Ali
No aircraft that has never done it's job can be said to have "proved its worth"
Go on then BEagle, instruct me on the error of my ways. Tell me how the world is indeed banana shaped......
At least the FAA has always known that our aircraft are mostly ****e with occasional good aspects. Anything else is just delusional in the UK forces, though at least more recently when a Typhoon comes to embelish you don't get bored waiting..............