Lockheed P-3 Orion —

This "non-existent" P-3 Orion is thought to be testing equipment for a major defense contractor. It has a Littoral Surveillance Radar System (LSRS) attached to the bottom of it's fuselage. The aircraft itself has no serial or identifying markings other than the US Navy logo.

More here: http://www.p3orion.nl/sneaky.html