No, they'll be some replacements, but more replacing the 717 on the west coast, to allow the 717 to come back to DTW/MSP/ATL to take the low end 88 flying. Delta has a ton of 88s to retire, not to mention it sounds like the 90 retirement is being accelerated due to engine costs. Additionally they are retiring a number of 757 and some of the older 320s at this point.

Quite simply, Delta can have 325 large RJs (of which 102 are 70 seat or less) and 125 50 seaters. The only reason they'll back away from that number, is running out of 50 seat airplanes that are able to be maintained at a reasonable cost or lack of pilots.

As for the CS100 in ASE. It's too heavy and the wingspan is too wide.