Oh please, you were not on one of the last flights to serve peanuts. Airlines are still serving them unless they get a prior request not to. Anyone who is that allergic to peanuts would inform the airline when they bought their ticket. I am not personally acquainted with any children who are allergic to peanuts but I do know a 55 year old woman who is.
Well I fly a lot and Southwest is the only airlines I know about that still serves peanuts. Perhaps you know others? Or perhaps there are constant requests not to serve peanuts. Most now pass out pretzels I assume to avoid the whole issue.