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Call sign SCAT21, tail number N281PR, Scaled Composites 281 Proteus aircraft up from Mojave Air and Space Port/Civilian Flight Test Center.
The Scaled Composites Model 281 Proteus is a tandem-wing High-Altitude Long Endurance aircraft designed by Burt Rutan to investigate the use of aircraft as high altitude telecommunications relays. The Proteus is actually a multi-mission vehicle, able to carry various payloads on a ventral pylon.
Scaled Composites Proteus has an extremely efficient design, and can orbit a point at over 19,800 m for more than 18 hours. It is currently owned by Northrop Grumman.
Moar at:
https://en.wikipedia.org/wiki/Scaled_Composites_Proteus
Some who ascribe a specific domain to Proteus call him the god of "elusive sea change"
Moar at:
https://en.wikipedia.org/wiki/Proteus