What I said above.
I'm not saying they should nerf it until it becomes useless, or anything like that, instead they should atleast make it's main use actually usable.
When people think of aircraft carriers, they think of a boat that carries aircraft, however, in Rise of Nations, even if there is aircraft on a carrier, if that carrier moves, the aircraft won't even follow, and soon enough lose fuel. Even just the least you could do is make a button on the carrier that allows every plane adjacent onto it to follow it. Or just make it automatic by default.
bonus: transport aircraft should be able to carry more troops