The plane crawls high above the Mekong delta - flooded paddy, intestinal loops of river, roads crammed with Honda 50s and lined with shops selling rice and Marlboros. Then suddenly there is sea, muddy at first, then a cheerful turquoise. The propellers change pitch. The nose drops. A green mountain flicks soon after wing, then a white beach. We bank steeply, lining track of a runway on which two p