There were some comments about the risks of airplanes in a
Flying thread here in 2006. (No, I don't remember every thread at Marrowforums. I used the Search page!)
Each year, people at risk of infection and coming from far away may want to wear a mask on an airplane. People within driving range may consider that to be safer than flying. And those at highest risk may decide not to attend. It's a practical question for each patient with low neutrophils and worth asking the doctor about.