Now there's one more place where you could be watched — 30,000 feet in the air.

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

American and Singapore both say they have never activated the cameras and have no plans to use them. However, companies that make the entertainment systems are installing cameras to offer future options such as seat-to-seat video conferencing, according to an American Airlines spokesman.

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A passenger on a Singapore flight posted a photo of the seat-back display this week, and the tweet was shared several hundred times. BuzzFeed first reported that the cameras are on American planes, too.