It's difficult to define that. At the start of WW1 all sides had aircraft that 'observed'. After a while they put guns on them, did that make them fighter aircraft. The German 'Eindekker', the French Nieuport 'Bebe' and the British Vickers FB5 were possibly the first aircraft built where observing was a secondary use.
Who is to say what is the "world's best fighter plane" - there are many criteria to judge this by.
The first operational fighter plane was the Vickers F.B 5 "Gun Bus".
1910
SPAD was a French fighter plane in WW1. The Spitfire was a WWII fighter plane.
The first real fighter plane was the Fokker E1, designed by Antoine Fokker in 1914.
The first real fighter plane was the Fokker E1, designed by Antoine Fokker in 1914.
The SR 71 Blackbird is the fastest plane in the world
MiG-25
Eurofighter Typhoon
That is impossible to say,as there is little definition as to exactly WHICH aircraft was the first fighter .
The lightest palne was a dog plane
The possessive form of 'the wingspan of the fighter plane' is the fighter plane's wingspan.