You mean, for those that like to create work for themselves?
Seriously, it depend on the series aircraft. The "Classics" might climb on a speed, say 290, then crossover to a particular Mach and then reverse the process on decent. Depends on if you want to go fast, build time, save fuel, or follow Co. procedure.
The newer airplanes follow the FMS, usually, with a cost index entered that can cover your speeds. It depends on weight, and the index, then. But the NG's will climb from anywhere around 270-310, crossover to .77-.80 and then reverse the process until ATC screws it all up.
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