It was just announced that the US TSA (Transportation Security Administration) will subject airline passengers carrying remote controlled toys (and their remotes) to additional screening at all airports. This is effective immediately.
The toys include remote controlled cars and trucks, etc. It's reasonable to believe this procedure will soon be adopted by security at airports in other countries.
At this point, it won't affect cruise ships, but of course, a large percentage of cruise passengers fly to their port city.