No, an American Express Platinum or Centurion card does not grant access to United Polaris Lounges. Access to Polaris lounges is strictly restricted to passengers traveling in a long-haul United Polaris business class seat or a partner airline's International First/Business Class cabin on a Star Alliance carrier. While the Amex Global Lounge Collection provides access to The Centurion Lounge, Delta Sky Clubs (when flying Delta), and thousands of Priority Pass lounges, it does not bypass the "ticket-only" requirement for United’s premier international lounge product. To enter a Polaris lounge in 2026, you must have the specific class of service printed on your boarding pass; even United's own high-tier "United Club" memberships or "Star Alliance Gold" status do not provide entry to the Polaris-specific facilities.