There is definitely a place for the EAS service provided by B1900s, and this is the type of stuff that should be flown by commuter affiliates. There are also important markets that require a prop (HHH as pointed out), and some that for common sense reasons would be more cost effective with a 30 seat prop- Hagerstown for one, and some of the New England communites served by Colgan Air. If Airways is the only game in town, there is no reason to send a regional jet into that city.
Theres also the issue of capacity with the choice of the Bombardier CRJ. The CRJ family has flexibility upwards with 50-80 or so seats (including the notorious 705 or whatever
🙄 ). The lowest capacity CRJ has 44 seats. The Embrear 145 family on the other hand has flexibility downwards, with 37-50 seats- the 170 and 190 are a totally new airframe. So with US getting the CRJ, this leaves a problem for some of the Dornier and Dash 8 markets- 50 seats could be too much capacity. I dont believe US has really addressed that issue as it probably just depends on what ever is cheapest, and they like to keep everyone in suspense.
Continental has the right idea- a single RJ carrier, and then Continental Connection affiliates operating B1900s and EMB120s. How our smorgasboard of regional carriers and blurry product definition (B1900 and E170 are both Express?) is cost effective or efficient is beyond me.
As for Shuttle America, who knows. If they have any sort of future I dont believe its with US Airways. I did see that thier pilots just signed a contract that pays them half a peanut a month, sadly thats probably good for them in today's environment. However, I cant think of any airline thats looking for a handful of ancient Saab 340s. The markets they serve for US are mostly routes that will eventually be RJ, but arent too high on the priority list (and thats if the Pittsburgh hub remains longer than a year). US will probably keep them around for a few months to fill in gaps in the PIT Express network as PSA parks the props and transitions to jets. I wonder if anyone in CCY has ever gotten an eyeful of thier delapitated cabins and some of thier um... flight attendants
