Why are there no cameras on an airplane?

I'm reliably informed that at least some airlines have in-cabin video for various purposes, security being foremost among them. read more

Smartphones pack an amazing camera into such a small amount of space, multiplied by the amount of passengers in the aircraft, there will be quite a number of cameras on the plane. If that is not enough cameras, some newer aircraft feature cameras outside the fuselage that passengers sometimes are able to view. read more

Yes, most airlines do install security cameras onboard their huge airliners. Cameras are installed outside the cockpit, so that the pilots can see who wants to enter the cockpit before unlocking the doors and for other security purposes. read more

It would cost at least $100,000,000 to do this (10,000+ commercial planes, $10,000 a plane) and would do pretty much nothing. The hysteria behind your question is exactly what has justified the hundreds of thousands of cameras already around that do nothing. read more