ValuJet Flight 592
ValuJet Flight 592, a McDonnell Douglas DC-9 airplane, crashed in the Florida Everglades in 1996, killing all 110 on board. The cause was the mistake of loading oxygen canisters as cargo. The investigation revealed that the canisters labeled as "repairable" had been misunderstood as "empty", and at one point the National Transportation Safety Board suggested that the use of non-English speaking mechanics may have been a problem.
Because of this incident ValuJet bought a tiny airline called AirTran and assumed its name. This allowed ValuJet to recover and even increase operations. 
- William Langewiesche, "The Lessons of ValuJet 592," 281 Atlantic Monthly No. 3, 81 (Mar. 1998).