Meet the Raider: US Air Force releases first details of top secret B-21 that could take to the air in 2020 - and a pilot will be optional
- All-black plane has a distinctive, zigzagging shape to evade radar
- It will replace the antique B-52s first developed during the Cold War
- Air Force wants to buy 100 of the warplanes, each costing $564 million
- Military said it plans to start testing the plane sometime in mid-2020s
Read more: Meet the Raider: Air Force releases first details of top secret B-21
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