Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40)

Passenger plane Czech Air Force Jak-40 (YAK-40) identified with the NATO code CODLING near the 24th Air Transportation Base at Prague-Kbely, Czech Republic, August 13, 2020. (CTK Photo/Jan Kouba)

Krzysztof Penderecki

Krzysztof Penderecki

***FILE PHOTO*** Krzysztof Penderecki, Polish composer and conductor, is seen in 1982, in Prague, Czechoslovakia. (CTK Photo/Karel Kouba)

Krzysztof Penderecki

Krzysztof Penderecki

***FILE PHOTO*** Krzysztof Penderecki, Polish composer and conductor, is seen in 1982, in Prague, Czechoslovakia. (CTK Photo/Karel Kouba)

Krzysztof Penderecki

Krzysztof Penderecki

***FILE PHOTO*** Krzysztof Penderecki, Polish composer and conductor, is seen in 1982, in Prague, Czechoslovakia. (CTK Photo/Karel Kouba)

Krzysztof Penderecki

Krzysztof Penderecki

***FILE PHOTO*** Krzysztof Penderecki, Polish composer and conductor, is seen in 1982, in Prague, Czechoslovakia. (CTK Photo/Karel Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

The Aero L-39NG (Next Generation) trainer aircraft

The Aero L-39NG (Next Generation) trainer aircraft

Czech Aero L-39NG (Next Generation), a turbofan-powered military trainer aircraft during the training flights near Air Force Base at Caslav, Czech Republic, October 7, 2019. (CTK Photo/Jan Kouba)

military helicopter W-3A Sokol

military helicopter W-3A Sokol

Czech Air Force Search and Rescue System's W-3A SOKOL, multipurpose two-engine turbo-shaft rescue helicopter at Big America, Czech Grand Canyon, abandoned limestone quarry near Morina village, Czech Republic, September 26, 2019. (CTK Photo/Jan Kouba)

military helicopter W-3A Sokol

military helicopter W-3A Sokol

Czech Air Force Search and Rescue System's W-3A SOKOL, multipurpose two-engine turbo-shaft rescue helicopter at Big America, Czech Grand Canyon, abandoned limestone quarry near Morina village, Czech Republic, September 26, 2019. (CTK Photo/Jan Kouba)

military helicopter W-3A Sokol

military helicopter W-3A Sokol

Czech Air Force Search and Rescue System's W-3A SOKOL, multipurpose two-engine turbo-shaft rescue helicopter at Big America, Czech Grand Canyon, abandoned limestone quarry near Morina village, Czech Republic, September 26, 2019. (CTK Photo/Jan Kouba)

military helicopter W-3A Sokol

military helicopter W-3A Sokol

Czech Air Force Search and Rescue System's W-3A SOKOL, multipurpose two-engine turbo-shaft rescue helicopter at Big America, Czech Grand Canyon, abandoned limestone quarry near Morina village, Czech Republic, September 26, 2019. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

Fighter plane JAS-39C Gripen

Fighter plane JAS-39C Gripen

Czech JAS-39 Gripen fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)

fighter planes L-159 Alca

fighter planes L-159 Alca

Czech L-159 Alca fighter planes during the training flights near Air Force Base at Caslav, Czech Republic, August 6, 2014. (CTK Photo/Jan Kouba)