Given the question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Boeing XF6B -  The Boeing XF6B-1 / XBFB-1 was Boeing's last biplane design for the United States Navy. Only the one prototype Model 236 was ever built; although first flying in early 1933 it rammed into a crash barrier in 1936 and the design was not pursued further.
The answer is:
Mean Of Transportation