To enter an American Express Centurion Lounge in 2026, you must hold a valid Platinum Card®, Business Platinum Card®, or Centurion® Card. Upon arrival, you are required to present your physical or digital card, a government-issued ID, and a same-day boarding pass showing a confirmed reservation. Most locations enforce a "3-hour rule," meaning you can only enter within three hours of your scheduled departure time, unless you are on a connecting flight. Access is generally not granted upon arrival at your final destination. In 2026, guest policies remain strict: Platinum cardholders must typically pay a fee for guests (around $50 per adult) unless they meet a significant annual spending threshold (usually $75,000). For other lounges in the "Global Lounge Collection," such as Delta Sky Clubs or Priority Pass lounges, specific enrollment in the benefit via the Amex app is often required before your first visit.