Thanks for enlighting me that the Q400 is a bigger version of the Q300 and the Q200....
The point I was making is that while it always nice to have a standardized fleet, a new Q400 is, if I remember correctly, more than 30% more expensive than an ATR72-500 if you look at the acquisition cost. Euromanx's route structure certainly does not call for the performance of the Q400 (where it has a clear advantage over the ATR), so it all comes down to fleet commonality (unless they are looking at a larger capacity aircraft also for the LCY route for which the ATR72 is not certified). Question therefore is how big is the gain you get from having 3 Dash 8 instead of 2 + 1 ATR - so that the hefty additional investment when acquiring a Q400 is justified ?