When I travel for work, I use a booking system that enforces the "lowest logical fare" rule. Basically, I have to choose the cheapest flight that "makes sense." For instance, I don't have to chose a flight that connects in Las Vegas if I'm flying DC to Miami. But I would have to take a connection in ATL vs a nonstop if the connection is cheaper. One of the options I can check is "Hide All Prop Planes." I.e., the system will never make you get on a prop plane