IMHO the important thing is to make sure that you LOOK as though you are absolutely confident that you are in the right place. A single hesitation, a single furtive look at another line and they will swoop to make sure that you aren't mistakenly steering towards a destiny of which you are undeserving. (and please don't mention the fact that the CSA behind the FC desk is twiddling their thumbs... this has absolutely NO bearing on the matter).