As you said, planes, which are bad examples because a kite won't have an airspeed anywhere close to 200 kts.
The cable itself is problematic. Like the submersible, the cable will have to withstand high tension, so it must be decently thick. The kite would not only have to lift the radars, but it would also have to lift the cable. The kite would be huge, and a huge kite for carrying large loads requires strong frames, which implies extra weight on the kite, meaning the kite would be even larger.
You would end up with a kite that is the size of an actual AWAC and doesn't fit on a ship. So what is the point?