The Learjet 24 was at FL 450, en route to McAllen, Texas, from Casper, Wyo., when the flight crew made initial contact with Albuquerque ARTCC. About one minute later, the controller called with a frequency change instruction but got no response from the crew. At about that same moment, the Lear’s transponder beacon went dark. The controller made several attempts to contact the aircraft but to no avail. The pilots never responded. Meanwhile, people in Felt, Okla., heard what seemed to be ...


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