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In page Northrop Grumman RQ-4 Global Hawk:

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The RQ-4 is capable of conducting sorties lasting up to 30 hours long and scheduled maintenance must be performed sooner than on other aircraft with less endurance. However, since it flies at higher altitudes than normal aircraft, it experiences less wear during flight.[5] It can survey as much as 40,000 square miles (100,000 km2) of terrain per day, an area the size of South Korea or Iceland.[citation needed]