I think its the combination of multiple experiences thats important. You can be at an MV show, or a castle, or service, and that's what you concentrate on. The minute you get the extra sounds and sights of an aircraft overhead it transports your imagination and you really start to think about it. The same goes for the sound of the bugler or the sight and sound of a tank rolling past.
I remember my first day at the museum. I'd been upside down in an OT-64C pulling out engine parts to restore our OT810. It was great fun and I loved the engineering, but at the end of the day I was knackered, aching, and wondering if I had the endurance to do all of this heavy work. Then out of the blue three spitfires took off in quick succession and flew straight over the workshops. That moment sealed it for me. It was so far removed from everyday life that it seemed almost magical, yet it also made me think of the people who did the same thing for real, and appreciate how different and outside of my comprehension that life must have been.
Even doing the tank rides around the arena, it's surprising how everyone stops and watches as an aircraft takes off. The squealing stops and the eyes go big just for a second.
Aircraft can fly just about anywhere, so they are a good way of adding that second experience. Any show is just a show, until you blend in some other elements. That's what makes it an experience. Thats why its so important we all keep our vehicles going, whether it fly's, drives, or swims.