A lot of guys speculate about whether AA is more or less interested in people who work for the wholly-owneds in terms like "AA won't hire Envoy captains because they want to squeeze as many years of (practically) free flying out of them as possible!" That's probably what this is.
Historically, WO pilots selected outside of the flow at AA have gotten way more slots than the portion of the regional workforce we represent (54 pilots last year out of 397 street hires, 216 of which were .mil).