It is my understanding that AA likes the RJ;s for their flying. AA appears to like taking flying away from ML and shifting it down to the WO for lower costs, as I was advised.
Besides it doesn't make a lot of since to cut out the AA E-175EW from a company (RAH) where AA owns about 1/3 of the company to shift it to the WO.
This stranger things have happened - Like closing the ORD & MIA bases.
IMMHO.