My mistake then, though if you google Busch gardens/Kings dominion combo tickets there are multiple news stories from 2015 saying that they were going to start offering them. So at least at one time they did offer them. Besides I remember back in the day there was a Seaworld/Busch gardens/ Universal combo ticket down in Florida, so it isn't unheard of that parks under different companies offer combo tickets. I do appreciate the advice though. I'm in Pittsburgh, so if I can make it to Cedar Point/Kings Island this summer I'll probably end up getting the pass.