wrote in message
Is the flap angle normally held constant throughout climb? Ditto for
descent.
If not, what are the typical rules or schedule for changing the flap
angle for a large commercial aircraft? Thanks.

The topic can be fairly complicated. Generally speaking, the flaps are
retracted one notch after climbing through somewhere between 800' to 1500'.
The flaps and slats are further retracted as the airplane accelerates.
Climbing with the wing in the 'clean' configuration is most economical.

D.