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Northrop Grumman reveals B-21 test aircraft as stealth programme roars toward first flight | News | Flight Global
![North American NA-239 (left) & Boeing Model 724-13 (right). Two similar supersonic jet-powered nuclear bomber concepts that competed in the WS-110 program. After several redesigns, a winner was chosen and the XB-70 North American NA-239 (left) & Boeing Model 724-13 (right). Two similar supersonic jet-powered nuclear bomber concepts that competed in the WS-110 program. After several redesigns, a winner was chosen and the XB-70](https://i.redd.it/mn1cq9kfmt231.jpg)
North American NA-239 (left) & Boeing Model 724-13 (right). Two similar supersonic jet-powered nuclear bomber concepts that competed in the WS-110 program. After several redesigns, a winner was chosen and the XB-70
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