Originally Posted by
drvannostren
Strange, I thought once you passed security you could get to whichever at MIA. Guess I shouldn't have bought this thing before getting responses. I'll just have to find a different airport to use it at in the next year I suppose.
No. The H and J concourses are entirely separated from the rest of the airport (although there is a long hallway that connects H and J) so you won't be able to access the AA concourses unless your ticket says you are departing from those.
Your only choice really is to pay for a one-day pass at the Delta Sky Club.