Shipping schedules are often notated "subject to change" and as per yesterday's post that is sometimes due to labour issues, but may also be a result of the re-alignment of alliances, or simply more efficienct use of resources.
The latter two may be at the root of recent and future changes in ZIM schedules (ZIM Integrated Shipping Services). Since 2018 ZIM has operated a Canada Feeder Express CFX linking Halifax to New York and Kingston, Jamaica. Feeder ships connect to ZIM's weekly transatlantic service, ZCA, in Halifax. Recently however the CFX service appears to have been merged with the ZCX Colibri Xpress. That line, which started up in early 2023 connects to the west coast of South America from Kingston, Jamaica and extends up the US east coast as far north as Philadelphia.
By extending the Colibri Xpress to New York and Halifax, and eliminating the CFX, ZIM appears to have made more efficient use of ships, and as such sees the return of a familiar ship which was one of the orginal CFX callers in 2018.