talkdownmen,
Thanks for the quick answers. Your response to my first question, very clear.
My native language is not english, I sense your answer to my second question appears to me ( excuse me if I got that wrong and my second question was not meant to critise) a little sarcastic. I understand that before you start the decent you have to clear the outbound traffic, however once you finally start to decent you get the track miles to go, however, they always end up more than initially given. I'm confused because when landing on the 27's they are always accurate, not so when given the track miles to start the final decent when landing on the 09's.
Again, apologies if I misread your answer. Are you in fact saying that track miles given are not always accurate and that atc realizes that a CDA is not always possible?
Thanks