The distance to the alternate is in most flightplans great circle.
Extra fuel jigs into possible earnings.
Every chance is translated into payload.
The ILS at ZRH still is and was CAT 3B.
RVR is in fact only required beeing able to taxi the plane after auto rollout.
The wind was calm on first contact.
RVR was sufficient when available.
There was obviously no fault on the plane.
The only thing missing was an intermittant communication failure of a line on ground.
Technically this was a normal landing like every day (without disturbing steering inputs of a pilot).
A diversion in a scenario of just the required fuel.
Every guy who did a diversion due to airport closure knows about the resulting delays taking the crew almost certain into a fuel emergency.
These airplanes and ground facilities are far more sophisticated than radar vectors and traffic handling, this is for shure.
So the CAPTAIN did the only right thing, he DECIDED the safest way to take the flight to ground.
And he did it rubber first, we only can agree.
