I'm not sure if they are adding new routes with the ATRs, or phasing out the Saabs, but if they are adding routes, then it's no big deal.... the new routes will be ATR and the existing will be Saab. If they are replacing the equipment, then our schedule will reflect (as time allows) the aircraft actually flown. So if a Saab gets replaced by ATRs, then the route would be ATR. If there is a Saab/ATR mix, then that is what we would have in the schedules.
All that said, in case you haven't seen it in the manuals yet, we do allow reasonable substitutions. So if we have a route listed as a Saab route and you want to sub in an ATR (or vice versa), feel free to do that. We know that airlines sub out aircraft all the time, so it is part of our lives here as well. The key is reasonable. If you try to fly a Silver route in to EYW in an A380, something might be said about it
but switching between two props they have in their fleet is not a problem.
Hope this helps.
Alan