Just to be on the safe side, we don't even take anything on board a plane that has peanuts. Just in case someone has an allergy, we don't have to worry about it. As a diabetic myself, I saw a PP said her mother needed her peanut butter crackers on the plane since she's diabetic. She doesn't "need" peanut butter crackers. There is a multitude of other options she can have in her purse. I usually take cheese crackers, and walnuts/almonds, some type of breakfast bar, etc. But I agree with others that if my child had such a severe peanut allergy, we would drive to our destination where we could be more in control of what the child comes in contact with. I can't even imagine having a child with such a severe allergy to peanuts though, it must be very, very difficult to deal with. I also can't imagine just shrugging my shoulders and eating something on a plane with peanuts in it, even though the passengers had been asked not to.