I'm not sure its supposed to but it happens.Just curious about the luggage. I didn't think the airlines would allow luggage to fly without the owners. In fact, I think I read something recently about flights being delayed because the airline had to remove the luggage of folks who got caught in security lines and didn't make the flight.
I arrived in Albany once when two flights from DC to Albany got delayed to be within 30 min of each other. Despite me having been in DC for several hours I was on the first flight and my luggage on the second.
Several people's luggage was on the wrong flight, it was like they just randomly loaded them.
Another time I arrived to have a bag missing. It was found and came in on the next flight which I obviously wasn't on.
I have also seen bags get pulled into the office that were tagged for different airports entirely.