A very good friend of mine has a daughter that has nut issues, but carries on a plane what she needs for meds.
I understand that those that dont have this problem, may or may not know the extent of what harm can happen
so here is a simple solution for airlines
Remember the times, when you had smoking and non smoking areas on planes (ok so I am old)
Maybe they should introduce allergies zones on the plane, with sealed doors for that section of the plane
(ok just kidding)