logistics.. its amazing that MORE luggage isn't lost on a daily basis. I traveled every week for 10 years, lost my bag maybe 4 times? usually around a holiday where the airports are burdened with extra people (and 75% of those lost bags were out of O'Hare... )

sure it seems simple take a bag put it in a tube, take it off the tube give it back to the person.. but man, probably 30 people touched that bag in that process, countless conveyer belts, several trucks.. add in TSA and it doubles the handling