Eight warships joined a US aircraft carrier and scores of helicopters and planes Thursday to search for three American sailors who went missing after their plane crashed in the Philippine Sea.The families of the missing sailors were notified after a C-2A "Greyhound" aircraft with 11 people on board went down Wednesday afternoon around 930 kilometres (500 nautical miles) southeast of Okinawa, the US Navy said in a statement.Eight sailors were rescued shortly after the accident and ta