If it's the one i think it is, 747 where diverted to an airport in tenerife becuase of a bomb had gone of at their schedualed airport. They had to go up the runway to turnaround for takeoff...
Fogg had coverd the airport and the runway wasant visbale to the tower and mistakes where made by the pilots who both tried to take off from miss-comunication and smacked into each other on the runway.