Sister Park Passes

I was pleasantly surprised this year when we went to check in with our passes from Dorney Park. First the worker just looks at the passes and then you just sign in, it speeds it up a bit. BUT the BIG SURPRISE was that sister park passes get in at 9 o'clock, I couldn't believe my luck. Is this common knowledge? I couldn't find it in writing in any of the brochures? or is it just a courtesy? And will this policy be in effective at Halloweekends?

We found this out last year with MiAdv passes. Its not documented anywhere that I know of.

Yeah, it's a courtesy that's not advertised.

It was my understanding that ONLY people with joe cool club on the passes or those with resort entry tickets were able to get in at 9...shouldn't sister parks and other passholders without JC and the GP have to wait until 10? t?

That's not the case. Sister park passes are allowed in with JC.