Originally Posted by lolwut

CVG-DTW. Delta. 6 RJs a day. No mainline.
CLT-GSO. US Airways. 8 RJs a day. No mainline.
DEN-COS. United. 11 RJs/Props a day. No mainline.
PHL-LGA. US Airways. 11 RJs/Props a day. 3 mainline.
PHX-TUS. US Airways. 11 RJs a day. No mainline.
DFW-IAH. United. 12 RJs a day. 2 mainline.
SEA-PDX. Alaska. 24 Props a day. No mainline.

I'm sure there are many others. There is plenty of room in airline schedules to replace RJs. What city pair, aside from the biggest business market, really needs more than 4-5 flights a day? If the city is served by two hubs, even 3 flights a day to each, alternating to the hubs, is probably plenty.