chadandtoni - I fly through Charlotte and Philadelphia all the time (at least three times a month). Going from the A to the F terminal in Philly you will need to board a shuttle. The shuttle runs regularly, but sometimes you have to wait a few minutes, and then it takes 10 minutes to board everyone and make the drive from A to F. It will be close with only a little over an hour layover, but it is doable. If you can, try to get a seat towards the front of the plane. The further back you are in the plane, the longer you wait.