French Navy Rafale fighter jets are seen from the bridge of the aircraft carrier Charles de Gaulle at Changi Naval Base in Singapore, May 28, 2019. REUTERS/Feline Lim

Russian jet fighters fly over a bridge connecting the Russian mainland with the Crimean Peninsula with a cargo ship beneath it after three Ukrainian navy vessels were stopped by Russia from entering the Sea of Azov via the Kerch Strait in the Black Sea, Crimea November 25, 2018. REUTERS/Pavel Rebrov TPX IMAGES OF THE DAY

Russian jet fighters fly over vessels after the channel beneath a bridge connecting the Russian mainland with the Crimean Peninsula was blocked to stop three Ukrainian navy ships from entering the Sea of Azov via the Kerch Strait in the Black Sea, Crimea November 25, 2018. REUTERS/Pavel Rebrov

Russian jet fighters fly over vessels after the channel beneath a bridge connecting the Russian mainland with the Crimean Peninsula was blocked to stop three Ukrainian navy ships from entering the Sea of Azov via the Kerch Strait in the Black Sea, Crimea November 25, 2018. REUTERS/Pavel Rebrov

Russian jet fighters fly over a bridge connecting the Russian mainland with the Crimean Peninsula after three Ukrainian navy vessels were stopped by Russia from entering the Sea of Azov via the Kerch Strait in the Black Sea, Crimea November 25, 2018. REUTERS/Pavel Rebrov

Russian jet fighters fly over a bridge connecting the Russian mainland with the Crimean Peninsula with a cargo ship beneath it after three Ukrainian navy vessels were stopped by Russia from entering the Sea of Azov via the Kerch Strait in the Black Sea, Crimea November 25, 2018. REUTERS/Pavel Rebrov

Russian jet fighters fly over a bridge connecting the Russian mainland with the Crimean Peninsula after three Ukrainian navy vessels were stopped by Russia from entering the Sea of Azov via the Kerch Strait in the Black Sea, Crimea November 25, 2018. REUTERS/Pavel Rebrov

Pasengers walk on a jet bridge to board a plane at Nice International airport in Nice, France, September 19, 2018. REUTERS/Eric Gaillard

People walk on a bridge on a summer day near the Jet d'Eau (water fountain) in Geneva, Switzerland, August 16, 2018. REUTERS/Denis Balibouse

People walk on a bridge on a summer day near the Jet d'Eau (water fountain) in Geneva, Switzerland, August 16, 2018. REUTERS/Denis Balibouse

90th Academy Awards - Oscars Show - Hollywood, California, U.S., 04/03/2018 - Best Costume Design winner Mark Bridges rides a jet ski with actress Helen Mirren on the back after he won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson TPX IMAGES OF THE DAY

90th Academy Awards - Oscars Show - Hollywood, California, U.S., 04/03/2018 - Best Costume Design winner Mark Bridges rides a jet ski onto the stage as Oscars host Jimmy Kimmel gives actress Helen Mirren a kiss after Bridges won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson

90th Academy Awards - Oscars Show – Hollywood - Best Costume Design winner Mark Bridges rides a jet ski onto the stage as Oscars host Jimmy Kimmel gives actress Helen Mirren on the back a kiss after Bridges won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson

90th Academy Awards - Oscars Show - Hollywood, California, U.S., 04/03/2018 - Best Costume Design winner Mark Bridges rides a jet ski onto the stage with actress Helen Mirren on the back after he won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson

90th Academy Awards - Oscars Show – Hollywood - Best Costume Design winner Mark Bridges rides a jet ski with actress Helen Mirren on the back after he won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson

90th Academy Awards - Oscars Show - Hollywood, California, U.S., 04/03/2018 - Best Costume Design winner Mark Bridges rides a jet ski with actress Helen Mirren on the back after he won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson

90th Academy Awards - Oscars Show – Hollywood - Best Costume Design winner Mark Bridges rides a jet ski with actress Helen Mirren on the back after he won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson

90th Academy Awards - Oscars Show - Hollywood, California, U.S., 04/03/2018 - Best Costume Design winner Mark Bridges rides a jet ski with actress Helen Mirren on the back after he won it for the shortest Oscar acceptance speech of 2018. REUTERS/Lucas Jackson

People ride jet skis on the East River in front of the Brooklyn Bridge on a warm day in New York City, U.S., August 13, 2017. REUTERS/Joe Penney

