SIMIC

New York handled 792,548 TEU, nearly 19 per cent more than in October 2019.

Last week, the Port of Los Angeles posted its lowest level of October since 2009. Port of Los Angeles executive director Gene Seroka cited protracted negotiations and fears of a labour strike among port workers as the reason for the shift in trade at a press conference earlier this week. For the last three months, the Port of LA has also trailed behind the Port of Long Beach.

Logistics managers have been saying for months that trade was being redirected due to the labour issues at West Coast ports and several links in the transportation network, including rails, have begun using new models to route shipments across the country based on changes in port usage.

The labour situation on the West Coast remains uncertain.

While talks between the International Longshore and Warehouse Union and the Pacific Maritime Association are expected to resume soon, the resumption offers little clarity on the progress of negotiations, according to an analysis provided to CNBC by a spokesperson at supply chain research firm Everstream Analytics. It warns that despite beginning talks in May 2022, the two sides seem farther than ever from reaching an agreement.

Despite falling cargo volumes on the West Coast, Everstream says the labour actions at both the ports of Oakland and Seattle have decreased productivity, leading carriers to divert volumes to Canadian ports on the West Coast.

"Two fundamental reasons explain the record-breaking number of boxes being processed by the Port of New York/New Jersey," said Josh Brazil, vice president of supply chain insights for Project44, which is tracking the containers.

"Firstly, shippers are still avoiding the West Coast to mitigate the risk of labour strikes at LA and Long Beach. Secondly, European imports to the East Coast are also very high."

According to Project44 data, total vessel TEU capacity deployed from Europe to the East Coast is up 15.5 per cent compared to October 2021.

Even as the East Coast rises as a port competitor, it is not immune from a slowing global economy and weaker consumer. CNBC Supply Chain Heat Map providers warned in the summer and fall of a decrease in manufacturing orders which has impacted the volume of shipping. The lesser container volumes are now being seen off the ports across the East Coast, including New York and New Jersey.

While the holiday season is just around the corner, Alex Charvalias, MarineTraffic's supply chain in-transit visibility lead, said the New York port is facing a record-low average waiting time for container capacity "off port limits." Its data shows this number dropping since week 42, when it was at 84,694 TEU, to 28,340 TEUs in week 45.