The real scare accident for me is the Helios flight 552: https://en.wikipedia.org/wiki/Helios_Airways_Flight_522
Due to maintenance error, everyone in the plane including the crew black out of hypoxia and crash on the land. There are horrific pictures from the site.
What made me not being afraid of flying was to get familiar with the technicalities of the flights, it's less scary the more you understand it.