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#OnThisDay in 1934, the first Martin M-130 took its first test flight in Baltimore, Maryland. Designed under chief engineer Lassiter C. Milburn and the largest commercial airplane when delivered in 1935 and 1936, only three Martin M-130 flying boats were built. They were named "Hawaii Clipper", "Philippine Clipper", and "China Clipper". When the "China Clipper" inaugurated service to Asia, the name became synonymous in the public’s mind with all of Pan American’s Pacific flying boats. Its distinguishing characteristics were sleek lines and the stabilizing seawings, or “sponsons,” at the waterline braced by cross struts. #avgeek #aviationhistory Pan American Airways, aircraft construction 1934 SFO Museum Collection Gift of the Captain John B. Russell Family 2012.149.0912 This image was posted on December 30, 2016.