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2. The Cost To Operate and Maintain Air Force One - AOL

   www.aol.com/cost-operate-maintain-air-force...

   As is so often the case, an already big number kept getting bigger and by 2019, Air Force Magazine was reporting that the new planes were expected to cost $5.2 billion. Their 100,000-plus page ...

3. Boeing VC-25 - Wikipedia

   en.wikipedia.org/wiki/Boeing_VC-25

   The Boeing VC-25 is a military version of the Boeing 747 airliner, modified for presidential transport and commonly operated by the United States Air Force (USAF) as Air Force One, the call sign of any U.S. Air Force aircraft carrying the president of the United States. Only two examples of this aircraft type are in service; they are highly ...

4. Air brake (road vehicle) - Wikipedia

   en.wikipedia.org/wiki/Air_brake_(road_vehicle)

   Air brake (road vehicle) An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to both release the parking/emergency brakes in order to move the vehicle, and also to apply pressure to the brake pads or brake shoes to slow and stop the vehicle.

5. Westinghouse Air Brake Company - Wikipedia

   en.wikipedia.org/wiki/Westinghouse_Air_Brake_Company

   The Westinghouse Air Brake Technologies Corporation (sometimes nicknamed or abbreviated WABCO although this was also confusingly used for spinoffs) was an American company founded on September 28, 1869 by George Westinghouse in Pittsburgh, Pennsylvania. [5] Earlier in the year he had invented the railway air brake in New York state.

6. BE-4 - Wikipedia

   en.wikipedia.org/wiki/BE-4

   The BE-4 (Blue Engine 4) [4] is an oxygen-rich [5] liquefied-methane-fueled staged-combustion rocket engine produced by Blue Origin. The BE-4 was developed with private and public funding. [6] The engine has been designed to produce 2.4 meganewtons (550,000 lbf) of thrust at sea level. [7]

7. Air Force One - Wikipedia

   en.wikipedia.org/wiki/Air_Force_One

   SAM 29000, one of two VC-25As used as Air Force One, approaching Dayton International Airport in October 2012. Air Force One is the official air traffic control designated call sign for a United States Air Force aircraft carrying the president of the United States. The term is commonly used to denote U.S. Air Force aircraft modified and used to ...