American Express Platinum card does not offer priority boarding. Priority boarding is a benefit that allows cardholders to get to their seat sooner than general boarding groups. The only American Express card that offer priority boarding is Amex Delta Platinum.

No, the standard American Express Platinum Card does not grant you universal priority boarding across all airlines. Priority boarding is typically a perk reserved for airline-specific "co-branded" credit cards (like the Delta SkyMiles Platinum or United Quest card) or for those with elite frequent flyer status. However, the Amex Platinum does provide a form of "priority" through its Global Lounge Collection, giving you access to Centurion Lounges, Delta Sky Clubs (when flying Delta), and Priority Pass lounges, allowing you to wait in luxury until the final boarding call. Furthermore, if you use your Amex Platinum "Fine Hotels + Resorts" benefits, you may get "priority" treatment at your destination, but not on the aircraft itself. The only way the Amex Platinum helps with the boarding process is if you use the card's "Airline Fee Credit" to purchase a boarding upgrade on a specific flight, but it is not an automatic, baked-in benefit of the card like it is with many carrier-specific credit cards.