[Svartalfiar]

The Early Bird: northrop-yb-49

You're not even close to going back far enough:

https://www.bbc.com/future/article/20160201-the-wwii-flying-wing-decades-ahead-of-its-time

[DAC21]

1942

https://www.google.com/search?q=Northrop+N-9M&oq=Northrop+N-9M&gs_lcrp=EgZjaHJvbWUyDggAEEUYJxg5GIAEGIoFMgkIARAAGAoYgAQyCQgCEAAYChiABDIICAMQABgWGB4yCAgEEAAYFhgeMggIBRAAGBYYHjIHCAYQABjvBTIHCAcQABjvBTIHCAgQABjvBTIHCAkQIRiPAjIHCAoQIRiPAtIBCTM0MTc4ajBqN6gCFLACAfEF9T8U5wDJwQ0&client=ms-android-samsung-
rvo1&sourceid=chrome-mobile&ie=UTF-8

It crashed and the pilot died about 10-12 years back three miles from me in Ontario CA. It was based at the Chino Airport which is a mile from me.