American Airlines' AAdvantage loyalty program information has been compromised in a data breach that is impacting numerous carriers around the world. 

The names of AAdvantage members, their elite status and their AAdvantage numbers may have been exposed in the incident, though passwords and financial information have not been impacted, the airline said.

"We do not believe this data poses a risk to our loyalty members or their AAdvantage miles," American said in statement. "As a courtesy, we have notified affected AAdvantage members by email. We are continuing to investigate this incident, but American's systems were not compromised as part of this incident."

The airline did not say how many loyalty program accounts were breached. 

The breach occurred at the technology company SITA, whose Horizon Passenger Service System is among the largest IT providers in the global airline industry. 

American does not use SITA's Horizon system. However, the breach has filtered through the Star and Oneworld alliances because airlines within alliances share frequent flyer information so that they can provide reciprocal loyalty privileges. American is a Oneworld member.

Star Alliance member United did not immediately respond to an email Friday evening about whether any of its data has been exposed. 


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