Transshipment

Transshipment is the transfer of a container or cargo from one ship to another at a hub port between origin and destination. A smaller feeder vessel brings the container from a port that the main ocean services do not call, it is discharged at the hub, stored in the terminal and loaded onto a mainline vessel for the long leg, or the other way round at destination. The shipper still has one booking and one bill of lading from the port of loading to the port of discharge.

Where it happens on Asia to US lanes

Many Asian ports have direct transpacific services; others rely on relays. On Airlift's lanes, containers from Vietnam and Bangladesh may transship through Singapore, Port Klang or Colombo depending on the carrier's routing, and a container gated in at Laem Chabang can be relayed to a hub before it joins a transpacific ship. The lane pages for Vietnam to USA and India to USA give port-to-port ranges with the transshipment legs included, and Airlift Sealanes shows which services call at which ports.

What it means for transit time and delays

• Longer transit time: the connection at the hub adds days, even when the hub stop itself is short
• Missed connections: if the feeder is late or the hub is congested, the container can be rolled to a later mainline vessel, pushing the US arrival back
• More handling: every extra lift and stay in a terminal adds exposure to damage and loss, which cargo insurers weigh in the risk
• Tracking: the container shows a discharge and a reload at the hub, often under a new vessel and voyage; track the container number, not the first vessel

Customs: the origin does not change

For US customs, the country of origin is the country of manufacture, production or growth (19 CFR 134.1(b)). Passing through a hub port, or being unloaded and reloaded there, does not change it; only a substantial transformation in another country can. Routing goods through a third country to disguise their origin and avoid antidumping or countervailing duties is evasion, which interested parties can report to CBP under the Enforce and Protect Act (EAPA). The ISF for US-bound ocean cargo is still due 24 hours before the cargo is laden on the vessel at the foreign port (19 CFR 149.2(b)).

Transshipment in air freight

Air cargo transships too: shipments are transferred between flights at a hub airport when there is no direct flight, and each hub connection adds time and a chance of missing the onward flight. Sea-air routings combine the two, moving cargo by ocean to a hub and flying it on from there.

Your Airlift quote names the routing, direct or through a hub, so you can weigh a lower rate against the extra days. FCL ocean freight, LCL and air freight quotes all show it, and container tracking follows the box through the hub.