Delta scope:
125 50 seat aircraft
325 51-76 aircraft of which up to 223 can be 71-76 seats.
450 total regional aircraft

Once the Expressjet/ASA Delta flying winds down, Endeavor parks 16 CRJ200s and takes on the 31 Expressjet aircraft, and SkyWest takes on the E175SCs, scope for Delta will be maxed out.