A group of China-linked hackers that has mowed through the databanks of major American health insurers and stolen personnel records of U.S. military and intelligence agencies has struck at the heart of the nation’s air-travel system, say people familiar with investigations of the attacks. Sabre Corp., which processes reservations for hundreds of airlines and thousands of hotels, confirmed that its systems were breached recently, while American Airlines Group Inc., the world’s biggest carrier, said it is investigating whether hackers had entered its computers.
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