high speed climb/descent

[a319320]

Could someone please list all the pros and
cons for high speed climbs/descents.
I need my theory refreshed!!
Thanks in advance!

[Roadtrip]

Econo high speed climbs are more efficient than say L/D max angle climbs. High speed descents allow a steeper gradient. It's all trade-offs -- fuel burn vs. less time in the air. Airlines have their own ideas of how to minimize costs, but even then, sometimes the object is speed and not minimal costs.