cargoes

The plural belongs to the countable side of cargo: separate loads or shipments rather than freight as one mass. You can say a ship carried cargo with no plural at all. Once the loads are counted or set against each other, as with machinery on one run and frozen fish on another, cargoes takes over. It applies equally to freight moved by aircraft or truck, not only by ship.

Here the same letters grow from a different singular: cargoe, an obsolete spelling of cargo. On the page nothing tells the two apart, so in older writing cargoes reads exactly like the modern plural and names the same freight. For anything written today, the singular to reach for is cargo; cargoe belongs only in quoting or discussing older spellings.