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You don't want to wait and see if something else happens on the 11th. You also want to maximize your advantage while minimizing damage on our own turf in case of terrorist retaliation. If you do it in the afternoon on Sat., you get all night to run sorties with a sliver of moon. It's not as good as waiting until the new moon on the 7th, but you have the benefit of doing it during the labor day holiday weekend, when major businesses and offices in the major metro areas will be minimally populated. By doing it Saturday afternoon, you also give people who are travelling enough time to get to where they are going. It's seems like the best time all around to me, but they may wait until the new moon and the following weekend.