SOME Airtrafficers need to learn a little bit about aerodynamics w.r.t flap!
Totally agree petitfromage but since 9/11 it's not exactly been easy to arrange fam trips for airtrafficers in order to understand 'aerodynamics' etc.
I know that most aircrew have no problem allowing ATC to take fam trips with them but unfortunately, all too often, we get knocked back by some 'Bod' in an office who does not understand how important these trips are!!!