Garuda Flight 421, a Boeing 737, faces simultaneous engine failures due to extreme weather, leading to a daring river landing in Indonesia, while Cougar Flight 91, a Sikorsky S92 helicopter en route to offshore platforms, suffers a main gearbox failure, ultimately ditching in the sea.

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In this spinoff of Mayday/Air Crash Investigation, every episode examines multiple aviation disasters that prove to have similarities including; engines that separated from their aircrafts midflight, mismatched pilot pairings that led to deadly crashes, and improvised landings with tragic consequences.

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