Aircraft perform during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

Aircraft perform during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

An aircraft performs during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

An aircraft performs during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

An aircraft performs during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

Aircraft perform during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

Aircraft perform during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

An aircraft performs during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

Aircraft perform during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)

A helicopter performs during the Sivrihisar Airshow 2019 in Sivrihisar district of Eskisehir in Turkey, on Sept. 14, 2019. The Sivrihisar Airshow, which is organized annually by Sivrihisar Sportive Aviation Society, kicked off here on Saturday. (Photo: Mustafa Kaya/Xinhua)