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers wide receiver Sammie Coates (14) drops a pass as he is covered by New York Jets cornerback Darryl Roberts (27) during the first half of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets wide receiver Quincy Enunwa (81) runs the ball against Pittsburgh Steelers safety Sean Davis (28) during the first half of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers safety Mike Mitchell (23) pushes New York Jets wide receiver Brandon Marshall (15) out of bounds during the first half of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets running back Bilal Powell (29) is tackled by Pittsburgh Steelers defenders during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets running back Matt Forte (22) is tackled by Pittsburgh Steelers linebacker Jarvis Jones (95) during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets quarterback Ryan Fitzpatrick (14) throws a pass against the Pittsburgh Steelers during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers quarterback Ben Roethlisberger (7) celebrates a touchdown pass against the New York Jets during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers running back Le'Veon Bell (26) runs the ball against the New York Jets during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets running back Bilal Powell (29) is tackled by a Pittsburgh Steelers defender during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets running back Bilal Powell (29) runs the ball against the Pittsburgh Steelers during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers wide receiver Antonio Brown (84) runs the ball between New York Jets cornerback Marcus Williams (20) and linebacker Darron Lee (50) during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers running back Le'Veon Bell (26) runs the ball past New York Jets cornerback Marcus Williams (20) during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers running back Le'Veon Bell (26) runs the ball against the New York Jets during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers quarterback Ben Roethlisberger (7) throws a pass against the New York Jets during the second half of their game at Heinz Field. The Steelers won, 31-13. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers quarterback Ben Roethlisberger (7) prepares to throw a pass against New York Jets defensive lineman Muhammad Wilkerson (96) during the first half of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers wide receiver Antonio Brown (84) runs the ball past New York Jets linebacker Erin Henderson (58) and cornerback Buster Skrine (41) during the first half of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; Pittsburgh Steelers running back Le'Veon Bell (26) runs the ball past New York Jets linebacker David Harris (52) during the first half of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets quarterback Ryan Fitzpatrick (14) looks to pass against Pittsburgh Steelers safety Sean Davis (28) during the first quarter of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Oct 9, 2016; Pittsburgh, PA, USA; New York Jets running back Matt Forte (22) rushes the ball against the Pittsburgh Steelers during the first quarter of their game at Heinz Field. Mandatory Credit: Jason Bridge-USA TODAY Sports

Trucks move across the bridge linking North Korea with the Chinese border city of Dandong in this March 3, 2016 file photo. China on Tuesday, April 5, 2016, banned imports of gold and rare earths from North Korea as well as exports to the country of jet fuel and other oil products used to make rocket fuel, a move in line with new United Nations sanctions on Pyongyang. REUTERS/Megha Rajagopalan

Pope Francis descends the stairs of the papal plane after arriving in the United States at Joint Base Andrews outside Washington September 22, 2015. REUTERS/Tony Gentile

Pope Francis descends the air stairs from his aircraft to be welcomed by U.S. President Barack Obama (not pictured) upon his arrival at Joint Base Andrews outside Washington September 22, 2015. REUTERS/Kevin Lamarque

Pope Francis arrives for the first time in the United States at Joint Base Andrews, Maryland September 22, 2015. REUTERS/Kevin Lamarque

An Air Force personnel keeps watch as a crew member removes the passenger stairs from Air Force One after U.S. President Barack Obama's arrival at Joint Base Andrews in Washington September 14, 2015. Obama traveled to Des Moines, Iowa to hold a town hall to discuss college access and affordability. REUTERS/Carlos Barria

U.S. President Barack Obama salutes as he disembarks from Air Force One at Joint Base Andrews, Maryland, August 25, 2015. President Barack Obama, fresh from vacation and nine rounds of golf in MarthaÕs Vineyard, launched into a busy two weeks promoting renewable energy and his nuclear deal with Iran. REUTERS/Carlos Barria

U.S. President Barack Obama arrives aboard Air Force One at Joint Base Andrews, Maryland, August 25, 2015. President Barack Obama, fresh from vacation and nine rounds of golf in Martha's Vineyard, launched into a busy two weeks promoting renewable energy and his nuclear deal with Iran. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

U.S. President Barack Obama waves as he boards Air Force One on the way back to Washington at the McCarran International Airport in Las Vegas, Nevada August 25, 2015. REUTERS/Carlos Barria

U.S. Secretary of State John Kerry walks up the stairs as he boards his aircraft from Andrews Air Force Base for a flight to Havana, Cuba, August 14, 2015. Kerry declared a new era in relations as he celebrated restored diplomatic ties in Havana on Friday, but he also urged political change in Cuba, telling Cubans they should be free to choose their own leaders. REUTERS/Pablo Martinez Monsivais/Pool

U.S. President Barack Obama arrives aboard Air Force One at Jomo Kenyatta International Airport in Nairobi July 24, 2015. U.S. President Barack Obama flew into Kenya late on Friday for his first presidential visit to his father's homeland, aiming to boost trade and security ties in east Africa. REUTERS/Thomas Mukoya

U.S. President Barack Obama arrives to board Air Force One for travel to Kenya and Ethiopia from Joint Base Andrews, Maryland July 23, 2015. Obama will land in Kenya on Friday with a mission to strengthen U.S. security and economic ties, but his personal connection to his father's birthplace will dominate a trip that Kenyans view as a native son returning home. REUTERS/Jonathan Ernst

