At Delta we can have a different CI for climb, cruise, and descent phases. Usually the climb and cruise CI is the same and will typically be between 35 and 60. The descent CI is usually 55 or 60 so we keep the speed up in the descent since most places don't want you doing 250 indicated on the descent. If we go into a place like RAP then I have seen the descent CI down at 35 to save fuel. Our guys tend to adjust the CI numbers alot depending upon what we are up against.