Amazon.com Inc's China arm has registered as an ocean freight forwarder, according to the U.S. Federal Maritime Commission, a move that will give it more control over shipping products from Chinese factories to U.S. shoppers.      Amazon, new freight forwarder     Its new status as a freight forwarder, or “ non-vessel operating common carrier ,” gives Amazon, the world’s largest online retailer, a foothold in the $350 billion a year ocean freight business. It will not operate ships but subcontract that work.   Amazon  is already negotiating a deal to  lease 20 jets to start an air-delivery service  in the United States. The retailer  bought truck trailers to add shipping capacity  and started a program last year that uses a  f leet of on-demand drivers to deliver packages .           More than 10.000 parcels in a single container   More than 10,000 parcels can fit in a single container, so the price for the ocean freight leg could be as low as $0.135 ...