Yes, that is one place you see them. Inflatable golf domes, football fields, etc. Concordia university, Loyola campus, in Montreal set up one every winter and take it down for the summer. I have gone past many times on the commuter train, but never stopped to visit. I also pass it on bike sometimes in the summer months but the dome is gone then. I will have to see if they have any open activities this winter as an opportunity to visit.
OK to start, I will admit it's a day off and so I had a sip of single malt with lunch.
Now then, I'm thinking about installing a revolving door on the main entrance door of, oh let's say, a 747. It would have baffles such that would cause the speed of rotation to be affected by the airspeed of the aircraft. But also it would have a centrifugal type of braking mechanism to keep it from spinning out of control. Also, winding's would be attached to generate both AC/DC power which would relieve a portion of the load from the engine driven generators, thereby reducing fuel consumption. This could save the airline money, which could lead to lower ticket prices, and keep Greenpeace happy.
We would enjoy completely fresh air throughout the flight, and also provide a method of dealing with, heaven forbid, a hijacker.
I'm calling Boeing right now.