I had very high hopes for the Museum of Flight and was quite disappointed. There were few exhibits, and most of the exhibits were planes strung from the ceiling, giving you just a view of the underbelly.
There are a few plane exhibits where you can sit in the pilots seat, but I was discouraged from partaking in it by the staff and they seemed to hint that such things were only for children, even though there were no signs indicating this.
There is an old Air Force One (from the Ford Administration, I believe) that one can walk through, even though 99% of the plane is cordoned off by plexiglass.
All in all, I found this museum to be very much lacking in aviation history and exhibits, and would not reccomend that anyone go here.