What is the purpose of this Lock on the overhead luggage door. Only this overhead luggage door has this Lock. The plane i found this on was an Delta Airlines A220, tail number N116DU.
Maye for special belongings which need to remain in the aircraft or luggage for the crew.
Some people like to place stickers of wall outlets on walls then laugh and watch as people try and plug things into them. I on the other hand like to cut the faces off locks and put double sided tape on them then place them in random locations. Since I like to sit in the back of planes it might have been one I was on at some point.