Overview: Denver, CO, 1955. When United Airlines Flight 629 bound for Seattle explodes in mid-air, killing everyone aboard, the new-to-air travel nation grieves over the terrible tragedy. But when crash investigators find a few strange inconsistencies in the wreckage they start to wonder if it was an accident at all. What follows is the discovery of the first-ever act of commercial airline sabotage in the United States...the motive? Money.