Sadly, the PLAT luggage tags were dropped a couple years ago.

on the upgrades, this has nothing to do with PLAT, but you should get 4 upgrade credits added to your electronic account for every 10,000 miles flown.

To use them you'll need a electonic upgrade cert for each 500 miles of the trip you're upgrading (and of course the upgrade seat needs to be available).

Welcome to PLAT.