Some military drones are large enough to carry a lot of fuel and are designed in a way to be very efficient (engines for endurance, typically are light, loiter at high altitudes which give less stress on the airframe). The RQ-4 Globalhawk for example can loiter for more than a day and is about as long as an F-16 but around 4,000 pounds lighter (compared to an F-16’s empty weight).
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