At 8:59 a.m. on September 11, 2001, Brian Sweeney dialed his home number from the back of a hijacked airplane. He was 38 years old, a former U.S. Navy F-14 pilot and flight instructor who had served during the Gulf War. By that morning, he'd traded fighter jets for a defense contractor job, and he and his wife Julie had been married for two years, living quietly on Cape Cod.

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