In the spirit of "there's no such thing as a dumb question" maybe this thread might have legs to pose unrelated questions generally or outside of a current thread.. We have some incredibly knowledgeable people here and I'm sure the group here makes it a decent place to ask and who knows what interesting discussions might unfold.. So... I'll go first.. I was reading the specs of the F-35 and see it has listed top speed of Mach 1.6 ..where does such supersonic testing take place? I was of the understanding it wasn't presently allowed over continental US? so maybe in remote areas and for military testing it is? ..and on a related note.. with the various proposed revivals of supersonic transport where would THEY test if they got to that stage?