The Kawanishi H8K "Emily" is widely considered to be the best flying boat bomber of the Second World War. It had astounding range, and, unlike most Japanese aircraft of the time, good armor and self sealing fuel tanks. Say in 1941 the Japanese get Oahu and its facilities. There's a version of the Doolittle raid against Hawaii. (They take off from the carriers, bomb, ditch in the Pacific and are rescued by destroyers) As retaliation, the Japanese send three to five Emily's against Seattle or San Francisco or Los Angeles or San Diego. How much damage could they do, and what would the US reaction and response be? Thanks!