On the U.S. side, there's not a lot a "regular" civilian pilot can do down there. The New York Air National Guard provides C-130 support (as do NZ, Australia, Italy, and maybe some other countries), USAF flies some C-17 missions back and forth, helicopter operations are usually done by a big civilian contractor (PHI for many years), and the Twin Otters are under contract from Kenn Borek Air from Canada. Once in awhile, there's the odd Basler-DC-3, or a P-3 deployed there.