NOVA presents a gripping investigation of what went wrong when two Boeing 747 airliners collided in thick fog on the runway at a tiny airport in the Canary Islands, killing 583 passengers and crew - the worst loss of life in any air disaster. With heart-breaking survivor interviews, re-enactments and a detective story approach, NOVA pieces together the clues that led to a fatal take-off decision by the highly experienced captain of the KLM 747, who couldn't see the Pan Am 747 still parked on the runway, lost in the fog ahead of him. The disaster led to fundamental improvements in air safety, but experts worry that a repeat of the Tenerife disaster could still happen.

Not currently scheduled.