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In 1921, to facilitate domestic airmail delivery of mail originating overseas, the air transport company SCADTA issued postage In 1921, to facilitate domestic airmail delivery of mail originating overseas, the air transport company SCADTA issued postage stamps for the final airmail delivery of letters to the huge interior lands of Colombia. Scadta agents and the Colombian consulates in the foreign countries calculated the rates involved and sold Scadta postage stamps.The stamps served as additional postage for the final delivery of airmail within Colombia. The Scadta stamps were placed to the right of the normal postage stamps from the originating country.To avoid speculation and exchange of stamps between countries, due to currency rate fluctuation, the stamps were handstamped or, beginning in 1923, machine overprinted with a Spanish abbreviation of the local
