...on the other side of the world...
The United Airlines ALPA leaders sent out a message today to their pilots stating the union's position. For brevity, I have cut out a small section of it:
If you believe that your safety and welfare will be at risk by flying to Narita, you should advise the company (your flight office) of this fact and refuse the assignment. Further, the Association will support, to its fullest extent, any pilot who refuses an assignment to Narita under the current conditions and it is the vehement position of the Association that no pilot be disciplined or penalized for exercising what they believe to be the protection their health.