At LAX, one of the busiest airports in the world, the unthinkable happens. As one plane prepares for takeoff, another prepares to land on the same runway. In 1991, the fatal collision of US Air Flight 1493 and Skywest Flight 5569 sent fear into the hearts of air travelers. How could two aircrafts be assigned to the same runway at the same time? How did the pilots not see the other plane? We go from the control rooms to the cockpit to the tarmac to reveal how this tragedy happened and whats being done to prevent it from happening again.