The airplane crashed nose-first into the South Tower's southern façade at a speed of around 590 miles per hour (950 km/h; 260 m/s; 510 kn), striking through floors 77 and 85 with approximately 9,100 U.S. gallons (34,000 L; 7,600 imp gal) of jet fuel on board. Flight 175 explodes after hitting the South Tower.