Events

Delegates at the International Radiotelegraphic Convention in Berlin adopted SOS as the universal maritime distress signal on November 3, 1906, effective July 1, 1908. The signal, three dots, three dashes, three dots in Morse code, was chosen purely for its distinctiveness: the pattern is nearly impossible to mistake for anything else through static and interference. 'Save Our Souls' and 'Save Our Ship' are backronyms invented later; the letters themselves don't stand for anything. The previous distress signal, CQD ('Come Quick, Danger'), was harder to distinguish in noisy conditions. When the Titanic struck an iceberg in 1912, its operators sent both CQD and SOS. The Carpathia responded. The incident permanently established SOS in public consciousness. Modern ships use digital distress systems, but SOS remains universally understood.

Pan American Airways' Martin M-130 flying boat China Clipper departed Alameda, California, on November 22, 1935, carrying 110,000 pieces of mail on the first transpacific airmail flight to Manila. The route covered 8,200 miles with stops at Honolulu, Midway, Wake, and Guam, each equipped with hotel facilities that Pan Am had built on otherwise uninhabited islands. Captain Edwin Musick and a crew of seven completed the journey in roughly 60 hours of flight time over six days. No passengers were carried on the inaugural flight; the service was initially mail-only. Passenger service began the following year at $799 one-way (about $17,000 today), limiting it to diplomats, executives, and the wealthy. The China Clipper cut Pacific transit time from three weeks by steamship to less than one week, compressing the world in ways that made Pearl Harbor strategically inevitable.