We did the Mountain Voyager tour last week, and I am not sure we will ever be able to top this flight.
First off, the weather was absolutely perfect. Not a cloud in the sky all the way to Denali. Our pilot, Mike, told us that we were probably at the top 1% of the bell curve for weather this summer.
The flight was so smooth, and Mike pointed out all the sights along the way. Landing on the glacier was definitely the highlight of the trip for my kids. We were the only plan in the area that we landed at, and it was awesome being out there with just 10 other people.
For possibly a once in a lifetime experience, definitely consider taking one of these flightseeing tours.