(Translated by https://www.hiragana.jp/)
Boeing 367-80 - Wikimedia Commons

Boeing 367-80

prototype airliner model by Boeing
English: The Boeing 367-80 or "Dash 80", as it was called within Boeing, was a concept demonstrator jet transport. It is usually said to be the prototype for both the KC-135, an air tanker, and the Boeing 707 airliner.