For single player, I would love to see my aircraft shows signs of the last fight I was in, for example if I took a few MG hits I would love to see signs that my spitty had been patched up ready for the next sortie, and the weathering being more pronounced as the bird gets older, so you that you kind of become attached to your aircraft. It would also be good if your kills got painted on to your bird aswell. I dont think this would be to difficult to include and again maybe it already is.