Where possible we attempt to provide CDA's They are compulsory for us at night. You will ALWAYS recieve a Range check PRIOR to the commencement of the final descent with the aim being that you commence your descent from 6000 feet and continue on the glidepath.
I say again that we do not delay you unneccesarily and you will only be given a period of level flight or extra track miles when required.
John Boeman...you use your judgement coupled with what you see on TCAS....please see my previous reply regarding the requirement of the tower. Any non standard R/T is unneccesary chit chat.