Add SFO to my list of "why seasonal?". The daily flight always seems to be doing quite well & I know a lot of business travelers who prefer going in the night before rather than straight from the airport to afternoon meetings. Plus, this also allows for breakfast meetings and noon departures home via IAH.

The DEN mainline increase is most likely due to Frontier starting twice daily service with the Baby Buses.

I really doubt that ATL will change from the ERJs considering the volume of mainline service provided by Airtran and Delta.

MSY is an odd one. The flights always seem to be full on the ERJ but I would guess that the yields are low due to the competition of LCCs. Then again, considering the frequencies and equipment from IAH is it worth it to bump from CLE?