An American Airlines mechanic is facing a federal charge after the navigation system on a jet with 150 people on board, bound from Miami to the Bahamas, was found to have been tampered with.

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Abdul-Majeed Marouf Ahmed Alani, 60, admitted during an interview Thursday that he tampered with a navigation system on a plane before a July 17 flight, according to a criminal complaint affidavit filed in federal court in Miami, The Associated Press reported.