Because they are still left with what I have just pointed out, while men have their cake and eat it! It isn't difficult to see, if you just open your eyes.
Take part time then, if that is an issue for you. I don't have any problem even if this was positively discriminated against. However if you want to work full time in airlines ( and collect full time money) you have to work full time which means 24/7 rosters and taking the good with the bad.
It is hypocritical to want equality in hiring then to discriminate in rostering once you get in.