727 photo
I dont think is N844AA. If she wore the IRS colors, she got them after she was stolen. It's doubtful that IRS would have taken 44AA and put it into passenger service because the interior was totally gutted of insulation and covering panels. To get her back into passenger flying condition would have been a lot of work.
That said, I can contact someone who is very familiar with IRS airlines and ask about this aircraft.
Can you say where it is and when the photo was taken?