Take the quiz below to find out how well you know X-planes!
This X-plane was the first aircraft to fly with variable wing sweep.
![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-001.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-002.jpg)
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This is the first aircraft to exceed Mach 3.
![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-003.jpg)
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This is the first manned hypersonic aircraft.
![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-004.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-005.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-006.jpg)
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This is the first aircraft to break the sound barrier in level flight.
![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-007.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-008.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-009.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-010.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-011.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-012.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-013.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-014.jpg)
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![](https://aviationhumor.net/wp-content/uploads/2016/05/How-Well-Do-You-Know-X-Planes-015.jpg)
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