To get free airport lounge access with a Mastercard in 2026, you must hold a premium tier card, specifically a Mastercard World or Mastercard World Elite. These cards typically provide membership to the Mastercard Travel Pass program (powered by DragonPass) or LoungeKey. To activate this, you usually need to register your card on the "Mastercard Travel Pass" app or website. Once registered, you will receive a digital QR code that acts as your entry pass to over 1,300 lounges globally. It is crucial to check if your specific bank offers "Unlimited" visits or a set number of "Complimentary" visits per year; some mid-tier cards may give you the membership for free but require you to pay a discounted fee (approx. $32) per visit. Many high-end travel cards, like the Citi® / AAdvantage® Executive or various "Black" cards from international banks, include unlimited free access for the cardholder and often one or two guests. Always check your "Benefits" portal before traveling, as many people have this perk and never realize they need to register their card to use it.