I've used ME for Song and Jetblue.
We attached our tags to the bags and dropped them at the departing airport check-in. They were 'magically' in our room later that day. I think they just had the resort on the label.
Upon return, we checked in at the airline desk at the resort and they took our bags and printed our airline boarding passes. I do believe the ME booklets did have our airline info printed in it. To be safe, you may want to check with MS to make sure they have the proper flight info for you. They use the flight info to determine departure times for the bus.