Not around here. The grades are weighted for AP, regular, and Special Ed classes. (Actually 5 categories). So a 4.0 in a regular class (97 or higher) would be a 5.0 in AP or IB, a 4.5 in Honors, 3.5 in modified, and a 2.5 in applied. So a B in AP equals an A in the regular classes.
I have seen that system before and it has a hidden problem. While it works well for those that are taking a single class, when students take multiple AP classes, the workload becomes significantly harder. As such, what often happens is that the student ends up not being able to keep up with the homework across the board and the overall grade slips by more than one point across multiple classes.