US Air and Southwest don't participate, at least I didn't recall them being on the list when we went. Always a good idea to check. DU or SWV travel websites should have up to date info. We LOVED using ME! Luggage is a big hassle and it was great to just drop it off and forget it. We used it coming and going (jetBlue). If your airline participates, I would use it! 


But be sure YOUR airline is on the list. 2 families showed up behind us that there airlines where NOT on the list. It is only certain airlines. The big ones. I flew TED (united) and did so on purpose for this service, well worth it.
