List of military aircraft of the United States
... Vultee XP-55 Ascender - Curtiss XP-56 Black Bullet - Northrop XP-57 - Tucker XP-58 ... Airacomet - Bell P-60 - Curtiss P-61 Black Widow - Northrop XP-62 - Curtiss P-63 Kingcobra ... Ryan FT - Northrop (version of A-17) F2T Black Widow - Northrop (version of P-61) ...
http://en.wikipedia.org/wiki/List_of_military_aircraft_of_the_United_States - 92k - Cached - Similar pages

List of aircraft (N-S)
... 20 Tigershark Northrop F-89 Scorpion Northrop F2T Black Widow Northrop HL-10 Northrop N-9M Northrop N3P Northrop Nomad Northrop P-61 Black Widow Northrop P-64 Northrop RF-5 ...
http://en.wikipedia.org/wiki/List_of_aircraft_(N-S) - 30k - Cached - Similar pages

List of airplanes (N-S)   (translated from Portuguese)
... 20 Tigershark Northrop F-89 Scorpion Northrop F2T Black Widow Northrop HL-10 Northrop N-9M Northrop N3P Northrop Nomad Northrop P-61 Black Widow Northrop P-64 Northrop RF-5 ...
http://pt.wikipedia.org/wiki/Lista_de_aviões_(N-S) - 24k - Cached (Portuguese) - Wikipedia (Portuguese) - Similar pages