http://www.keystoneaviation.com/blog/7-airplane-fun-facts/
http://www.historylearningsite.co.uk/jet_engine.htm
http://www.concordesst.com/faq.html
www.HuffingtonPost.comhttp://www.commondreams.org/headlines05/1128-04.htm
http://web.archive.org/web/20090428162415/http://www.lockheedmartin.com/products/f22/f-22-requirement.html
www.gulfstream.com
http://www.historylearningsite.co.uk/jet_engine.htm
http://www.concordesst.com/faq.html
www.HuffingtonPost.comhttp://www.commondreams.org/headlines05/1128-04.htm
http://web.archive.org/web/20090428162415/http://www.lockheedmartin.com/products/f22/f-22-requirement.html
www.gulfstream.com