A quick release system for a coupling and drogue assembly of a hose and drogue system for in-flight refueling, comprising: - a coupling connector suitable for being fixed to the coupling, the coupling connector having a circular crown configuration with outer and inner surfaces, wherein the coupling connector comprises: - a plurality of passing-through cavities arranged in radial positions around the crown, wherein each cavity has accesses from both surfaces (17, 18), - a plurality of metallic balls housed in the cavities and radially movable therein, each ball having a diameter smaller or at least equal than the outer surface access and larger than the inner surface access, so that each ball can have a partially emerging part through the inner surface access, - a drogue connector suitable for being fixed to the drogue and configured to engage and disengage with the coupling connector, the drogue connector having a circular crown configuration and comprising: - a parametric wall configured to engage with the inner surface of the coupling connector, said parametric wall having a plurality of first recesses around the crown in correspondence with the cavities positions, - a locking ring having a circular crown configuration having a contacting surface, wherein the locking ring is mounted on the outer surface of the coupling connector and being rotatable between a locked position and a released position, the locking ring comprising: - a plurality of second recesses around the contacting surface of the crown in correspondence positions with the first recesses, the second recesses configured to receive a part of the balls when they are radially moved, wherein the second recesses are arranged in correspondence with the first recesses when the system is in a released position, such as the system is disengaged, and, wherein the contacting surface of the locking ring is in contact with the balls, and the first recesses are engaged with the emerging part of the balls when the system is in a locked position, such as the system is engaged. - a coupling connector suitable for being fixed to the coupling, the coupling connector having a circular crown configuration with outer and inner surfaces, wherein the coupling connector comprises: - a plurality of passing-through cavities arranged in radial positions around the crown, wherein each cavity has accesses from both surfaces (17, 18), - a plurality of passing-through cavities arranged in radial positions around the crown, wherein each cavity has accesses from both surfaces (17, 18), - a plurality of metallic balls housed in the cavities and radially movable therein, each ball having a diameter smaller or at least equal than the outer surface access and larger than the inner surface access, so that each ball can have a partially emerging part through the inner surface access, - a drogue connector suitable for being fixed to the drogue and configured to engage and disengage with the coupling connector, the drogue connector having a circular crown configuration and comprising: - a parametric wall configured to engage with the inner surface of the coupling connector, said parametric wall having a plurality of first recesses around the crown in correspondence with the cavities positions, - a parametric wall configured to engage with the inner surface of the coupling connector, said parametric wall having a plurality of first recesses around the crown in correspondence with the cavities positions, - a locking ring having a circular crown configuration having a contacting surface, wherein the locking ring is mounted on the outer surface of the coupling connector and being rotatable between a locked position and a released position, the locking ring comprising: - a plurality of second recesses around the contacting surface of the crown in correspondence positions with the first recesses, the second recesses configured to receive a part of the balls when they are radially moved, - a plurality of second recesses around the contacting surface of the crown in correspondence positions with the first recesses, the second recesses configured to receive a part of the balls when they are radially moved,