Originally Posted by
edsh
Between walking and taking the bus, I'd walk. The bus will make a second stop at terminal B, then C, and E before it gets back to terminal A, and it only passes about every 5 - 10 minutes. Your timing would have to be perfect. If you walk, exit terminal B on the upper level, turn left and follow the sidewalk to A. A fast walk to take 5 minutes.
I'm not sure if it's possible to walk on the outside sidewalk to Term A like it used to be in the old days. Now, you exit Term B, go left, and almost immediately enter a structure on your left in which you'll find an escalator and signs directing you to Central Parking. Go up the escalator, across the skywalk at the top, but when the skywalk turns to the right towards Central Parking, turn left, where you will find the escalator to take you back down to Term A. (It's much easier than it sounds. You won't get lost.)