johnhh - 10:40 pm on May 17, 2013 (gmt 0)
Coming from an aviation background. There is no real danger. All the electronics is shielded. Solar flares could be more of a problem. Northern lights are not , I speak from experience.
It's a bit like don't use your phone at gas stations or in hospitals. Just folklore.
PS I hate Luton and Stanstead !