Date: October 31, 1999
Location: Off Nantucket Island, Massachusetts
Aircraft: Boeing B-767-366ER
Airline: EgyptAir
Flight No: 990
Fatalities: 217 : 217

Soon after reaching cruising altitude the B767 entered several dives and recoveries before plunging into the Atlantic Ocean. The accident was caused by the relief first officer's flight control inputs which caused the airplane's departure from normal cruise flight and subsequent impact with the Atlantic Ocean. The reason for the first officer's actions were not determined by the NTSB. One could conclude the actions were deliberate in an attempt to commit suicide.