Eurocopter EC120 Colibri helicopters from the Spanish Air Force's aerobatic team "Patrulla Aspa" fly over La Malagueta beach during a military operational exhibition, on the eve of the celebrations to mark the Spanish Armed Forces Day in Malaga, southern Spain, May 28, 2011. REUTERS/Jon Nazca

The Red Arrows, the British Royal Air Force Aerobatic Team, performs at the Malta International Airshow 2013 at Malta International Airport, outside Valletta September 29, 2013. REUTERS/Darrin Zammit Lupi

Jurgis Kairys of Lithuania performs with a modified Russian Sukhoi Su-31 airplane during the Bucharest International Air Show at Baneasa airport June 22, 2014. REUTERS/Bogdan Cristel

A Serbian "Orao J-22" strike aircraft flies during the international air show in Belgrade September 2, 2012. Participants from 16 countries and the Serbian Airforce demonstrated their flying skills on Sunday to mark the 100th anniversary of military aviation in the Balkan country. The airshow at the Batajnica airport marks the first flight of a sole Serb biplane aircraft from the southern airfield of Nis during the 1912 Balkan war against Turkish empire. REUTERS/Marko Djurica

An F-16 FAB fighter jet from the Belgian Air Force flies over a beach during an airshow in Torre del Mar, southern Spain, July 31, 2016. REUTERS/Jon Nazca TPX IMAGES OF THE DAY - RTSKGTA

Republic of Singapore Air Force's Black Knights perform a manoeuvre during an aerial display at the Singapore Airshow February 13, 2014. REUTERS/Edgar Su

Two Sukhoi Su-30 planes from the Venezuelan Air Force take part in a military parade to commemorate the 200th anniversary of Venezuela's independence in Caracas April 19, 2010. REUTERS/Jorge Silva

Northrop F-5E Tiger II aircraft of the Swiss Air Force perform during the opening of the ILA Berlin Air Show in Selchow near Schoenefeld south of Berlin May 20, 2014. The ILA runs from May 20 till 25. REUTERS/Thomas Peter

Members of the Patrouille Suisse flight team of the Swiss Air Force perform in their Northrop F-5 ll Tiger fighting jets during a media day of the Swiss Air Force at the airbase in the central Swiss town of Emmen April 17, 2015. REUTERS/Arnd Wiegmann - RTR4XR4J

C-101 Aviojets from the Spanish Air Force aerobatic group Patrulla Aguila (Eagle Patrol) fly over a beach during an airshow in Torre del Mar, southern Spain, July 31, 2016. REUTERS/Jon Nazca TPX IMAGES OF THE DAY - RTSKGTC

DHL's Twisters & Extra 300 perform during the second day of the Bahrain Air Show 2016 at Sakhir, south of Bahrain January 22, 2016. REUTERS/Hamad I Mohammed TPX IMAGES OF THE DAY - RTX23K5L Image used for illustrative purposes

The IAF Aerobatic Team flying IAI Tzukit jet aircraft create a "heart" during a ceremony for graduating Israeli Air Force pilots at Hatzerim Air Base, June 28, 2010. REUTERS/Baz Ratner

The Royal Air Force aerobatic team, the Red Arrows, perform during a D-Day event in Portsmouth, southern England June 5, 2014. Ceremonies in Portsmouth, the embarkation point of much of the invasion force in June 1944, marked the 70th Anniversary of D-Day on Thursday. REUTERS/Stefan Wermuth

Members of the PC-7 flight team of the Swiss Air Force perform in their Pilatus PC-7 planes during a media day of the Swiss Air Force at the airbase in the central Swiss town of Emmen April 17, 2015. REUTERS/Arnd Wiegmann - RTR4XR79

Football Soccer - Boca Juniors v Independiente del Valle - Copa Libertadores - Alberto J. Armando stadium, Buenos Aires, Argentina - 14/7/16 - Former Argentine soccer star Diego Maradona waves as he attends the match. REUTERS/Marcos Brindicci - RTSI04K

The Black Eagles aerobatic team of South Korean Air Force (ROKAF) perform with their T-50 aircraft during the Singapore Airshow in Singapore February 11, 2014. REUTERS/Tim Chong

British Royal Air Force Red Arrows squadron performs aerobatics over Athens' Saronic Gulf September 6, 2005 REUTERS/Yannis Behrakis

The PC-7 team from Switzerland performs an aerobatics during the Air Show in Sion September 17, 2011. REUTERS/Valentin Flauraud

The Royal Air Force aerobatic team, the Red Arrows, perform during The Royal International Air Tattoo at the RAF in Fairford July 11, 2014. REUTERS/Stefan Wermuth

