F-16 fighter planes scramble to intercept a rogue Learjet over the Midwest. A tiny airport in the Canary Islands plays host to the worst aviation accident of all time. And the colossal investigation into the 9/11 attack on the Pentagon. Every time a plane crashes, the world takes notice. And so do the experts whose job it is to figure out what happened. This season, we revisit some of history’s most catastrophic plane crashes, brought to life through eyewitness accounts, harrowing reenactments, and interviews with the investigators who ultimately determined what went wrong.