Well i want to be cabin crew but i needed to find this information and it doesn't look as an attractive job, this all stemed from someone saying it in passing and then i read nasa's forecast then searched for this:
http://www.studyworksonline.com/cda/...R1193,00.shtml
Still the Association of Flight Attendants recommends having radiation monitors on flights so that airplanes could change altitude or route during solar storms. And a few airlines do routinely alter routes to avoid solar storms. European governments classify their flight crews as radiation workers, educating them about radiation risks and tracking their exposure. Some people discount the dangers from solar radiation and suggest that the solar flares' disruption of radio communication is a bigger threat to passengers as is their risk from germs carried by other passengers[B]