Col. Henry S Olcott
Col. Henry S Olcott (1832 1907) American author, attorney, philosopher, and cofounder of the Theosophical Society in a lecture in Allahabad, in 1881.
The ancient Hindus could navigate the air, and not only navigate it, but fight battles in it like so many war-eagles combating for the domination of the clouds.
To be so perfect in aeronautics, they must have known all the arts and sciences related to the science, including the strata and currents of the atmosphere, the relative temperature, humidity, density and specific gravity of the various gases...
(source: Chapter on Vimanas).

|