The
same hackers had targeted insurer Anthem Inc in February and the
U.S. government's personnel office in June, Bloomberg reported
on Friday.
The group had also hacked the systems of another U.S. airline
operator United Continental Holdings Inc in May or early June,
Bloomberg reported last month.
American Airline and Sabre were not immediately available for
comment.
American Airline shares some network infrastructure with Sabre,
a former subsidiary that the U.S. airline operator spun off into
a separate company in 2000.
(Reporting by Ankit Ajmera in Bengaluru; Editing by Kirti Pandey)
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