A flight plan for a tactical flight of an aircraft is generated using
first input data including initial weight and initial loading of the
aircraft, meteorological data, points of transit of the flight plan and
at least one optimization criterion. With the aid of the input data and
by implementing a prediction function and an optimization function, a
flight profile of the flight plan is determined. The profile includes for
each point of transit of the flight plan, a plurality of predictive
information items and, between two successive points of transit of the
flight plan, optimized parameters. The flight plan is presented on a
display screen. A second input allows an operator to enter, for each
tactical event of the tactical flight, a variation of at least one
parameter which is modified by this tactical event at a particular point
of variation of the flight plan. The flight profile is determined using
each parameter variation which is taken into account at the corresponding
point of variation.