China Clipper flight departure site when Sikorsky S-42 "Samoan Clipper" exploded over Samoa in January, 1938. "Hawaii Clipper" disappeared westbound from Guam to Manila in July, 1938. There were unsubstantiated rumors of Japanese involvement, similar to those arising from the disappearance of Amelia Earhart a year earlier. Earhart's navigator, Fred Noonan, had been navigator aboard "China Clipper" during the initial airmail flight. Boeing 314 flying boats "Honolulu Clipper" (NC18601) and "California Clipper" (NC18602) joined the surviving Martin M-130s in 1939, and "Pacific Clipper" (NC18609) and "Anzac Clipper" (NC18611) extended service to New Zealand and Australia in 1941. "Philippine Clipper" returned to Wake when it received
Fred Noonan Earhart reported that they were flying a standard position line (or sun line), a routine procedure for an experienced navigator like Noonan. This line passed within sight of Gardner Island (now called Nikumaroro) in the Phoenix Island Group to the southeast, and there is a range of documented, archaeological, and anecdotal evidence supporting the hypothesis that Earhart and Noonan found Gardner Island, uninhabited at the time, landed the Electra on a flat reef near the wreck of a freighter, and sent sporadic radio messages from there. It has been surmised that Earhart and Noonan might have survived on Nikumaroro for