Which aircraft feature stock exterior cameras? Watching a video on YouTube of an A340-600 takeoff, I noticed that it has at least two exterior cameras &mdash; one for lining up the nosewheel, and the other on the tailfin:


                
            

After the NTSB recommended the use of exterior cameras in 2012, I'm wondering how widespread these are? Which models of Airbus aircraft have them? Do any Boeings?

Do these record or are they realtime-only?
I fly the A320 and 321 which, at our company, had been equipped with nose cameras. The pictures, though, where just used for passenger entertainment during takeoff and landing and keep being disconnected by maintenance when failed due to high spare parts costs.