Abstract: The invention relates to a method for optimizing the fuel consumption of an aircraft during flight. At a given point of the flight, a fuel excess (EXTRA) is determined relative to the statutory loads depending on the flight profile and weather conditions forecast for the rest of the flight. If the excess (EXTRA) is less than a given value (EXTRA-mini), for at least one of the forthcoming flight phases ({circle around (1)}, {circle around (2)}, {circle around (3)}), the speed of the aircraft is adjusted so as to increase the excess (EXTRA).

Abstract: The invention relates to a method for controlling the formation flight of at least two aircraft (1,2). The first aircraft (1) includes means of transmitting its position, its velocity and its flight plan. The flight plan has predictions of altitude, velocity and time for at least one next waypoint (WPT). The second aircraft (2) includes means of receiving the information transmitted by the first aircraft (1). According to the invention, the second aircraft (2) determines its future flight plan as a function of the information received from the first aircraft (1) in order to maintain a constant separation (T) from the first aircraft (1).

Abstract: The invention relates to a method for optimizing the fuel consumption of an aircraft during flight. At a given point of the flight, a fuel excess (EXTRA) is determined relative to the statutory loads depending on the flight profile and weather conditions forecast for the rest of the flight. If the excess (EXTRA) is less than a given value (EXTRA-mini), for at least one of the forthcoming flight phases ({circle around (1)}, {circle around (2)}, {circle around (3)}), the speed of the aircraft is adjusted so as to increase the excess (EXTRA).