MTP2AP,
Like I said, hard to believe that ASA will not retire or replace any E120s with RJs. I also inferred (perhaps erroneously) that 1500 pilots meant about 150 aircraft, an average staffing of 10 pilots per AC. But whatever, let's not split hairs.
As for your question about how Eagle's size pertains to the current discussion of ASA growth, I will elaborate for you.
Eagle is (excluding the TWE carriers feeding old TWA routes) the only feeder to AA, with many pilot bases throughout the US. ASA is one of a number of feeders to Delta, with only 2 bases currently. If ASA were to grow as rumored, that would mean that ASA alone (not including the other Delta Connection carriers), would be larger than ALL of the feed to AA in AA's entire system, and doing it out of 2 bases (unless new bases are scheduled to be opened?). This, although possible, doesn't quite make sense. Unless Delta really does want to replace mainline flying permanently with RJs.
I mentioned Eagle as a yardstick, so to speak, to put things in perspective. If ASA really does grow as stated, that would be a real eye-opener and head-scratcher.