That's correct. The 70/76 seat RJ # has reached the cap, & no more are allowed until Mainline grows considerably. We have to return to 770-ish airplanes in the Mainline fleet, & then grow from there before they can add.

With 757/767's sitting in the desert since the economy tanked, and the DC9-30/40's(That's 32 aircraft) being retired this year it's going to be a while before any more RJs come to DCI land.