Hi Jamie,
Welcome to 5 Star. Grays Anatomy is almost on

so I'll try to give you a couple quick tips.
I'm at a huge disadvantage because I know nothing about the sport but YOU DO! What other things do hang gliders need? Do they often travel to the places they hang glide? Are there certain travel hots spots? There are tons of travel affiliate programs. Do many of them also like to hike or do they need to haul gear? How about packbags Irvs Luggage is a good one. Do they need hydration packs? I had a company call recently that has one for that. How about other sporting equiment? BentGear on Sharesale is a good one.
Do a search on Google for "hang gliding affiliate program". Quite a few things come up but I don't know which ones are a good fit. Get into your readers minds and figure out what types of things they are intereted in and then find a program that fits.
Lots of good threads here about how to find and research niches. I'm sure theres one out there that fits your needs.