line borders the R lot's rear line, setback must be at least. The redesign delayed the B-2's first flight by two years and added about US1 billion to the program's cost. Archived from the original on 1 November 2013. "B-2s return to flight after safety pause." US Air Force, Retrieved: 1 December 2010. Archived from the original. "US to add one B-2 plane to 20 plane fleet." Washington Post,. Aviation firms about the largest radar cross-section of an aircraft that would remain effectively invisible to radars. Mehuron, Tamar., Assoc. Weapons of Mass Destruction: An Encyclopedia of Worldwide Policy, Technology, and History, Volume. The display airframe is marked to resemble The Spirit of Ohio (S/N 82-1070 the B-2 used to test the design's ability to withstand extreme heat and cold. 3 The B-2 may cost up to 135,000 per flight hour to operate in 2010, which is about twice that of the B-52 and B-1. 340341 a b c d e f Chiles, James. 130 The B-2s flew directly from the.S. B-2s have made periodic appearances on ground display at various air shows. Retrieved: Linch, Airman 1st Class b2 convocator Stephen. It is speculated to have an upward-facing light sensor which alerts the pilot to increase or reduce altitude to match the changing illuminance of the sky. Though designed originally as primarily a nuclear bomber, the B-2 was first used in combat dropping conventional, non-nuclear ordnance in the Kosovo War in 1999. "The Stealth Bomber Elite". Measurements of the Radar Echoing Area of the Vulcan by the Optical Simulation Method. "The Northrop B-2A Stealth Bomber." America's Stealth Fighters and Bombers: B-2, F-117, YF-22, and YF-23. Croddy, Eric and James.