Earth and Sky Adventures(1975)

Original title: Земные и небесные приключения

Galya Chekhon comes to the disappointing conclusion that the class has split, and on the eve of the last summer vacation, she attempts to create a friendly team. Enthusiastic about their dream of flying, the friends arrive at an abandoned glider airfield and decide to assemble a training glider without adult assistance in order to take to the skies...