Some of the deadliest air disasters in history have been caused by simple miscommunications. A tiny error in the cockpit brings tragedy to Quincy Airport in Illinois. A moment of confusion turns a routine flight in Sumatra into chaos. And a runway mix-up on the island of Tenerife sends two jumbo jets on a collision course. Watch these disasters unfold and see how safety investigators responded to prevent human misunderstandings from triggering future catastrophes.

Passengers place their lives in the hands of pilots on every flight. While pilots are highly trained to handle a wide variety of emergencies, it is often personal problems like impatience, arrogance, and incompetence that can lead to tragedy. Witness three air disasters caused by human flaws and tension in the cockpit, including the 1972 crash of a British Trident, a Minnesota commuter plane that slammed into a hillside, and a Colorado flight doomed by a hungover captain.

An airliner leaving LaGuardia Airport in New York is crippled after flying through a flock of birds. A Canadian flight crew faces disaster when their Boeing 767 loses power and becomes a very large and heavy glider. A violent thunderstorm wreaks havoc on a Boeing 737 flying over the Gulf of Mexico. These three crises would have led to fatal accidents if it weren't for the heroic efforts of the pilots in the cockpit. Witness some of the most remarkable landings in the history of commercial aviation and meet the pilots who pulled them off.

Some of aviation's worst disasters involved the world's most advanced passenger planes. Often, the calamities are caused by a breakdown in trust between the pilots and their highly automated aircraft, turning the cockpit into a struggle of pilot versus machine. Investigate three crashes where experienced pilots lost control of their high-tech planes, including a commercial jet crash that went down at an air show, an Airbus A320 flight test gone wrong, and a modern airliner that dropped from the sky and slammed into the Atlantic.

A 737 cruising above an Indonesian jungle suddenly plummets from the sky. An Airbus A320 crashes into the French Alps. Malaysia Airlines Flight 370 vanishes over the Gulf of Thailand. At first, these accidents perplex investigators, until surprising findings suggest the pilots could be to blame. See how these acts forced the industry to be more proactive in monitoring the mental health of their pilots.

When a flight ends in disaster, investigators must determine what, and sometimes who, caused the accident. Some cases are easy to solve, but others require unrelenting diligence and Sherlock Holmes-level powers of deduction. See what it took to solve three plane crashes that stumped examiners, one in the Florida Everglades, another in the small Scottish village of Lockerbie, and a miracle emergency landing at London's Heathrow Airport.

When planes crash, the pressure is on investigators to uncover what happened. That pressure increases dramatically when the case involves high-profile victims or when examiners disagree about the cause of the accident. Witness three controversial air disasters: a 1958 failed takeoff that wiped out the Manchester United soccer team; the 1985 tragedy of Arrow Air Flight 1285, which killed 248 U.S. soldiers heading home for the holidays; and the 2010 crash that claimed the life of Lech Kaczynski, the president of Poland.

From takeoff to landing, pilots face countless tasks, each one of vital importance. Any distraction, no matter how minor, can turn a routine flight into a disaster. Revisit three tragedies caused by diversions in the cockpit, including a casual conversation that led to a fiery accident in Dallas-Fort Worth, an attempt to fix a failed indicator light that sent a plane into the Florida Everglades, and a demonstration that led a brand new Russian Sukhoi Superjet into a mountain south of Jakarta.

When a fire breaks out on a plane, an emergency situation can escalate to a deadly disaster in seconds. In Manchester, a holiday flight bursts into flames before leaving the runway. A joyous return home to Nigeria from Saudi Arabia turns tragic when smoke overtakes the aircraft. And small batteries in the cargo hold create a massive blaze aboard a UPS jet. Revisit the final moments of these tragic flights and see how the crashes led to major changes in the aviation industry to make flying safer.