Abstract: An air vehicle control system (1) and method for operation of one or more air vehicles, AVs, (2) flying along flight routes (FR) assigned to the air vehicles, AVs, (2) by said air control system (1) according to a calculated flight route plan, FRP, within a predefined airspace, wherein an air flight guarding control unit (3) integrated in the air vehicle, AV, (2) is adapted to intervene automatically with flight controls of the air vehicle, AV, (2) on the basis of a monitored flight status of the air vehicle, AV, (2) such that the air vehicle, AV, (2) is kept during a flight movement within three—dimensional confines or boundaries of the assigned flight route (FR) and collisions with other air vehicles, AVs, (2) or with other obstacles are avoided.