From what I understand, of course I'm not a Harvard MBA, the RVSM on the planes are all lower than the 73 or Bus. If mngmt is smart (I know, I know) they'll let this happen and continue to shift flying back into mainline. The smaller airplanes are just not getting it done at a competitive price with fuel at 100/bbl. If I were king of the world, there wouldn't be a regional flying at my airline unless it had about 25 seats and served places where people are willing to pay a premium to fly out of for convenience.