An American Airlines pilot died after falling ill during a flight from Phoenix to Boston. CNNs Les Abend details the protocols followed by the co-pilot to safely land .\r
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Passengers aboard the Boston-bound flight out of Phoenix say the plane unexpectedly began to descend — making an emergency landing in Syracuse.\r
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Flight with 147 passengers from Phoenix to Boston was diverted to Syracuse. Tune into World News Tonight with David Muir weeknights at 6:30 | 5:30c on ABC .\r
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The first officer of American Airlines Flight 550 declared a medical emergency after the captain became incapacitated - listen to the full ATC recording here.