Dog aggression cannot be corrected, it can be worked on, and the trainer can learn how to redirect that aggression. Fact is, DA is a typical trait in the APBT, you just have to learn to control it, you cannot eliminate it.
I know, some of you are going to say "But my pitbull does great around other animals" and yes, mine to as well-after a bit of one on one introduction and such, they are fine. But I know the breed, and I know that DA is always there. But you can work with this and CONTROL it.