Yes, you can generally access the American Airlines Admirals Club without your physical membership card, provided your AAdvantage number is linked to your flight reservation. In 2026, the check-in process at most lounges is fully digitized; the agent at the front desk will simply scan your boarding pass, which should automatically display your membership status or your eligibility through a qualifying credit card (like the Citi / AAdvantage Executive World Elite Mastercard). If it doesn't show up, they can look you up manually using your government-issued photo ID and your loyalty account number. For those accessing via ConciergeKey status or international premium cabin tickets, the boarding pass serves as the "key" to the door. If you are a guest of a member, you must enter at the same time as the primary cardholder. While having the physical card is a good backup, the integration of digital profiles into the airline's "app-first" ecosystem means your biometric or digital identity is usually all you need to enter.