What year was the first airplane made?
The Wright Brothers are credited for the first successful powered flight of an airplane in 1903. However, some people believe that Da Vinci may have designed an airplane, or at least the plans for one.
It might be necessary for you to clarify what you mean by "successful." If you are referring to the first successful AIRPLANE FLIGHT, then that would be the one the Wright Brothers made on December 17, 1903 at Kitty Hawk NC. But, if you are referring to the first FINANCIALLY SUCCESSFUL airplane, then I don't have an answer for you, at this time.