Trips are pretty similar no matter where you are based. Sure, some bases may get more over nights some places then others, but you are basically flying over the whole network on a trip. i.e., just because you are based in ORD you are not just doing Grand Rapids turns all day. You will go to LGA, IAH, DEN, ELP, etc. The E-170 has a nice long range for a Regional jet and the big three use that to its full advantage. They save most of the smaller hops for the 200s and 145s.