Sky Sentinel is an unmanned aerial vehicle (UAV) airship designed for long-duration operation of an automated surveillance platform. The airship flies at altitudes up to and can remain aloft for up to 18 hours. It carries a sensor suite payload of up to . The airship is long and contains of helium to provide lift. A follow-on model—Sky Sentinel 2— is planned to support flying at altitudes up to while remaining aloft for up to 26 hours with a sensor suite. References Airships of the United States Unmanned aerial vehicles of the United States