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Shipper's Letter of Instruction (SLI)
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What is a Shipper's Letter of Instruction (SLI)?
A shipping document, generated by the shipper/exporter, that provides transportation and documentation instructions for a freight forwarder or carrier. It also usually authorizes the forwarder to act on behalf of the shipper and to transmit Electronic Export Information (EEI) to the Automated Export System (AES).
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