When licensed to fly internationally can you fly an ultralight? I ask because the rules defining an ultralight very from nation to nation. It seems like if you are licensed for a larger plane then anything smaller would be ok also, but not sure. Alternately, could you license an ultralight as a sport plane or regular plane. The idea is ultralights are CHEAP.
you do not need a certificate (license) to operate a ultralight.
I don't believe the US Sport Pilot license is recognized outside the US. Neither is the certification for Light Sport Airplanes. They can't be taken outside the US.
A new LSA goes for about $100K. You can buy lots of certified airplanes for less than that. For another 20 hours of training you can get a private pilot instead of sport pilot license. If you want to fly outside the US, I suggest the private pilot and a fully certified airplane.