Yes, I go through T-3 Transfer all the time to go to the Star Alliance lounge with or without a boarding pass, it just a security check. Scan Lugguage and your on your way. Up the escalator on the left after scanning and your in the T-3 Departures area. I'm Star Gold and have access to the lounge..However, if your not departing on a Star Gold flight they won't let you in UNLESS you have an AMEX Platinum Card or Higher (which I do) or Priorty Passs. Last weekend I had no issues at all as I came in on Polaris on UA so I had arrival privileges. Long story short.. Star Gold, AMEX Platinumn or Higher or Priorty Pass will get you access. Good Bar and nice shower facilities . Best of all the people are nice there and a decent spread for food. I have been there more than 8 times in the past 12 months and enjoy the place..