Aviation festival "SKY: theory and practice" held in Moscow, Russia
People's Daily Online
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An aircraft performs during the aviation festival "SKY: theory and practice" in Moscow, Russia, May 22, 2021. The festival is held annually in Moscow featuring performances by aerobatics teams, vintage airplanes, helicopters and a competition of homemade aircraft. (Photos: Alexander Zemlianichenko Jr/Xinhua)

Airplanes perform during the aviation festival "SKY: theory and practice" in Moscow, Russia, May 22, 2021. The festival is held annually in Moscow featuring performances by aerobatics teams, vintage airplanes, helicopters and a competition of homemade aircraft.

An airplane prepares to take off during the aviation festival "SKY: theory and practice" in Moscow, Russia, May 22, 2021. The festival is held annually in Moscow featuring performances by aerobatics teams, vintage airplanes, helicopters and a competition of homemade aircraft.

An aircraft performs during the aviation festival "SKY: theory and practice" in Moscow, Russia, May 22, 2021. The festival is held annually in Moscow featuring performances by aerobatics teams, vintage airplanes, helicopters and a competition of homemade aircraft.