Interesting. The other day the fabulous Mrs. Xyzzy was heading out on an EWR-SLC flight. At the gate we asked the agent to reprint her boarding pass (gotta have cardboard, ya know ) A replacement boarding pass was procured, but we realized something was wrong when we looked at it. Her seat had suddenly changed from 1B to 1A. We complained and were given a funny look by the agent. It took him a whole pile of keystrokes but after pressing the issue another 1A boarding pass was procured. We have no idea what was going on, but someone/something had clearly moved her.