A Hanjin Shipping Co ship is seen stranded outside the Port of Long Beach, California, September 8, 2016. Lucy Nicholson/Reuters Amazon doesn't want to have to rely on (and pay) third-party delivery companies. It's already taken control of lorries and planes and now it's taking control of ships, The Wall Street Journal reports.

Specifically, the Seattle-headquartered ecommerce giant has started handling the shipment of goods from Chinese retailers that sell on its platform to its vast US warehouses. Previously it left this to global freight-transportation companies.

Since October, Amazon has helped to ship some 150 containers of goods from China to the US, according to The Wall Street Journal, which cites shipping documents collected at ports of entry.

Shipping is a trillion dollar industry, according to MIT Technology Review. While Amazon doesn't actually own any ships itself, it has started reserving space on ocean vessels and acting as a global freight operator and logistics organiser. Other freight operators include FedEx and UPS.

Zvi Schreiber, CEO and founder of logistics platform Freightos, said in a statement: "Logistics companies have been eyeing Amazon suspiciously for years. Yesterday, their fears were confirmed, with the revelation that Amazon has been quietly arranging China to US ocean shipments.

"Amazon's deep pockets means the trillion-dollar freight industry is now coming up against the very same disruptors that changed the name of the game for retailers, manufacturers and computer storage."

Last August, Amazon unveiled its first branded cargo plane, one of 40 jetliners that will make up the company's own air-transportation network. Amazon also has its own fleet of branded delivery trucks and it is testing delivery drones in a field just outside Cambridge.

Amazon shipped over a billion items over the 2016 holiday season alone, according to CNET.

Amazon did not immediately respond to Business Insider's request for comment.