Go to Central America and see what you think about American cops then.

Finding a flight that doesn’t serve peanuts might improve the probability of avoiding an allergic reaction, but a passenger could easily board the flight with their own peanuts. According to OP, the epi pens only give them 20 mins to get to a hospital, which is not within reach when flying over the Pacific Ocean. It might not even be within reach when flying over land considering landing procedures for an airliner.