The plane has been missing for over five days since contact with it was lost early on Saturday. It was flying over the Ho Chi Minh air traffic control area in Vietnam and carrying 227 passengers, including 154 Chinese.The international search for the missing plane, which has so far involved at least 40 ships and nearly 40 aircraft from 12 countries, entered its sixth day today, but the whereabouts of the Boeing 777-200 remain unknown. China has employed 10 satellites to provide technological support in attempts to locate the aircraft, which was expected to land in Beijing at 6:30 am local time on Saturday.