Given the question: The RK-I (Razdvizhnoye Krylo - Istrebitel – extending wing - fighter) (a.k.a. RK-2) was a two-seat cabin aircraft designed and built in the USSR from October 1938. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
The answer is:
Mean Of Transportation