What do you do with partially used fuel canister you can't bring back?

I'm into visiting the national parks so I often fly out to different parks to visit. I recently decided I was interested in a jetboil over a hobo stove so I can make my dehydrated meals a lot faster. It's great for camping in areas around where I live and when I'm solo I can often even use a single canister for multiple trips (though I always have a backup).

This presents a problem for when I travel to national parks or other rather remote areas and have to fly in rather than drive in. You can't take fuel canisters on a plane, so what should I do if there's still quite a bit of perfectly usable fuel left? It feels wasteful to just let the rest burn up.