A standard Shipper’s Letter of Instruction provides transportation and documentation instructions to a freight forwarder, but it does not typically include specific line-item level product information that would allow the forwarder to file through the Automated Export System (AES). The National Customs Broker & Forwarders Association of America (NCBFAA) has issued a model SLI that includes the level of detail required to file through AES including the additional data fields required by changes to the Foreign Trade Regulations that went into effect in April 2014.
