From what I have heard, sometimes it's profitable for airlines to offload your luggage in-favor of some cargo item, since the person sending that cargo is payin

From what I have heard, sometimes it's profitable for airlines to offload your luggage in-favor of some cargo item, since the person sending that cargo is paying more than you are or is a large customer or that cargo has to be somewhere within 24 hours. This way, the airlines make money. Even inn cases they have to pay out a per-day amount/ compensate you for lost luggage -- they come out ahead on the money they make via sending someone else's cargo.