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The Boeing VC-25 is the designation of a United States Air Force passenger transportation aircraft, a military version of the Boeing 747 airliner. The two modified Boeing 747s are designated VC-25A by the USAF. The VC-25 is most famous for its role as ''Air Force One'', the call sign of any U.S. Air Force aircraft carrying the President of the United States. The two aircraft currently in U.S. service are highly modified versions of Boeing's 747-200B, with tail numbers 28000 and 29000. Although the ''Air Force One'' designation technically applies to the aircraft only while the President is aboard, the term is commonly applied to the VC-25s more generally. They often operate in conjunction with ''Marine One'' helicopters that ferry the President to airports in circumstances where a vehicle motorcade would be inappropriate. ==Development== By 1985, the pair of Boeing 707-based VC-137s used as the Presidential aircraft had been in service for 23 and 13 years respectively, and the USAF began searching for an eventual replacement. The Request for Proposal issued stated that the aircraft to be selected should have at least three engines and an unrefueled range of at least . Both Boeing with its 747 and McDonnell Douglas with the DC-10 were in competition to be selected, with the Boeing entry the eventual winner.〔Thomas, H. ("U.S. considers Air Force One from Airbus." ) ''heraldnet.com''. Retrieved: June 26, 2009.〕 The fabrication of the current 747s began during the presidency of Ronald Reagan (1981–1989). Reagan ordered two identical Boeing 747-200Bs to replace the Boeing 707s that he used for transport.〔Williams, Rudi. ("Reagan Makes First, Last Flight in Jet He Ordered." ) ''United States Department of Defense'', June 10, 2004. Retrieved: July 28, 2013.〕 The VC-25s were completed in 1986 and first flew in 1987.〔Jenkins 2000, pp. 55–56.〕 The interior designs were created by First Lady Nancy Reagan, who used designs reminiscent of the American Southwest.〔 Problems with interior wiring for communication systems delayed delivery of the two aircraft until 1990,〔 during the administration of George H.W. Bush. The VC-25 is not compliant with Automatic Dependent Surveillance Broadcast (ADS-B) standards; the Air Force is upgrading both airplanes. The Air Force reported that the operating cost for each VC-25A is $210,877 per hour.〔Butler, Amy, and Guy Norris, "Foregone Conclusion", Aviation Week and Space Technology, 9 June 2014, pp. 40-41.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boeing VC-25」の詳細全文を読む スポンサード リンク
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