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The recent crash of a cargo plane in Miami operated by 21 Air, a carrier that flies for Amazon, has raised concerns about the airline's safety culture. Former pilots reportedly had been sounding alarms about the operator even before the accident occurred, in which the jet overshot a runway at Miami International Airport and struck several vehicles. In the wake of the crash, Amazon announced it is pausing its work with 21 Air pending further review, a move that underscores the mounting scrutiny of the cargo carrier's operations and safety record.