Originally Posted by Lighteningspeed

Another reason is the CRJ900 is about 15% more fuel efficient than E175. Do not expect to see anymore E175s going to regionals like Skywest, Compass or Mesaba for DAL. This is because NWA and DAL is looking for a true 100 to 120 seat fuel efficient replacement for DC9s, MD80s and A320s. People have talked about Bombardier C-series but they are not available yet and if they are ordered, it looks like they will be mainline jets to be flown by mainline pilots which is a good thing in the long run.