Originally Posted by
SecurityTheaterFanClubPresident
In a past life, an employee of mine had a severe peanut allergy (as in, she would die). When I traveled with her she would be afforded early boarding to wipe/clean the seat before sitting down. Obviously they also wouldn't serve peanuts on flights that she was on. She informed Delta of her allergy in the special assistance section that you probably skip right over when you book a ticket (I know I do).
You can also notify them of your nut allergy after you book your ticket. IIRC, there is a special assistance area there as well and that's what I used.