It goes without saying some will be, but if so, which categories?:
When I say involved it means spending at least 1 day every 60 days at an airport or air museum.
1. Light aircraft? (ie: Cessna 172, Bonanzas, Pipers, Van's, LSA, etc, as pilot and/or mechanic)
2. Commercial airlines? (either crew, support, mechanic, airports, etc)
3. Military air (all branches)
4. Museums (small or large, flying or static) **If you participated in the organization/s, even sweep the floor**
You can chose more then 1, and it is loose
I myself am 1 and 4.
I am the nerd on right, and that is the 172 I fly.