You can't do anything about an airborne virus unless you want to wear a mask and even then it's iffy. Everything Big Ben suggested, take disinfected wipes and clean everything. Anything you would touch from seat belt, trays, armrest... Do not touch your face at all, don't rub your eyes, lips. I work in L.E. and we take classes once a year to make sure we are protecting ourselves from contagious diseases. When my wife and I fly we always have wipes. Are we Howard Hughes batsh!t crazy about germs? No but we do clean everything we touch. MRSA is out there. The today show had a segment about how dirty flying is. I'll see if I can find it.