PSU University Park has GPA minimums to enter the major. Aerospace engineering was 3.0. You may want to see if you really are guaranteed the major or if you will have to meet that GPA minimum to transfer from Erie to University Park.
However, it seems odd that you would want to choose the Pennsylvania equivalent of starting at a community college and transferring to a university when you could do the same thing at much lower cost by staying in California. 4 UCs and 5 CSUs have aerospace engineering, and many more have mechanical engineering (check for aerospace electives within the departments).