Hi there, I just spent quite a long time reading up on the new Q400 from Bombardier, you should go to their website and read up on the new Quiet Series Q200/Q300/Q400. The Q400 is a stretch of the Q300 and has room for up to 78 pax and is also a lot faster, 350 knots compared to the Q200/Q300 295/287 knots respectively. If I had a regional airline I would not bother with the 19 seat market it is closing so fast but larger turboprops are here to stay for a really long time.
As RJ traffic grows so does the turboprop market unlike what everyone thinks. For my fleet I would have the...
328 w/ 32 seats
Q200 w/ 37 seats
Q300 w/ 50 seats
Q400 w/ 70 seats
I would fly out of Boston, NY, Washington, Philadelphia to everywhere east of the Mississippi River. I would stick the Q400 on all routes that might have competition from the RJ since the Q400 has regional jet speeds but the economics of a prop and also has full galleys for hot food and is also as quiet as a jet.