A source familiar with the situation said the bomb threat towards Flight AA292, which was traveling from New York to New Delhi, was sent via email.

An American Airlines flight from New York to New Delhi was diverted to Rome on Sunday due to a security concern later determined to be "non-credible," the airline said, adding the flight landed safely in Rome and will depart for Delhi on Monday.

Two Italian military fighter jets flanked American Airlines Flight 292 as it arrived but the Federal Aviation Administration did not elaborate on what was the security issue aboard the plane.