Smile: Some airliners have cameras on seat-back screens

Now there is one more place where cameras could start watching you - from 30,000 feet (9,140 meters).

Newer seat-back entertainment systems on some airplanes operated by American Airlines, Delta Air Lines, United Airlines and Singapore Airlines have cameras, and it's likely they are also on planes used by other carriers.

All four airlines said that they have never activated the cameras and have no plans to use them.