Earlier this year, a U.S.-airline revenue flight in oceanic airspace received a clearance via text from a controller—a process that is becoming more common as the industry shifts routine exchanges between pilots and air traffic controllers from voice to data. The flight crew saw the message, accepted the clearance and began to change altitudes.  There was one problem, however: The clearance was intended for a different flight—one operated by the same aircraft hours before. ...


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