The world's first official airmail flight came the next day, at a large exhibition in the United Provinces of Agra and Oudh, British India. The organizer of the aviation display, Sir Walter Windham, was able to secure permission from the postmaster general in India to operate an airmail service in order to generate publicity for the exhibition and to raise money for charity. Mail from people across the region was gathered in at Holy Trinity Church and the first airmail flight was piloted by Henri Pequet, who flew 6,500 letters a distance of from Allahabad to Naini – the nearest station on the Bombay-Calcutta line to the exhibition. The letters bore an official frank "First Aerial Post, U.P. Exhibition, Allahabad. 1911". The aircraft used was a Humber-Sommer biplane, and it made the journey in thirteen minutes.