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. Willoughby Delta 8 - The Willoughby Delta 8 or Delta F was a small twin-engined aerodynamic test bed for a proposed flying wing airliner - the Delta 9. The Delta 8 flew in the United Kingdom for a few months during 1939 before crashing; there were no developments.
The answer to this question is:
Mean Of Transportation