The US Air Force's top-secret RAT55 jet was spotted soaring over Area 51 in Nevada, confirming rumors that this enigmatic radar plane operates from the clandestine Groom Lake facility. >>> Minutes after landing, the RAT55 was linked to Hangar 18, Area 51's largest and most mysterious hangar, as its massive sliding doors were seen open, suggesting the jet had taxied inside. The RAT55, distinguished by its 'fat nose,' 'hump on the top,' 'hump on the belly,' and 'big protrusion in the back,' is a specialized aircraft designed for in-flight radar cross-section testing. >>> RAT55, short for Radar Airborne Testbed, with...