Greg, I'm sure you're correct, but from my experiences, the timetable does not discern between MD80, -81, -82 and -83 aircraft. It simply lists them as being either M80 or M83. The M83 listed are ex-TWA, the M80 are AA metal (wouldn't it be nice if we still had the 2800-3199 flight codes to use as determining factors...).
I have yet to board a DC-9-80 series AA plane and not have power ports installed (in the last 2 years, anyhow); whether they're working or not is another story. I wish the seat maps were a great prediction device for determining whether or not you'll be "power port positive", but I find them as reliable as the PC timetable; that is, the equipment changes (especially through DFW or ORD) often enough at the last minute to throw a monkey wrench into the best of plans. YMMV.