if you want to see actors fly, go work on a real production of "Peter Pan" and see how Foy does it.
I got to work with those guys once. They are tight lipped, they brought the rig out we helped them mount it to the correct battens and they showed us how to operate it. That was it. We could not open it and see the internals. But it ran smooth as silk.
I'm also willing to guess that the park has spared no expense to make the flying look realistic. Now whether or not this was a good business decision or even vital to the show production is an entirely different story.
Not that it matters now, but it turns out a theme park telling of the classic A Christmas Carol story is possible. Here's a video of the show that Knott's plays for their winter event, Knott's Merry Farm.