RIO DE JANIERO 13 AUG 1939. When landing, the seaplane, a Pan American Airway Sikorski, en route from Miami, Florida, USA to Rio de Janeiro, Brazil and Buenos Aires, Argentina, struck a dry dock in Guanabara Bay, Rio De Janeiro, and was demolished. The pilots and 14 of the 16 occupants were killed. Mail for Rio de Janeiro and Sao Paulo received a black one line cachet: ‘ACCIDENTE DE AVIAO’.