Larry, If you where tasked to fly an unmanned aircraft around the world, can you do it? Sure you can, easily. Connect an Iridium data link to a three axes autopilot. Data link the engine parameters to Rotax engineering and contract a meteorologist firm. Several cameras. Now, start calling the airports that you are scheduled to land at and set up arraignments. Fuel, Maintenance, contacts and hotel if there’s a human passenger in your aircraft. The biggest challenge is going to be customs and permissions.
The military has been operating drones from thousands of miles away for over a decade. We have certified autopilots that land complex aircraft at a push of a button. We have access to Data and communication over the entire planet earth, the ISS and soon the moon. So I read on AvWeb.