To prove your Star Alliance Gold status at an airport in 2026, you primarily use your digital membership card found within the mobile app of your specific frequent flyer program (such as United MileagePlus, Lufthansa Miles & More, or Singapore Airlines KrisFlyer). This digital card will prominently feature the Star Alliance Gold logo (a gold star inside a circle). When you scan your boarding pass at a lounge or priority boarding gate, the system should automatically recognize your status; however, it is a vital standard practice to have the app open as a backup. In 2026, most major airlines have phased out physical plastic cards in favor of "Eco-Friendly" digital identities. If you are using a partner airline lounge (e.g., using your United Gold status to enter a Lufthansa lounge), the staff will scan your digital QR code. Always ensure your frequent flyer number is correctly linked to your reservation before you check in, as this allows the "Star Gold" designation to be printed directly onto your boarding pass, serving as your primary and most seamless proof of status.