If you want to be a dispatcher, I would think twice about applying and taking this job. If you want to work for American and dont care in what capacity then apply and take this job.
There are many internals at AA with a license and some of them have dispatch experience. Some of the recent crew scheduling internals were in scheduling for over a decade. It is similar at Southwest, Delta and United. If you take a position in a company outside of dispatch without having dispatch experience, you are in a pool with a lot of others in the company who want to get into to dispatch. You need to be able to differentiate yourself from the other internals who have a leg up on you in terms of reputation, connections and time in the company. This can take a significant amount of time. Dont expect to be hired into crew scheduling and then be in dispatch 6 months to a year later without experience in dispatching.
If you go the regional/supplemental route, you make yourself much more portable and given yourself more options. Airlines frequently change their preferences in hiring. There are always going to be at least one or two majors at any given time with a preference for hiring externals than internals. You really dont want to be an internal at a major airline that prefers hiring externally with experience if you want to dispatch for that airline.
Big questions still to be answered at AA. US and AA had two completely different ways of hiring. Not sure yet which way will prevail going forward or if it will be a hydrid of some sort. Something to consider when taking a job in crew scheduling if you have an eye for dispatching.
