Asset-heavy container lines have always had an uneasy relationship with asset-light freight forwarders. If they have been the odd couple of the maritime supply chain, the relationship is arguably getting odder.

Two of the three biggest box carriers, AP Moller-Maersk and CMA CGM, are embarked on different paths but with the same aims: to add freight forwarder skills, in order to make more money from moving deepsea containers.