My apologies for not denoting whether this is a FedEx or UPS thread since I can't make up my own mind yet what it is and the article I have linked talks about both, as well as these new-fangled luggage specialists.
Like everyone else, I am tired of airlines losing my checked luggage and I can't very well pack my kitchen sink and 15 pairs of shoes into my carry on . So I have thought of shipping my luggage on my next trip to SAT. The article says UPS, at least, doesn't want to get into the luggage shipping business. What's a girl to do, other than leave 14 pairs of shoes behind!