Dani,
I don't know anything about your swiss household, but all you are saying about SN is wrong.
What you call a fleet of 320-330 is three 319 and three 330.
They are mainly flown by ex-sabena guys at a higher salary.
I was a contractor there because a lot of the regionals failed their conversion to the bus.
The regionals and the ex sabena guys can drink each others blood, despite the fact that years ago the Sabena guys dropped part of their salary to raise the regional salary...
Loads are bad, CEO ran away, a new one put in place for 12 months only, so probably to do some dirty work.
The airport and the state are protecting the airline and probably keeping it artificially alive.
The numerous ex Sabena managers are still driving big company cars though!