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Is there a difference between OCS and DHL

OCS is a special line for Japan, which can be sent to several major cities in Japan 1 day in case of flight rush in first-tier cities, but it cannot cover the whole of Japan, and it is an agent for second-tier cities, so the speed is not good. DHL can be delivered to Japan in 1 day, but it won't catch the flight for 2 days. DHL has three direct routes in Japan, OCS specializes in Japan, and the price is cheap. DHL is in Japan.