directbears is partially correct. Progression at Eagle is practically non-existant and will be that way for a couple of years. Current captain is 7 years (just awarded today, LAX Saab 7/99 hire). Unfortunately there is zero growth, zero AA recalls for the next 18 mos (my opinion/guess only) that would create movement, and a very real possibility of losing airframes from the current fleet.
That said, you should interview if only for the experience. If you have no other offers, take the job and get the 121 time.
directbears, where are you now? Was it really a good move for you now that you'd be on deck for the Captain seat?