Jet blue seems to be good about it quite a few times going down or back from Disney they announced that there was someone with a peanut allergy on the plane and they didn't serve peanuts
Also when I was flying home from MCO this past May the Air Tran FA made an announcement just before take off that there was a passenger on board with peanut allergies and would everyone please refrain from eating any peanut products. As far as I know no one did, but the couple next to me did make a comment that they sure wished they had made the announcement before we boarded as they had brought a big can of salted nuts to snack on. If the announcement had been made prior to takeoff, they could have bought some different snacks.
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