Of Choppers I'm sure they do, but admit I've never tested it with gravships. However if it works for two air chassises, I guess it'll work for the third too.
Quick question. I bet everybody but me knows this, but can chopters and grav ships scramble air defenses, like interceptos? I know needlejets can with air superiority, but never actually had an attack by a bomber where one of my intercepting grav ships or copters was in range?