In a statement, Delta said that its cameras “are not functional” and the airline “does not have any plans to install the necessary software to use them.”

Last week, American Airlines told BuzzFeed News that the cameras were included for potential future uses “such as hand gestures to control in-flight entertainment,” but “have never been activated, and American is not considering using them.”

While the airlines insist that the optical hardware isn’t spying on passengers, stickers or camera covers could quell customers’ privacy concerns.

The seat-back cameras, if hacked or used to surveil, would likely just capture you sleeping in an uncomfortable position or eating snacks while watching a movie. Still, some fliers said that in a world where their actions and whereabouts are already being constantly surveilled and sold to third parties, they’d rather eliminate the possibility of being watched on a flight. In October 2018, the Transportation Security Administration touted the agency’s plans to incorporate more biometric technology in airports, including facial recognition in partnership with US Customs and Border Protection.

“Do I expect to have the same level of privacy in an aircraft like I have at home, of course not. Still wish not to be monitored if possible,” said Twitter user @dacoolx.

Another user, @skyrme_katrin, said, “Or at least informed of the existence of such cameras.” Before passengers noticed the cameras, the airlines had not disclosed them.