American-Express-Platinumkarte :
Lufthansa lounge just for frequent flyers
Picture Alliance
Lufthansa grants American Express Platinum cardholders entry to its airport lounges. However, this may quickly be over. Frequent flyers need and may maintain to themselves.
https://www.faz.net/aktuell/finanzen/american-express-lufthansa-lounges-bald-tabu-200719865.html