Your Amex Platinum card comes in very handy if you are transiting via Madrid’s international airport (MAD) and want free fast-track screening of your carry-on luggage.

How fast is the dedicated Amex Platinum screening?
I noticed the lines to be much shorter compared to the traditional priority screening (for Business/First and Airline Status). We showed our Platinum cards to the agent and he inspected for the matching names on boarding passes and let us through the side gates.
Do you need one Platinum card for each passenger for fast-track entry?
Yes. You must have a discreet Platinum card for each passenger utilizing the fast-track luggage screening at Madrid airport.
Conclusion
Whether you are flying in business or economy, I encourage readers to utilize the Amex Platinum’s Fast Track screening at Madrid airport. I never travel without my Amex Platinum when traveling overseas due to the wonderful free benefits like emergency medical transportation & evacuation and repatriation (review).