However I read the question as about close air support.
Sorry Gerz where I come from close air support means CAS. Where did the possibility of carpet bombing suddenly appear from?
I love your post where you say are leaning towards an SS solution. The original poster wondered about supersonic as opposed to subsonic. So I guess both are SS. Nice fence sit.
Bit like my daughter who was navigating me as we drove in a car. We got to a T junction I said L or R and she said which ever you prefer.
I am off for a bit so nobody should take offence if I leave this thread.