My son was traveling as a UM with my roll-aboard and PM tags on it. He happened to be in 1st class and forgot to wait to exit with a FA. He simply walked off the plane with "my" bag and tag. A GA or FA then stopped him, scanned the PM tag and called my cell number to let me know that someone was walking off a plane with my bag. naturally, i straightened it out, but i also thanked her for her diligence. True story.