ISTANBUL, TURKEY - SEPTEMBER 22: Police unit hangs from a helicopter with Turkish flags as they perform within the Teknofest Istanbul Aerospace and Technology Festival in Istanbul, Turkey on September 22, 2019. ( İslam Yakut - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: Turkish Air Force’s aerobatic demonstration team, 'SOLOTURK' perform on the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: Police unit hangs from a helicopter with a Turkish flag as they perform within the Teknofest Istanbul Aerospace and Technology Festival in Istanbul, Turkey on September 22, 2019. ( İslam Yakut - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: Turkish Air Force’s aerobatic demonstration team, 'SOLOTURK' perform on the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: Turkish Air Force’s aerobatic demonstration team, 'SOLOTURK' perform on the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: Turkish Air Force’s aerobatic demonstration team, 'SOLOTURK' perform on the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: People watch T129 ATAK helicopters' demonstration flight within the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: T129 ATAK helicopter perform a demonstration flight within the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: T129 ATAK helicopter perform a demonstration flight within the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: T129 ATAK helicopter perform a demonstration flight within the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: T129 ATAK helicopter perform a demonstration flight within the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL, TURKEY - SEPTEMBER 22: T129 ATAK helicopter perform a demonstration flight within the last day of Turkey’s largest technology and aerospace event TEKNOFEST Istanbul, at Ataturk Airport, Istanbul, Turkey on September 22, 2019 ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL,TURKEY - SEPTEMBER 22: People visit Teknofest Istanbul Aerospace and Technology Festival on the final day of event, in Istanbul, Turkey on September 22, 2019. ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL,TURKEY - SEPTEMBER 22: People visit Teknofest Istanbul Aerospace and Technology Festival on the final day of event, in Istanbul, Turkey on September 22, 2019. ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL,TURKEY - SEPTEMBER 22: People visit Teknofest Istanbul Aerospace and Technology Festival on the final day of event, in Istanbul, Turkey on September 22, 2019. ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL,TURKEY - SEPTEMBER 22: People visit Teknofest Istanbul Aerospace and Technology Festival on the final day of event, in Istanbul, Turkey on September 22, 2019. ( Emrah Yorulmaz - Anadolu Agency )

ISTANBUL,TURKEY - SEPTEMBER 22: People visit Teknofest Istanbul Aerospace and Technology Festival on the final day of event, in Istanbul, Turkey on September 22, 2019. ( Emrah Yorulmaz - Anadolu Agency )