Now previously I said the french law is no different that other types of dress code laws and in so far as purely legal matters go its not imho until its targeted on a specific type of dressage as is the case with the burka ban.
Which in light of the overall situation to me still apears to be state sponsored bigotry plain and simple.
It makes no sence to make such a law when they allready have plenty of sufficient identity verification that works just fine for women wearing burkas or anything else that would conseal ones identity at first glance at every majior municiple airport in the world where no one has felt the need to ban anything persay conserning this type of thing.