9. XB-70 Valkyrie 2,000mph Cont’d
![](https://historygarage.com/wp-content/uploads/2016/11/Fastest-Aircraft-post-XB-70-valkyrie.jpg1_.jpg)
Photo: nasa
It was designed for use as a deep penetration strategic bomber that also happened to be armed with a nuclear weapon. Luckily it never was used for its intended purpose but the United States government was whiling to pay a lot of money to be prepared for it if they did.