we will be over there tomorrow at....
Whoever declares the actions of the future with 100% of certainty is either arrogant or rude.
What about weather changes etc. etc?
Whoever conditions the future actions by "God willing.." etc.
or just gives an "ESTIMATE AT..",
(which by itself means same as God willing),
is honest and 100% right.
Whoever conditions his or her "ESTIMATES" by "God willing..", etc.
actually DECLARES his or her UNCERTAINTY" how to handle the FMS and/or ATC/ Company Flight Plan.
Voila. Hallas.