About 5 or 6 years ago I flew to Hawaii. First it was a 4 hour plane flight to California and then a 5 hour trip to Hawaii. Honestly I was so excited that we were going I totally forgot about my Emet. Someone did get sick on that flight, the one to Hawaii, and I remember seeing the flight crew running back and fourth with air sickness bag but I didn't get anything.
I think that as long as you are careful and you keep your hands clean and such then you should be fine. I know the air is circulated in planes so it's probably easy to pick up a virus but most people don't fly when they are sick. I remember this one time when we went on vacation and my sister got a SV and we actually put off flying until she was better.
I wouldn't worry too much about it, like I said...just proper hygene...you'll be fine!
~Monica
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