I have a number of SAAB 2000s flying many routes for my African airline, they are all about 26 years old.
As the airline has been going for some time, I thought it about time to upgrade my fleet and introduce some brand new ATR72s.
Well that was a mistake apparently. The new ATRs on the same routes as full SAABs are getting very low passenger numbers? On some busier routes I still have both types flying and the SAABs are full and the ATRs nearly empty.
I might be wrong (most likely), but the Saab is a fast aircraft, compared to the ATR, and subject to gameworld, speed seems to be king with the ORS. Have you compared your ORS ratings between Saab and ATR (on the booking system)