Add to that list: - A depressurization event, either as a result of an accident or a botched hijacking (see https://en.wikipedia.org/wiki/Helios_Airways_Flight

Add to that list: - A depressurization event, either as a result of an accident or a botched hijacking (see https://en.wikipedia.org/wiki/Helios_Airways_Flight_522 https://en.wikipedia.org/wiki/Helios_Airways_Flight_522) - Pilot suicide, with a somewhat unexpected signature (see https://en.wikipedia.org/wiki/EgyptAir_Flight_990 https://en.wikipedia.org/wiki/EgyptAir_Flight_990) Pretty much anything is possible, indeed. However, I'd recommend this post on airliners.net for a comprehensive sanity check: http://www.airliners.net/aviation-forums/general_aviation/read.main/6027829/1/#13 http://www.airliners.net/aviation-forums/general_aviation/re...