Originally Posted by cornellstudent
I use my AAdvantage Plat card when I'm in the Business class checkin line for an economy ticket or when I'm doing the self-checkin kiosks. Who knows what information they store when you swipe your credit card in one of those things!
Almost certainly no information is stored - and there's nothing on there they don't already know about me since I use that credit card to purchase tickets, and they already know all my contact information and even my flight history. I agree there may be privacy concerns with the databases they use or information I've shared, but self-checkin kiosks are not the weak point in the system.