The breached data contains clear text credit card numbers along with the associated names, addresses and expiry of over 27,000 of its users from 2006-2015.
The leak in total contains over 100,000 user accounts
About 27,000 of them have links to credit card details which are stored in complete clear text.
Source: https://www.databreaches.net/clear-text-credit-cards-stolen-from-thefly-com/
"id": "THE2322622",
"linkid": "theflynews",
"type": "Vulnerability",
"date": "01/2018",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization's existence"