The world's first official airmail flight took place in 1911. Where?
The world's first official airmail flight was on February 18, 1911 in the United Provinces of Agra and Oudh, British India.
The world's first scheduled airmail post service took place on September 9, 1911 between Hendon and Windsor (UK).
The first official experiment at flying Air Mail to be made under the aegis of the US Post Office Department took place on September 23, 1911.