NORTHROP P-61 BLACK WIDOW

The Northrop P-61 Black Widow was the only American-built purpose
build night fighter to enter service during the Second World War, and
was one of the largest and most sophisticated fighter aircraft of its
era.
http://www.historyofwar.org/articles/weapons_northrop_P-61_developmen...

Although the Northrop P-61 Black Widow night-fighter didn’t enter
service until mid 1944 it did see combat in both the Pacific and
European theatres, and was in action for long enough to prove that it
was a successful design
http://www.historyofwar.org/articles/weapons_northrop_P-61_combat.html

The Northrop F-16A Reporter was an unarmed reconnaissance aircraft
based on the XP-61E Black Widow
http://www.historyofwar.org/articles/weapons_northrop_F-15_reporter.html

The Northrop P-61A was the first production version of the Black Widow
night-fighter, and the first version to enter combat.
http://www.historyofwar.org/articles/weapons_northrop_P-61A.html

The Northrop P-61B was the main production version of the Black Widow
night-fighter, with 450 being produced. Early production P-61Bs were
very similar to late production P-61As, but with an eight inch long
extension to the nose to allow the aircraft to carry the improved
SCR-720C airborne radar set.
http://www.historyofwar.org/articles/weapons_northrop_P-61B.html

The Northrop P-61C was the final production version of the Black Widow
night-fighter, and differed from earlier aircraft in having more
powerful turbo-supercharged engines.
http://www.historyofwar.org/articles/weapons_northrop_P-61C.html

The Northrop XP-61D was the second designation given to the two
prototypes for the up-engined P-61C Black Widow, and was adopted after
a series of engine changes.
http://www.historyofwar.org/articles/weapons_northrop_XP-61D.html

The Northrop XP-61E was a two-man long-range escort fighter version of
the Black Widow night-fighter originally developed to escort bombers
to Japan
http://www.historyofwar.org/articles/weapons_northrop_XP-61E.html

The Northrop XP-61F was the designation given to a planned two-seat
version of the Black Widow night-fighter.
http://www.historyofwar.org/articles/weapons_northrop_XP-61F.html

The Northrop P-61G was the unofficial designation given to sixteen
Black Widow night-fighters converted to perform as weather
reconnaissance aircraft.
http://www.historyofwar.org/articles/weapons_northrop_P-61G.html

The Northrop P-61H was the designation given to a version of the Black
Widow night-fighter that would have had the four gun turret replaced
by a large internal fuel tank
http://www.historyofwar.org/articles/weapons_northrop_P-61H.html

The Northrop F2T-1 was the designation given to twelve surplus P-61A
Black Widows used as training aircraft by the US Marine Corps
http://www.historyofwar.org/articles/weapons_northrop_F2T-1.html

Northrop XFT

The Northrop XFT was the first Northrop designed aircraft to be built
for the US Navy, and was an experimental all-metal low-wing monoplane
single seat fighter aircraft rather surprising based on the Northrop
Delta transport aircraft
http://www.historyofwar.org/articles/weapons_northrop_XFT.html

RAF Squadrons

No.71 Squadron was the first 'Eagle' Squadron, manned by American
volunteers in the year before the American entry into the Second World
War.
http://www.historyofwar.org/air/units/RAF/71_wwII.html

No.72 Squadron began the Second World War as a home based fighter
squadron, taking part in the battle of Britain and the offensive
sweeps over France, before moving to North Africa late in 1942. The
squadron remained in the Mediterranean to the end of the war, taking
part in the fighting on Sicily, in Italy and the invasion of southern
France.
http://www.historyofwar.org/air/units/RAF/72_wwII.html