And I was always told, that if I do not show at plane after getting boarding pass, my luggage will be thrown off.
When this rule was cancelled?
@Lowca
Can't speak for all the countries in the world, but here in France, this rule doesn't exist.
I was recently unable to board a plane in a big Parisian airport as a pax. The plane did leave with my luggage. I complained about the safety issue it could cause to the DGAC (Direction Générale de l'Aviation Civile, a French authority who deals with everything regarding safety at air), and I have been told that there is [in France] no rule that forces airline to remove lugage when a passenger doesn't board the plane. It is even the opposite.
I have been astonished by that information, and of course my first thought was "Wow, you can put a bomb in your luggage, purposely miss the plane and boum..."