I have had the same problems with my luggage tags. It works great with Lufthansa and my bags are always the first off the chute. The last time I came in to Chicago, my bags were the last ones off along with all the other priority bags! All of us were complaining (1K's included). Since then, I have flown here domestically and never once have my bags been marked priority. Looks like UA has some work to do in catching up with its' SA partners.