There was no distress signal, no explosion, no obvious signs of malfunction. So why did Egypt Air 990 suddenly crash into the Atlantic during what was supposed to be the calmest part of the flight? The investigation into this 1999 catastrophe would develop in two directions, mechanical failure and pilot error, and the results would fuel an international controversy that continues to this day. Reexamine this shocking and baffling air disaster as we relive the aircraft's final moments and revisit the disputed investigation.