Flying drone and method for controlling a flying drone

A flying drone comprising: €¢ a memory for storing a forecasted flying trajectory, said trajectory being defined by a list of 3D coordinates points and comprising a main trajectory and at least one alternative trajectory, said main and alternative trajectories being each defined by a sublist of 3D coordinates points; €¢ a control and command computer for driving drone directional and motorization means, said control and command computer being connected to the memory for reading the forecasted trajectory so that the flying drone is able to move along said forecasted trajectory, said control and command computer being adapted to read said alternative trajectory in the memory so that the flying drone is able to move along said alternative trajectory only if at least one predetermined condition is verified.