The move comes after Spain turned away three US-flagged ships and a Danish multipurpose vessel on the grounds they were carrying military cargo bound for Israel.
CEO Mark Rourke said a spot rate surge in December was the first sign of truckload capacity exits having a material impact on prices that will eventually lead to the carrier being able to charge shippers higher rates.
A surge in tariff-driven frontloading from Asia to North America earlier in the year led to a wait-and-see approach from US importers, resulting in weaker demand.