FedEx could cancel contracts for $10 billion in American-made planes if Congress makes it easier for unions to organize the delivery giant's workers.

In a Securities and Exchange Commission filing, the Memphis-based company disclosed that purchases of Boeing 777s are contingent on FedEx Express' continued coverage by the National Railway Labor Act.

The disclosure serves as a warning shot to lawmakers seeking to put FedEx Express workers under the National Labor Relations Act, a move seen as helping the International Brotherhood of Teamsters.

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