System for establishing an operational flight plan and related process

An aircraft operational flight plan establishing system, comprising:

• a basic flight data acquisition unit configured to acquire basic flight data from an external flight plan development system, the basic flight data comprising at least one theoretical fuel weight to be loaded into an aircraft;
• an aircraft actual operational specifications acquisition unit configured to acquire actual operational specifications of the aircraft intended to perform the flight according to an operational flight plan, the actual operational specifications including an airplane context;
• a proposed flight data calculating unit configured to calculate proposed flight data including at least one proposed weight of fuel corresponding to the at least one theoretical weight, the proposed flight data being calculated based on actual operational specifications of the aircraft and on at least one specified trajectory of the aircraft;
• a viewer, and a display manager on the viewer, configured to display, on the viewer, a proposed flight data display window including at least the proposed weight of fuel.