Take in mind these are United owned, only 30 that they can allocate to cheap regional that flies a/c as second party lessor, ie compass /xjet or skywest etc
rah on the other hand operate as first party lessor to which they sell their aircraft for hire to a major. All mainline mix both type of business amongst all the regional feed. Rah did order 94 E175's. 47 as AE. I garuntee they will ink a deal with ual to expand their current Ejet flying with them to give those additional ejets they ordered a home. And now you have full on regional whipsaw ala delta connex. What one airline operates successfully, the rest do to stay in line with competitive costs. Thus the way of the airlines.