Despite the significant increase in commercial intelligence products from satellite imagery, ripoffs etc, the information available is still quite limited. And the MILP problems that result are extremely challenging to solve. A lot of the shipping companies still seem to use heuristics instead of models.

But shipping lines seem able to control capacity because of consolidation, and hence maintain high utilisation:

https://www.freightwaves.com/news/qa-flexport-on-2021-contai...