This is what I came up with. I also think one day that PSA will take over Skywest and Mesa operations, but that will take a while to happen. Finally, I think that Envoy and Piedmont will merge. Anyone agree?

Envoy Air
140/145 15 (Trans State to Envoy)
140/145 75 ??? Maybe
175 20 (Compass to Envoy)
175 44 + 10 + 15 + (61) = 130
240
PSA Airlines
200 35
700 22 (Envoy to PSA)
700 39
900 54 + 15 + (15) = 84
200 -35 (Retirement)
145
Piedmont Airlines
145 13 (Envoy to Piedmont)
145 4 (Envoy to Piedmont)
Assuming they can staff 4 more
145 43
60

Total WO Aircraft 445

SkyWest
700 39
700 12 (ExpressJet to SkyWest)
Mesa
900 64
Republic
175 85

Total Regional Aircraft 645

Contract Expires
Compass (End of 2019)
SkyWest
Mesa
Republic

CRJ 700 112
CRJ 900 148
ERJ 140/145 150
ERJ 175 235

112 + 148 = 260 CRJs
150 (-55) + 235 = 330 ERJs

55 ERJ145s Retire
American only wants 590 regional aircraft