…has a more significant endurance :
(from wikipedia) (what should we do without it ? 🙂 ;

The AeroVironment Global Observer is a concept for a high-altitude, long endurance unmanned aerial vehicle, designed by AeroVironment (AV) to operate as a stratospheric geosynchronous satellite system with regional coverage.

Two Global Observer aircraft, each flying for up to a week at an altitude of 55,000 to 65,000 feet (17,000 to 20,000 m), could alternate coverage over any area on the earth, providing a platform for communications relays, remote sensing, or long-term surveillance.

In addition to flying above weather and above other conventional aircraft, operation at this altitude permits communications and sensor payloads on the aircraft to service an area on the surface of the earth up to 600 miles (970 km) in diameter, equivalent to more than 280,000 square miles (730,000 km2) of coverage. Global Observer may offer greater flexibility than a satellite and longer duration than conventional manned and unmanned aircraft.
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friendly yours, Etienne

But considering the size, it is somehow logical. It is almost medium aircraft (Wing Span: 175 feet, Length: 70 feet). In addition it’s load is only 180 Kg and do not forget it is a US technology. We are talking about a new county in the field with a reasonable sized UAV and 1000 Kg of load.