The Transpacific Stabilisation Agreement (TSA) group of container lines is trying for another big rise in rates from Asia to the US.
It said its 15 members should add at least $600 per 40-foot container (feu) from 1 August, lifting numbers over $4,000 per box.
Companies like Maersk Line, MSC, CMA CGM, Cosco and Hanjin Shipping are enjoying sustained cargo demand in the third quarter, it added.