram: "Raw video by WNBC-TV Chopper 4. Videographer: April Amonica Video shows Flight 175 hitting the South Tower of the World Trade Center. United Airlines Flight 175 was the second plane hijacked on September 11, 2001, and it crashed into the South Tower of the World Trade Center. The aircraft, a Boeing 767, struck the building between the 77th and 85th floors. The impact caused the South Tower to collapse 56 minutes later at 9:59 a.m. United Airlines Flight 175 carried 65 people o