I have been on MD80(81/82/83) aircraft 11 times in the last two months and have found the following method to be reliable 10 out of 11 times:
1. Flight number 2800-2999 are TWA planes and DO NOT have power ports. Some of the first class seats look like they have power ports but that's because all of the newer F seats are designed alike. So if a new F seat is in a TWA plane, the power port will be there but will not work.
2. If you look at the seat map and see the coat closet at the back of 1st class, three rows of seats on the left side of 1st class and no 30AB seats, you WILL HAVE power ports.
3. If any of the qualifications is not true in step 2, you WILL NOT have power ports.
4. Steps 1-3 are subject to last minute aircraft changes.
Mike