Boeing B-17 Flying Fortress - La Fortaleza volante 

Fue un bombardero pesado cuatrimotor desarrollado para la usaac o el cuerpo aéreo del ejercito de los Estados Unidos que entro en servicio unos años antes de la Segunda Guerra Mundial. El Boeing B-17 Flying Fortress, o fortaleza volante, fue el tercer bombardero mas producido de todos los tiempos pero arrojo más bombas que cualquier otro bombardero estadounidense. Y se convirtió en todo un icono de la segunda guerra
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Fuentes fotográficas y de video:
By Airwolfhound - commons file, CC BY-SA 2.0,
By U.S. Air Force - from gallery.Originally uploaded in July 2008 to en:Wikipedia (log) by Signaleer (talk)., Public Domain
By U.S. Air Force - at gallery page, Public Domain,
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By U.S. Air Force at gallery page, Public Domain,
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By Unknown author or not provided - U.S. National Archives and Records Administration, Public Domain,
By U.S. Air Force Public Domain
By U.S. Air Force photo - Public Domain,
By Unknown author -, Public Domain,
By U.S. Air Force, Public Domain,
By U.S. Army Air Force - Public Domain,
By U.S. Air Force - Public Domain
By U.S. Air Force -, Public Domain,
By U.S. Navy - This media is available in the holdings of the National Archives and Records Administration, cataloged under the National Archives Identifier (NAID) 520602., Public Domain,
By U.S. Army Air Force - Public Domain,
By U.S. Army Air Force - a russian web site at [1], Public Domain,
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By Originally uploaded by ja:利用者:Yanagi774. - Moved from ja:画像:B17jp.jpg., Public Domain,
By United States Army Air Forces - Thompson, Scott (2011), Final Cut: The Post-War B-17 Flying Fortress and Survivors (4th Edition), Pictorial Histories & Aero Vintage Books ISBN-10: 1575101564, Public Domain,
By U.S. Air Force
By U.S. Navy; Originally uploaded in February 2009 to en:Wikipedia (log) by Signaleer (talk)., Public Domain,
By USCG - U.S. Coast Guard website [1], retrieved 2009-04-02, Public Domain,
De U.S. Air Force photo - Dominio público,
De U.S. Office for Emergency Management. Office of War Information. - Este archivo está disponible en la sede de la National Archives and Records Administration, catalogado bajo el identificador ARC (National Archives Identifier) 535972., Dominio público,
De Airwolfhound from Hertfordshire, UK - B17 - Chino Airshow 2014, CC BY-SA 2.0,

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