Overview: A trio of crashes reveal that when the nuts and bolts of maintenance go unchecked, it can spell catastrophe. A mechanic's error in judgement leads to a terrifying mid-flight disaster in Texas. Botched maintenance and a missing cotter pin leads to a life-and-death struggle for three cargo pilots. And, after a twin turboprop goes missing in the North Sea, investigators uncover a criminal empire half a world away. Take Off Tragedies