I believe that in Norway (where I'm from), you need a special license to do aerobatics (JAA stuff).
How does this work in the US, do you need any special training to legally go do loops etc? Or do you just need to follow the FARs regarding parachutes when pitching more than 30 degrees up and down, and other aerobatic FARs?
Only thing I could think of would be a tailwheel endorsement to fly most of the airplanes that are rated for those things