A smart airline, with ticket desks (oops LH...) could run a campaign that requires prospective applicants to bring the cards they wish to match to an ATO. Staff verify ID, Membership. It would cut out a lot of fraud because it's a whole other game to print fake cards or spoof Passbook cards.

But ticket desks cost money...staff are €€€ and that's why they all need to be closed and limited to XBAG's.