The Ocean Alliance of boxship lines has extended its cooperation until 2027.
The self-styled largest operational agreement between shipping companies was formed in 2017 for a five-year period, with a five-year option to prolong this.
CMA CGM, Cosco, OOCL and Evergreen said the confirmation of the 10-year period only two years after launching "reflects the trust and high-quality working relationship established between the partners.
On Wednesday, the grouping announced its new network for 2019, which involves 330 ships of 3.8m teu.
CMA CGM will deploy 111 of these, with the others coming from Cosco, OOCL and Evergreen.
Called Ocean Alliance Day 3, the network will launch in April with 38 services.
