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 running on 157–337 degrees) which Noonan would have calculated and drawn on a chart as passing through Howland. Two-way radio contact was never established, and the aviators and their aircraft disappeared somewhere over the Central Pacific Ocean. Despite an unprecedented, extensive search by the U.S. Navy—including the use of search aircraft from an aircraft carrier—and the U.S. Coast Guard, no traces of them or their Electra were ever found. Later research showed that Howland's position was misplaced on their chart by approximately five nautical miles. There is also some motion picture evidence to suggest that a belly antenna on their