@therealbuscuit
It's the difference between allergy and intolerance.
An intolerance to dairy and wheat means that you will only be affected by it if you ingest it, and if you do, it's likely that you will either throw up or shit your pants as your body tried to get rid of it.
An allergy is different, it's a lot more dangerous, and as was shown on This Morning, it can turn a healthy young woman into nothing more than skin and bone who can't walk, talk, or even close her mouth.
Allergies can produce anything from a spot or rash, to swollen lips, painful limbs, and even death, especially as the allergens from peanuts can become airborne. Put those in a packed plane that recycles air and limited medical supplies ....
There are 13/14 major allergens in food alone. I really hope you never have to deal with one yourself, or watch someone else having an attack because it's horrible.
I love peanuts, but I agree with banning them on planes.