What must an export carrier transmit to CBP before departure for a foreign destination?

An export carrier is required to transmit customs manifest details to Customs and Border Protection (CBP) before departing for a foreign destination. This requirement is essential because the customs manifest contains critical information about the shipment, including details such as the nature of the goods, the quantity, weight, and the consignee's information. This data is vital for CBP to assess risks, enforce export regulations, and ensure that shipments comply with relevant laws and policies.

While complete shipment contents, broker details, and port clearance information are also important in the export process, they are not the specific transmission requirement established by CBP prior to departure. The customs manifest serves as the primary document that encapsulates essential shipment details for regulatory purposes, making it the key requirement in this scenario.