Please answer the following question: The P.B.31E Nighthawk the first project of the Pemberton-Billing operation after it became Supermarine Aviation Works Ltd. was a prototype anti-Zeppelin fighter with a crew of three to five and an intended endurance of 918 hours. It was first flown in February 1917 with Clifford Prodger at the controls. 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?
Answer:
Mean Of Transportation