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WikiPedia: Boeing_E-4 http://www.boeing.com/commercial/747family/pf/pf_c... http://www.boeing.com/defense-space/military/e4b/ http://www.boeing.com/history/boeing/e4.html http://news.cnet.com/8301-13576_3-57594992-315/abo... http://books.google.com/books?id=bFXoPAAACAAJ&dq=t... http://www.journalof911studies.com/volume/200704/G... http://www.theaviationzone.com/factsheets/e4.asp http://www.faa.gov/regulations_policies/orders_not... http://www.af.mil/information/factsheets/factsheet... http://www.globalsecurity.org/wmd/systems/e-4b.htm