The planes hit the World Trade Center towers on the following floors during the 9/11 attacks:

• The hijacked Flight 11 crashed into the North Tower (1 WTC) between floors 93 and 99 at 8:46 a.m.

• The hijacked Flight 175 struck the South Tower (2 WTC) between floors 77 and 85 at 9:03 a.m.

These impacts caused massive destruction and fires concentrated on those floors, leading to catastrophic damage and loss of life.