I meant that the combination of the 2 would yield a few more gates to what already exists. I think that just about all on here are aware that PHL is a US hub, and that AA has minimal existence there. I guess that you can twist my comment anyway that you wish, but US will be taking over AA in a station such as PHL. Expect everything to be the same except the name of the company.
Also, the combined airlines won't have 75 gates at all. Taking a quick look, its more like 50 mainline, and 39 express. From what I recall there are about 8 express gates that are unusable due to construction.
So if you want to get technical about everything, your numbers are off by 25 gates.....that's a lot.