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Completely stumped? Maybe this list can help you.
As a start:
Building and designing stuff that stays up in the air, mostly
Model RC airplanes
Cableway architecture or tensile membrane architecture
Tethering systems like lazy jacks, and whipple trees too
Climbing systems and rope access
Tent and fabric building design and use
Air traffic control
CAD & Simulation
Computational Fluid Dynamics (CFD)
Making and selling a product
Please add, rename, and rearrange categories. And add content.