London/Singapore, April 12 -- Two Chinese supertankers loaded with crude appeared to be transiting the Strait of Hormuz hours after a Greek vessel moved through the waterway, in what would mark a significant uptick in oil shipping traffic days after a fragile ceasefire between the US and Iran was announced. If all three pass on Saturday - the journey takes eight hours - it would mark the biggest day of oil exits through Hormuz since the war caused traffic through the waterway to all but halt at the start of March. None is carrying oil from Iran or has obvious, direct links to the country. The two Chinese supertankers would be the first from China observed taking barrels out of the region. In oil-flow terms, the exits are significant but sti...