The aircraft called ground control when he was done with his runup and
said he was ready for the clearance. GC read him the clearance and then
gave the strip to the data man for the release. Every clearance was as
filed. Always. There's nothing to digest if you flight planned properly.

If the clearance was not as filed, the pilot may need to revise a
number of avionics settings, e.g. change waypoints if /G. Flying
around Chicago, I seldom get "as filed" even when I try filing the
route they gave me last time.