The ones in Athens are thin white cards and as such easy to see the aerial through it. Additionally there's no slot to put it through, and a big tap surface at

The ones in Athens are thin white cards and as such easy to see the aerial through it. Additionally there's no slot to put it through, and a big tap surface at each gate with the RFID logo with someone tapping a card on it.[1] I think it would be hard to miss for anyone familiar with the concept of tapping cards. [1] https://www.athenstransport.com/english/tickets/ https://www.athenstransport.com/english/tickets/