(210720) — MOSCOW, July 20, 2021 (Xinhua) — A MC-21 single-aisle airliner flies during the opening day of the International Aviation and Space Salon (MAKS)-2021 in a Moscow suburb, Russia, on July 20, 2021. MAKS-2021 kicked off in a Moscow suburb on Tuesday. (Xinhua/Evgeny Sinitsyn)