Grumman F9F Panther - Wikipedia

Grumman F9F-2 Panther, 123557, VFW Post 1621 : ABPic

What was the reason for the lack of modern fighter jets during World War II, despite the fact that they had already been invented by that point? Was it due to cost

Aerial Visuals - Airframe Dossier - Grumman F9F-2B Panther, s/n 123078 USN, c/n 123078, c/r N9525A

Grumman F9F – Wikipedia

Sharpening its Claws

Had the US developed and deployed a jet fighter by the end of WW2? - Quora

Grumman F9F Panther - Wikipedia

Grumman F9F Panther – Seznam.cz

Had the US developed and deployed a jet fighter by the end of WW2? - Quora