Three large airlines have admitted to installing cameras pointing directly at passengers.
A furore over the cameras began when passenger Vitaly Kamluk noticed a tiny pinhole camera inside his in-flight entertainment system and posted it on Twitter.
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"Just found this interesting sensor looking at me from the seat back on board of Singapore Airlines. Any expert opinion of whether this a camera? Perhaps @SingaporeAir could clarify how it is used?," he wrote.
Singapore Airlines was quick to respond, confirming that it was in fact a camera, but it had not been connected or turned on.
"We would like to share that some of our newer in-flight entertainment systems provided by the original equipment manufacturers do have a camera embedded in the hardware," the airline said on Twitter.
"These cameras have been disabled on our aircraft, and there are no plans to develop any features using the cameras."
It later added the cameras were provided by the original equipment manufacturers.
American Airlines and United Airlines have also admitted to having the cameras on board, The Independent reports.
"Cameras are a standard feature on many in-flight entertainment systems used by multiple airlines," an American Airlines spokesperson told The Independent.