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 Guard cutter USCGC "Itasca". Through a combined sequence of misunderstandings or mishaps (that are still controversial), over scattered clouds, the final approach to Howland Island failed, although Earhart stated by radio that they believed they were in the immediate vicinity of Howland. The strength of the transmissions received indicated that Earhart and Noonan were indeed in the vicinity of Howland island, but could not find it and after numerous more attempts it appeared that the connection had dropped. The last transmission received from Earhart indicated she and Noonan were flying along a line of position (taken from a "sun line"