6 foot

Been multiple times a week. And had no issues. Saturday's can get a little busy but if you go to the wind tunnel desk and let them know ur going to fly they give you a pager if they are busy so you can start doing all the other attractions till ur called. That's rare. One of those busy days I witnessed people going up to the counter after being at park for hours and saying I want to fly. You don't go to six flags and get to rush or cut online on the superman rollercoaster just because you're ready to go home after walking the park all day. My kids had no problems. By the way those instructors did not stop flying people. When other people flew in the tunnel they were showing our kids what they can do because we asked. It gave them a goal because they were getting better and better as we keep going back. Love that.