I Am Experiencing Severe Neutropenia Caused By Many Years Of

I am experiencing severe neutropenia caused by many years of ongoing chemo. It is becoming a chronic problem and the shots that stimulate growth only bring my neutrophils up for a day or two (long enough for a treatment) before they crash again. I have been cautioned not fly but am wondering if a mask and some prophylactic antibiotics would make flying ok. I can ask my onc on Monday, but thought I would get another opinion as well.