Descend when ready
I'm just curious about the ATC instruction, "descend when ready to ..........". In some cases, this can be given up to 20 mins before top of descent. Some time later, the crew advise thay are leaving that level for the cleared level.
Wouldnt it help the the contoller for forward planning if the pilot gave a proposed top of descent if its some time off, either as a DME disatance or time.
Does the controller know already when jets will have TOD, turbo props, Lighties etc. Do different airlines have different TOD points for the same type etc.