You need to be way more specific, there are probably over 50 flights out of Fairbanks that cross the circle. Take a look at a map. Superior would be to do some research and determine what location would be the most interest. I have flown over the circle several times, many different routes and stops. I especially like the cargo runs that can take you to very remote areas. As for a "tour" my opinion only, the fly/shuttle options in/out of Coldfoot are very well run and give you a varied interesting full day tour.