around 2 years ago Clt-Mia's one 738 flight was replaced by a erj. So it wouldn't be a new route just a resumed one. It was discontinued due to lack of gate space i believe. The flight arrived at like 8pm and left at 7am. However with only 2 AA gates and 1 common use gate AA didn't have much space with a Dfw S80 at one gate, a mia 738 at one gate and 2 or 3 rjs at the other Jetway. Clt just seems like the odd one out of the mainline system at Mia.