As an RN, I certainly understand the danger of nut allergies, especially in children; however, this is ridiculous! Kids go plenty of places where there might have been someone eating nuts just prior to their arrival (movie theaters, amusement park rides, bleachers at ballgames, even supermarkets come to mind). One can wipe down their seat and tray tables AFTER arriving at their seats, no need to board early (we wipe down our seats and trays all the time -- airlines are SUPPOSED to do so, but you'd be surprised at what we've found in those pockets in front of us when boarding). Just another rule for people to use phony excuses to board early or bend the guidelines to work for them. Sigh.