1930 Europe - Pan-Am flight USA acceptance envelope to Washington, franked $2.60 Zeppelin, cancelled New York, bears red 'Sugar Loaf' & map (Type I) flight cachets. Friedrichshafen transit on reverse. (Image)

1930 Europe - Pan-Am flight USA acceptance envelope New York - Pittsburg, franked $2.60 Zeppelin, bears red 'Sugar Loaf' & violet Type I 'map' flight cachets. Reverse - green Friedrichshafen transit. (Image)

1930 South America flight illustrated envelope to USA, franked overprinted 2rm Zeppelin for Seville & 4rm for Pernambuco respectively, both bear 'Sugar Loaf' flight cachets & both b/stamped appropriately. (2) (Image)

1934 third South America return flight Argentine acceptance standard & reg envelopes to Hamburg, franked various airmails to 54c tied Buenos Aires, different Friedrichshafen arrival on reverse. 1932 fifth South America return flight Argentine acceptance registered envelope to Holland, franked Zeppelin Surcharge set tied Buenos Aires. Friedrichshafen arrival on reverse. (Image)