Baggage liability is not just a Delta issue, anymore than most of these are, but if airlines have more (not total) responsibility for baggage handling, they are well-positioned to demand improvement. Of 47 connections I have had through MIA, my bags have made it with me, to my destination, without theft or damage, twice. I now avoid this airport and, as a result, American, like the plague. AA has to have some power in decisions here...