High Quality Content by WIKIPEDIA articles! NLM CityHopper Flight 431 refers to a Fokker F-28-4000, registration PH-CHI, that was due to operate an international scheduled Rotterdam–Eindhoven–Hamburg passenger service. On 6 October 1981, the aircraft encountered severe weather on its flightpath while en route its first leg, minutes after taking off from Rotterdam Airport, and crashed. All 17 occupants of the aircraft —13 passengers and a crew of 4— perished in the accident.