Official rules from Star Alliance Employees portal (no password required):
https://portal.staralliance.com/empl...ports/branding
Star Alliance Gold (SAG) Customers Travelling in any Class:
Customers have access to any Star Alliance member carriers' owned lounges with the Star Alliance Gold logo at the entrance. To gain access:
• The Customer must present a boarding pass for travel on a Star Alliance flight departing from the local airport.
• The Customer must present proof of SAG-level status. This is indicated on the boarding pass by XX*G, where XX is the carrier code of the carrier with whom the customer has SAG-level status. If the boarding pass does not show this, but the customer can prove Star Alliance Gold status via a valid frequent flyer programme SAG-level card, access must be granted. In cases where the customer does not have the physical card, another valid indication of SAG-level status can be accepted.
• Where a discrepancy exists between the loyalty status levels displayed on the frequent flyer programme card, boarding pass, other document presented and/or the Star Alliance Premium Customer Database, the highest displayed level will be honoured. For example, boarding pass shows xx*S (xx = airline code *S=Star Alliance Silver), but customer presents a valid FFP card showing the Star Alliance Gold logo: customer must be given access to the lounge.
If in doubt, it is best to consult an airline representative before turning away a customer. A Star Alliance Gold customer who qualifies for lounge access is entitled to bring one guest, who must also have a boarding pass for a Star Alliance flight leaving from the relevant airport the same day.
Note: United Airlines customers may only access the United Clubs within the U.S. when travelling in conjunction with a Star Alliance international flight.
• Customer must also present a boarding pass for travel on a Star Alliance flight departing from the local airport.
• Customer is entitled to one guest.