Airport lounge access has become increasingly competitive, and American Express is the latest issuer to announce changes. According to information shared with TPG, the issuer will change its Centurion Lounge access rules beginning July 8. Related: Everything you need to know about Amex Centurion Lounge accessCenturion Lounge guest access updatesThe new policy includes two key changes. This brings Centurion Lounge access more in line with policies already in place at many other airport lounges. The changes will apply to the American Express Platinum Card®, The Business Platinum Card® from American Express, the American Express Corporate Platinum Card®, the Delta SkyMiles® Reserve American Express Card and the Delta SkyMiles® Reserve Business American Express Card.