A-wings I do contest because they did have fairly large roles in the one film they were in.
Maybe, but is that enough to be considered Iconic? I think that's a term that is misused. To me an Iconic ship is one that if you were to show a picture of it to 10 random people on the street at least 6-7 would know where it came from and maybe what it was.
But... but Arvel's sacrifice...