U.S. Air Force pilots with the Thunderbirds perform the calypso pass maneuver in F-16 Fighting Falcon aircraft during a practice session prior to the Gunfighter Skies air show at Mountain Home Air Force Base, Idaho, September 19 and released September 24, 2014. Picture taken September 19, 2014. REUTERS/US Air Force/Tech. Sgt. Manuel J. Martinez/Handout via Reuters

Veteran stuntwoman (wing walker) Jane Wicker and her pilot, Charlie Schwenker perform at Sun 'n Fun airshow in Lakeland, Florida in this photo taken March 29, 2012. Wicker and her pilot were killed on June 22, 2013 when their biplane crashed and burst into flames while doing aerobatics at an air show in Ohio, organizers of the event said. Picture taken taken March 29, 2012. REUTERS/Jon Ross Photography

Latvia's Baltic Bees aerobatic team performs on L-39C Albatross airplanes during Bucharest International Air Show at Baneasa airport July 27, 2013. REUTERS/Bogdan Cristel

A Russian-made Beriev Be-200ChS amphibious aircraft dumps some 12 tons of coloured water matching the Russian state flag during a demonstration flight at an air show dedicated to the Day of Aviation at the Yemelyanovo airport near Russia's Siberian city of Krasnoyarsk August 20, 2011. REUTERS/Ilya Naymushin

The Royal Air Force aerobatic team, the Red Arrows, perform during a D-Day event in Portsmouth, southern England June 5, 2014. Ceremonies in Portsmouth, the embarkation point of much of the invasion force in June 1944, marked the 70th Anniversary of D-Day on Thursday. REUTERS/Stefan Wermuth

Breitling Wingwalker aircrafts perform during the Air14 airshow at the airport in Payerne August 31, 2014. The Swiss Air Force celebrates their 100th anniversary with the biggest airshow in Europe this year. REUTERS/Denis Balibouse

The Breitling Aerobatic Team, flying L39 Albatros jets, make a pass by the moon during the Canadian International Air Show in Toronto, Ontario, September 6, 2015. REUTERS/Louis Nastro TPX IMAGES OF THE DAY - RTX1RDML

Members of the Italian aerobatic team Frecce Tricolori perform during the AirPower 13 air show at the Hinterstoisser air base in Zeltweg June 28, 2013. Over 200,000 spectators are expected to attend the air show which takes place June 28 to 29. REUTERS/Dominic Ebenbichler

Alpha jets of the Patrouille de France, the aerobatic team of the French Air Force, perform during the Malta International Airshow over Malta International Airport outside Valletta September 25, 2010. REUTERS/Darrin Zammit Lupi

Members of the Republic of Singapore Air Force (RSAF) Black Knights aerobatic team perform during a show at a military airport in Bangkok April 24, 2008. REUTERS/Chaiwat Subprasom

Aerobatic aircrafts emit coloured smoke trails as they perform during an airshow at the Abu Dhabi Air Expo February 25, 2014. REUTERS/Stringer

U.S. Air Force F-16 Thunderbirds fly in formation over General William J. Fox Airfield during a media day ahead of the Los Angeles County Air Show in Lancaster, California March 19, 2015. REUTERS/Mario Anzuoni - RTR4U3OF

A ring of water vapor is created as pilots Lt. Justin Halligan (L) and Lt. Michael Witt (R) fly their F/A-18F Super Hornet airplane within 200mph of breaking the sound barrier while performing at New York Air Show at Jones Beach in Wantagh, New York, May 23, 2009. The phenomenon is created when the plane, travelling at low altitudes over water, approaches the speed of sound and the pressure created by the forward sound waves squeezes moisture in the air to form a ball of cloud over the front of the aircraft. (7 of 11) REUTERS/Christopher Pasatieri

MiG-29 jet fighters of the Strizhi (Swifts) and Sukhoi Su-27 jet fighters of the Russkiye Vityazi (Russian Knights) aerobatic teams perform during a demonstration flight at the MAKS International Aviation and Space Salon in Zhukovsky outside Moscow August 27, 2013. The world's top aircraft makers, scenting a major opportunity in replacing ageing Russian air fleets, will be touting their wares at Moscow's MAKS air show this week in the hope of winning a big slice of that multi-billion dollar market. REUTERS/Maxim Shemetov

Switzerland's Air Force national flight team Patrouille Suisse performs during an exercise in their Northrop F-5E Tiger II aircrafts near the eastern Swiss town of Niederurnen September 6, 2013. REUTERS/Arnd Wiegmann