U.S. President Barack Obama boards Air Force One for travel to Kenya and Ethiopia from Joint Base Andrews, Maryland July 23, 2015. Obama will land in Kenya on Friday with a mission to strengthen U.S. security and economic ties, but his personal connection to his father's birthplace will dominate a trip that Kenyans view as a native son returning home. REUTERS/Jonathan Ernst

U.S. President Barack Obama waves as he boards Air Force One for travel to Kenya and Ethiopia from Joint Base Andrews, Maryland July 23, 2015. Obama will land in Kenya on Friday with a mission to strengthen U.S. security and economic ties, but his personal connection to his father's birthplace will dominate a trip that Kenyans view as a native son returning home. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY

U.S. President Barack Obama boards Air Force One for travel to Kenya and Ethiopia from Joint Base Andrews, Maryland July 23, 2015. Obama will land in Kenya on Friday with a mission to strengthen U.S. security and economic ties, but his personal connection to his father's birthplace will dominate a trip that Kenyans view as a native son returning home. REUTERS/Jonathan Ernst

A passenger jet makes its final approach over the Memorial Bridge in Washington, United States June 1, 2015. Completed in January of 1932 to connect Washington and Arlington National Cemetery, the bascule center portion of the bridge, which last opened in 1961, is rusting away and in need of serious repairs. Last month, U.S. President Barack Obama who said he was in discussions with congressional leaders on an infrastructure funding bill asked for a six-year, $478 billion transportation bill but lawmakers have not reached agreement on how to fund a long-term bill. Photo taken June 1. REUTERS/Gary Cameron

A passenger jet makes its final approach over the Memorial Bridge in Washington, United States June 1, 2015. Completed in January of 1932 to connect Washington and Arlington National Cemetery, the bascule center portion of the bridge, which last opened in 1961, is rusting away and in need of serious repairs. Last month, U.S. President Barack Obama who said he was in discussions with congressional leaders on an infrastructure funding bill asked for a six-year, $478 billion transportation bill but lawmakers have not reached agreement on how to fund a long-term bill. Photo taken June 1. REUTERS/Gary Cameron

The roof of the Sydney Opera House is pictured as a JetStar Airlines Airbus A320 plane flies near delegates from the inaugural China Australia Millennial Project (CAMP) summit as they stand atop the Sydney Harbour Bridge in Australia June 1, 2015. The climb was the opening event of the five-day summit which is being promoted as a way for "industry and government leaders from both countries to create a more innovative, collaborative Australia-China relationship". REUTERS/David Gray TPX IMAGES OF THE DAY

Passengers board a Ukrainian airplane at Bassel al-Assad international airport in Latakia, May 24, 2015. Syria welcomed its first commercial flight from Europe in three years as an Autolux flight from the Ukrainian capital Kiev arrived in the government-held coastal city of Latakia on Sunday. Only 10 passengers arrived in Syria on the flight with return tickets costing around $600 per person. Picture taken May 24, 2015. REUTERS/Omar Sanadiki TPX IMAGES OF THE DAY

Yemenis, who were stranded in Egypt, pray as they disembark from their plane after returning home, at Sanaa international aiport May 20, 2015. Some 200 Yemenis who have been stuck in Egypt and unable to return home arrived in the capital Sanaa on Wednesday in the first such flight from Egypt, though many more are expected in the coming days and weeks, officials say. REUTERS/Khaled Abdullah

A man holds an umbrella as he stands on the deck of a tourist boat that passes under jets of water that shoot from the Moonlight Rainbow Fountain running along Banpo Bridge in Seoul, May 10, 2015. REUTERS/Thomas Peter

Jet fighters from the Su-30 SM "Sokoly Rossii" (Falcons of Russia) aerobatic team fly during rehearsals for a show above the Yenisei River in Krasnoyarsk, Siberia, October 24, 2014. The show is conducted as part of a recruitment drive for Russia's military divisions, targeting the youth towards contractual military service, according to organizers. REUTERS/Ilya Naymushin (RUSSIA - Tags: MILITARY SOCIETY)

An Australian national flag and a New South Wales state flag (top) fly at half-mast atop the Sydney Harbour Bridge on July 19, 2014, as a sign of respect for those killed in the Malaysia Airlines passenger jetliner MH17 that crashed over eastern Ukraine. At bottom, a ferry passes the Sydney Opera House. Australian Prime Minister Tony Abbott blamed Russia on Friday for the shooting down of MH17, killing all 298 people on board, including 28 Australians. Abbott appeared to go further than other Western leaders in apportioning blame over the crash, demanding that Moscow answer questions about the "Russian-backed rebels" that he said were behind the disaster. REUTERS/David Gray (AUSTRALIA - Tags: TRANSPORT DISASTER)