@soullimbo
As far as I know, communism was abolished even in Russia a couple of years ago.
I am sure other parts of the company work just as hard as the pilots and probably even harder, but that should not limit any payrise for another party. Since the non pilot groups have different representation, it is up to them to get the payrise they want. If another union is able to get more, the other unions should have tried harder.
Since I do not know what the paylevels are for the transavia pilots, I obviously cannot say if their demands are justified, but as far as I am concerned, other employees' payrises do not matter in determining what you want. (assuming the pilots and the union can indeed justify their demands and they do not demand ridicioulus amounts of money)