ok. fair enough - i do know that there are some landings on 9R. i guess what i'm wondering is why isn't there a defnite alternation of runways at a definite time - like on 27. that means the houses under neath the flight path of 27R( east of the airport) will always have aircraft at take-off thrust throughout the day! wheras when landings are made on runways 27, at least its only for half a day that they have "relativey" less noise as its a landing aircraft.
I just found it strange thats all.
thanks spanish flea for your post - didn't understand a word of it though
and it didnt really answer the question.