恶意飞行员正成为日益严重的安全威胁——却无人知道如何阻止

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A foundational principle in commercial aviation is that the pilots should have the ultimate authority over an airplane’s operation.

But remote-landing systems never became a reality on passenger planes. One concern: the systems risked being hacked.

— The Wall Street Journal · Andrew Tangel

先是防驾驶舱外的坏人，再是防驾驶舱内。这是现实生活中的拜占庭将军问题！