My husband flew to Santa Ana for business this week. He flew Southwest (aka the peanuttiest airline around - check out their header image - blech).
When they were boarding the stewardess notified the passengers that there was a peanut allergic person on the flight and that they wouldn't be serving peanuts on the flight (and if you wouldn't mind, please do not eat any peanuts you may have brought on board?). Mark was shocked (and appreciative). How cool was that?
I've only flown peanut free airlines with Bella (United, American), and wouldn't fly SWA because of the nuttiness factor (e.g. left on the floor, etc), but things like this may slowly make me come around. Upon further inspection, I found their policy online. Pretty good (I like the tip about flying early in the day). They included all the CYA stuff too about not being able to control what other people bring, blah blah blah, but it's nice to see them addressing it.
With something like 1 in 17 children having some sort of food allergy (just saw that figure somewhere recently - probably on the peanutallergy discussion board), it's smart for them to accomodate travelers (young and old) - it's just good business.