I know for a fact that you can use your season parking at any six flags and not have to pay for parking again. We live in NJ but purchased our season pass in MD because it was only $49 instead of $99. We took a road trip to D.C. and validated our passes. This year, we were able to renew online and the passes came to us validated with the same pictures on them from last year. I got the season parking on my pass and we never pay to park in the NJ park. It says it right on the website that season pass parking is transferable to all the other parks.