Pago Pago International Airport and the original Tafuna Airfield military facilities were first used for commercial trans pacific air service in November 1946 when Pan American Airways resumed service from Honolulu to Australia and New Zealand. Pan American utilized Douglas DC-4s, and eventually upgraded to Douglas DC-7C aircraft in 1956 (when Pago Pago International Airport was upgraded as a commercial airport) for its Honolulu / Canton Island / Pago Pago / Nadi / Auckland and Sydney route. This service was conducted using the outbased DC-7C aircraft Clipper "Seven Seas" N743PA and Clipper "Pacific Trader" N744PA