Sabre confirmed that its systems were breached recently, while American Airlines said it is investigating whether hackers had entered its computers.

The previously unreported breach adds airlines to a growing list of strategic U.S. industries and institutions that have been compromised.

Some investigators suspect the attacks were part of a sweeping campaign to create a database on Americans that could be used to obtain commercial and government secrets.

It's a seller's market for the cyber war's special forces.

The hackers who infiltrated Anthem made off with one of the most prized possessions in computer crime: the Social Security numbers of as many as 80 million customers of the nations second-biggest health insurer.

Investigators of Anthem Inc.s data breach are pursuing evidence that points to Chinese state-sponsored hackers who are stealing personal information from health-care companies for purposes other than pure profit.

Sony was warned a year ago that hackers had infiltrated its network and were stealing gigabytes of data several times a week.

As cyber expands, so do the breaches.