Santos-Dumont 14-bis
Santos-Dumont tried several times before he truly managed to fly in the 14-bis.  His first attempt in July 1906 did not work.  In September, he managed two short hops.  In October, the 14-bis flew for 50 meters.  That was the first flight that the Aero Club of France ever officially witnessed.  In November, he was able to keep the 14-bis in the air for 220 meters, 6 meters up in the air.