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North American P-51 Mustang North Carolina (lớp thiết giáp hạm) Northrop Grumman B-2 Spirit Northrop F-5 North American F-86 Sabre Northrop Grumman RQ-4 Global Hawk North American B-25 Mitchell Northrop P-61 Black Widow Northern Premier League 2014–15 North American F-100 Super SabreTài liệu tham khảo
WikiPedia: Northrop_Grumman_B-2_Spirit http://www.airforce-magazine.com/MagazineArchive/M... http://www.airforce-magazine.com/MagazineArchive/P... http://www.airforce-technology.com/projects/b2/ http://www.cleveland.com/nation/index.ssf/2010/06/... http://www.flightglobal.com/blogs/the-dewline/2008... http://www.howitworksdaily.com/technology/b-2-stea... http://www.as.northropgrumman.com/products/b2spiri... http://www.nytimes.com/1997/08/23/world/the-2-bill... http://www.pacificnewscenter.com/index.php?option=... http://www.youtube.com/watch?v=_ZCp5h1gK2Q