Centurion Lounge entry rules tightened: guests must be traveling on the same flight as the cardholder (previously any same-day flight), and layover arrivals are capped at 5 hours before the connecting flight (standard entry stays within 3 hours of departure). Applies to US, London, Hong Kong and Tokyo lounges.
Live figures on the Amex Platinum page always reflect what's true today — announced changes are flagged here, never silently pre-applied. Source: issuer / reporting.