Wright Brothers - They claimed spectacular flights in 1903, 1904 and 1905. However, they refused to be witnessed by credible people or to publish pictures or drawings of their planes till Aug. 8, 1908. After that date they have been seen flying and established many records.
Here's a link to a website that purports to have over 300 Wright brother images,
The Wright Brothers photographs
including dozens from 1903, 1904, and 1905:
1903 Wright Powered Flight Photographs
1904 Wright Powered Flight Photographs
1905 Wright Powered Flight Photographs