And here's another clue: Looking for the name of a warbird.
1. Never used in the role for which it was designed because the service it was designed for chose a less-expensive and perhaps better aircraft.
2. But a few were ordered for a different use.
3. Four engines.
4. Not many built: something in the neighborhood of 20. But it served for approximately ten years.
5. Armed with cannons and machine guns, and could carry bombs. Whether it ever did carry bombs I don't know.
6. A couple of them were shot down.
7. On some of its missions it sent deceptive radio messages intended to make some of those listening think it was a different type of airplane. The airplane it was impersonating was the one it had lost out to years before (see Clue 1).
8. It was never a civil airplane; all of them were scrapped when the one service that flew them came up with a replacement.