Why have I never seen CCTV footage from an airliner? There's CCTV on trains, buses, uber, but not on planes? And don't say "to save on weight" because how much can a fucking camera weigh.

This would have many benefits:
- analyze which part of the hull breached before the plane disintegrated or see which passenger detonated his west
- during an evacuation see how crowds act under stress and whether attendants did everything by the book, rather than rely on their oral statements "yeah, we did everything correctly" and see which passengers took overhead luggage to fine them
- determine who started a brawl
- observe generally suspicious behavior, for example secret agents spiking a drink of a political opponent or an heir shooting a poison arrow at their parent across the aisle to inherit wealth
- relay hijackers' positions to a SWAT team about to storm the plane