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.
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Delta, as well as other airlines, said they didn't add the cameras – manufacturers embedded them in the entertainment systems. Certain seat-back entertainment systems on Delta flights, as well as other airlines, have cameras, but the airlines say they're not watching you.
Two of the three, JetBlue and Delta, offer seatback screens on most flights, which are not just for watching free movies, but for other forms of entertainment including — depending on the flight — browsing digital magazines, following guided meditations and more.
Travelers frequently bring cameras because they can use them to record their memories of their journeys and experiences. However, a lot of people are unclear as to whether or not cameras are permitted past airport security. Yes, cameras can pass through airport security, to give the quick answer.
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.
In commercial aviation, a red-eye flight refers to a flight that departs at night and arrives the next morning, especially when the total flight time is insufficient for passengers to get a full night's sleep.