Can we in depth highlight and discuss all the reasons behind air crashes ?.
1. Bad Weather viz Thunderstorm,fog conditions leading to unable controlling the aircraft.
http://en.wikipedia.org/wiki/Storm
Thunderstorm - Wikipedia, the free encyclopedia
2. Hit by a Object (Bird etc) leading to wing/s broken.
3. Technical failures in the aircraft - Jet Fuels shortage, Jet Engine
Malfunctions, Specific Instruments/Controls Malfunctions in the cockpit etc
4. Rare case - Both Pilot and Co Pilot Cardiac or any other major organ failures.
Any more reasons ?.