My youngest daughter has medical problems and a very low immune system. We have to fly to a funeral this month, and I am afraid she will get sick on the plane (she is very susceptible to illnesses). Does anyone know of a way I can keep her healthy on the flight? I was going to have her wear a mask, but she is a toddler and that won't go over very well as she will just take it off. I was going to try a plane air filter http://www.familytravelgear.com/page/FTG/PROD/PCA-Filter but I don't know if that will be enough. This is tough so I look forward to your help!