September 1978: A Boeing 727 is preparing to land at San Diego's Lindbergh Airport. The pilots are warned of a prop plane flying immediately ahead of them. The crew confirms that they see the small aircraft, but within minutes, the two planes collide, spiral out of control, and slam into a small neighborhood. The crash claims the lives of 144 people, including 13 victims on the ground. It is one of California's worst aircraft disasters. Join the investigation and see how investigator's findings lead to major changes in aircraft landing procedures across the U.S.