[eye30]

Question:
How do they know it has done its first flight if they can't see it?

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 The UK’s most advanced aircraft - a high-tech drone called Taranis - has made its first flight in stealth mode, which means it’s virtually invisible to radar.

Taranis - named after the Celtic god of thunder - is an unmanned combat air vehicle, or drone.

British drone makes its first invisible flight - BT