Comment by sowbug

Doesn't 91.3(a) already give the PIC absolute authority to act regardless of whether there's a threat? Why invoke the FBI?

> Turning the plane around and landing is certainly in the realm of "reasonable".

Agreed. But doing it without the FBI threat would also be in the realm of reasonable. Which, it could be argued, means that making the FBI threat was unreasonable, or at least very close to it.

Beyond a certain point, even a PIC can cry wolf.