Overview: A DC-9 lines up for a nighttime landing at Zurich's Kloten Airport. Although the pilots can't see the runway, their navigation instruments indicate the plane is locked onto the proper signal from the airport. But the equipment is wrong. The plane is actually flying more than a thousand feet lower than it should. Discover the series of errors that caused Alitalia Flight 404 to plow into the ground six miles short of its destination.