NOVA investigates the collision of two Boeing 747 airliners on the runway at a tiny airport in the Canary Islands -- in which 583 passengers and crew died. With heart-breaking survivor interviews and authentic reenactments, "The Deadliest Plane Crash " 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.