Four years ago I would have said, most likely. Anymore, .....................with the oversupply of pilots.............., having MD80 time is definitely a plus, but they obviously will take who they deem to be the best qualified. I'm not an interviewer, but I'll guess that Spirits idea of best qualified mirrors that of SWA, JB, etc. The MD80 time would only be a tie breaker, and it would probably lose out if the other guy had Airbus time.
Good Luck,
enigma