Cyberattack Targeted Seats and Delta Customers Both companies were notified of the attack last month, in which credit card information as compromised through [24]7, an online support service company. Sears Holding Corp said “less than 100,000 of our customers’ credit card information" but Sears-branded credit cards were safe. Delta issued its own statement: At this point, even though only a small subset of our customers would have been exposed, we cannot say definitively whether any of our customers’ information was actually accessed or subsequently compromised. Sears said federal law enforcement authorities, banks and IT security firms are working to investigate the source of the breach.