sentences:  Much of the practical work is done at the summer meetings of the "Idaflieg" in co-operation with the "German Aerospace Center (DLR)", while the results of the research are presented at the winter meetings.The "Idaflieg" also offers many events and courses to its members such as the specification, design and certification of aeroplanes.The quality of additional education provided by the Akafliegs is widely respected and so German glider manufacturers recruit almost exclusively from the Akafliegs.