In 1996, at Quincy Regional Airport in Illinois, United Express Flight 5925, a Beechcraft 1900 twin turboprop, collided on landing with another Beechcraft, a private King Air, that was taking off from an intersecting runway. Why did the fiery collision turn to tragedy, causing all twelve on board the 1900 and two on board the King Air, to perish when they were unable to escape the burning aircraft?

On July 6, 2013, when Asiana Flight 214 crashed after striking the seawall short of the runway on final approach into San Francisco, it shook the world and the investigation proved to be just as dramatic. It was the first crash of a Boeing 777 that resulted in fatalities since that aircraft model entered into service in 1995.

In October 1992, El Al Flight 1862, a cargo jet heading from Amsterdam to Tel Aviv suddenly begins rolling violently just seven minutes after takeoff. The pilots struggle to turn the crippled plane back towards the airport, but minutes before landing, another sudden roll sends the aircraft plummeting to Earth and straight into a high-rise apartment complex. 43 die in the crash and a nation demands answers. Investigators search for a cause of the Netherlands' worst ever airline disaster. What they find is a potentially lethal problem threatening every 747 in the sky.

What caused Garuda Flight 200 to slam to the ground and careen off the runway in Yogyakarta, Indonesia? Was it a powerful downdraft? Was there something wrong with the wing flaps? Or did a baffling decision by the pilot lead to the death of 21 people? Join us as we investigate the crash of March 7, 2007, through actual video captured at the scene and testimony from a heroic passenger who survived the disaster. Then see how the investigation led the troubled airline to overhaul its training and safety protocols.

In September 2010, shortly after taking off from Dubai, UPS Flight 6 catches fire. With flames spreading throughout the main deck, the pilots make a desperate attempt to return to the airport for an emergency landing. But critical systems are failing, the pilot has collapsed, smoke is filling the cockpit, and the first officer cannot see his instruments. The only way to land is to improvise an emergency procedure, but shaky communications with controllers and poor visibility inside and outside the plane will make for a nearly impossible landing.

Not far from Congonhas Airport, a Sao Paulo neighborhood is in flames. It's a scene of devastation caused by TAM Airlines Flight 3054, a plane that crashed just seconds after takeoff in July 2007. With a shocked nation watching, investigators from the Brazilian Air Force join forces with the National Transportation Safety Board to learn what happened. After combing through more than a hundred parameters in search of a lead, they determine a series of malfunctions caused the accident, coupled with a mechanical failure so rare that pilots had received no training for it.

Just seconds after taking off from Madrid International Airport, Spanair Flight 5022 rolls to the right and slams into a riverbank beside the runway. In spite of the massive rescue effort, only 18 of the 172 people on board survive. Spain quickly recruits an international team of experts to investigate this puzzling disaster. How could a sophisticated jet, manned by an experienced crew, crash on takeoff? A long preflight delay, an airline in financial trouble, and a blazing August afternoon in 2008 may help provide the answer.

The 1991 crash of Atlantic Southeast Airlines Flight 2311 to Brunswick, Georgia claims the lives of a NASA astronaut and a former U.S. senator and becomes an international media sensation. Commuter planes like this twin-turboprop aircraft aren't required to carry flight recorders, so investigators must rely on physical evidence to find the cause of the disaster. The strange angle of one of the propeller blades seems to offer an explanation, but in order to prove the detectives' theory, they'll need to take a huge and potentially lethal gamble.

A routine landing in October 2006 on the Norwegian island of Stord turns fatal for Atlantic Airways Flight 670 when the commuter plane skids out of control, off the runway, and down a steep cliff. With several exits blocked, and the plane engulfed in flames, 16 people onboard scramble to escape. Revisit the harrowing crash, and follow investigators as they search for possible causes for the disaster, from a slight tailwind to a wet runway to a hidden flaw in the plane's design.

It's 1961. Air traffic controllers and local dignitaries in Ndola, Africa await the arrival of UN Secretary General Dag Hammarskjold, flying in on a top-secret peace mission. But the plane never arrives, and is found the next morning crashed and burning just a few miles from the airport. For decades, conspiracy theories have suggested that the plane was shot down. Now, startling new claims from a former U.S. intelligence officer have triggered a new investigation to get to the bottom of this controversial, decades-long aviation mystery.