To Re-route (RRT) a flight, you need to use the Edit flight function.
Click the X to remove a leg (Optional, if needed).
Change ARR station to where you want to re-route.
Click the REFRESH button then the RECALC TIME button.
The original routing will be replaced with the new.
Display of changes:
Add a SI info, and use the arrow to copy the note as a TTnote while clicking on the arrow downwards.
Click next and a RRT message will be created with the pre-selected distribution list.
After clicking the magnifying glass, an ASM message displays.
The rerouted flight will now be visible on the schedule Gantt.