Make no mistake about it

Even pilots sometimes make mistakes.

Flight Solver keeps track of every change to a flight plan. This allows each change to be undone or re-done. So accidentally deleting a few waypoints or insering the wrong routing does not require a restart from scratch.

Undo smart actions

In response to a user's action, Flight Solver will sometimes do some extra smart actions.

For example:
You might changing a waypoint that is a navaid to a landing point.

In response to this Flight Solver will then also insert the aerodrome at the end of the first sector and at the start of the next sector.

The undo allows you to undo Flight Solvers smart action without undoing your own action.