You are right about NRT having lots of masks. My wife will be there on Wednesday morning on the start of a status run (AUS-DFW-NRT-SIN-NRT-ORD-YYZ-LGA-ORD-FRA-ORD-AUS).

It will be interesting to see if there is any significant mask use. When she is online in Singapore I will post an update. We lived in Taipei before, during and after the SARS outbreak, so she should have a reasonable frame of reference.