Aircraft perform during the Sivrihisar Airshow 2021 in Sivrihisar district of Eskisehir in Turkey, on Sept. 12, 2021. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Sunday. (Photos: Mustafa Kaya/Xinhua)

An aircraft performs during the Sivrihisar Airshow 2021 in Sivrihisar district of Eskisehir in Turkey, on Sept. 12, 2021. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Sunday.

Aircraft perform during the Sivrihisar Airshow 2021 in Sivrihisar district of Eskisehir in Turkey, on Sept. 12, 2021. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Sunday.

Aircraft perform during the Sivrihisar Airshow 2021 in Sivrihisar district of Eskisehir in Turkey, on Sept. 12, 2021. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Sunday.

A helicopter performs during the Sivrihisar Airshow 2021 in Sivrihisar district of Eskisehir in Turkey, on Sept. 12, 2021. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Sunday.

Aircraft perform during the Sivrihisar Airshow 2021 in Sivrihisar district of Eskisehir in Turkey, on Sept. 12, 2021. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Sunday.

Aircraft perform during the Sivrihisar Airshow 2021 in Sivrihisar district of Eskisehir in Turkey, on Sept. 12, 2021. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Sunday.