The phrase is really shorthand for a deeper question, namely, what happened to the optimistic predictions for air and space travel after the historic Apollo landings on the Moon, between 1969 and 1972? Why, after 45 years, are there no permanent colonies on the Moon?

Many visitors express the wish to see the interiors of aircraft and spacecraft on display in the Museum. But to protect these historic treasures, they must be displayed behind barriers, which makes it impossible to see inside. But there are several cockpits you can see in the Museum, a day devoted to getting up close with aircraft, some cool electronic views, and a couple of great books that give those who are curious some excellent interior views.