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A U.S. Navy P-8 Posedion manufactured by Boeing Co. stands on display at the Singapore Airshow held at the Changi Exhibition Centre in Singapore, on Tuesday, Feb. 16, 2016. The air show runs through Feb. 21. Photographer: SeongJoon Cho/Bloomberg via Getty Images

A U.S. Navy P-8 Posedion manufactured by Boeing Co. stands on display at the Singapore Airshow held at the Changi Exhibition Centre in Singapore, on Tuesday, Feb. 16, 2016. The air show runs through Feb. 21. Photographer: SeongJoon Cho/Bloomberg via Getty Images

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FAIRFORD, ENGLAND - JULY 09: Navy Boeing P-8A Poseidon at RAF Fairford on July 9, 2016 in Fairford, England. (Photo by Steve Thorne/Getty Images)

FAIRFORD, ENGLAND - JULY 09:  Navy Boeing P-8A Poseidon at RAF Fairford on July 9, 2016 in Fairford, England.  (Photo by Steve Thorne/Getty Images)

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GEELONG, AUSTRALIA - MARCH 5 : A Royal Australian Air Force KC-30A refuels two F/A -18F Super Hornet by Boeing operated by the ADF (Australian Defence Force) in the air during the Australian International Airshow at Avalon Airport in Geelong, Australia on March 5 2017. The Australian International Aerospace & Defence Exposition is the biggest of its kind in the Southern Hemisphere. (Photo by Asanka Brendon Ratnayake/Anadolu Agency/Getty Images)

GEELONG, AUSTRALIA - MARCH 5 : A Royal Australian Air Force KC-30A refuels two F/A -18F Super Hornet by Boeing operated by the ADF (Australian Defence Force) in the air during the Australian International Airshow at Avalon Airport in Geelong, Australia on March 5 2017. The Australian International Aerospace & Defence Exposition is the biggest of its kind in the Southern Hemisphere. (Photo by Asanka Brendon Ratnayake/Anadolu Agency/Getty Images)

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A pilot of a US Navy Boeing P-8A Posiedon looks out of his window at the 2017 Royal International Air Tattoo at RAF Fairford in Gloucestershire. (Photo by Andrew Matthews/PA Images via Getty Images)

A pilot of a US Navy Boeing P-8A Posiedon looks out of his window at the 2017 Royal International Air Tattoo at RAF Fairford in Gloucestershire. (Photo by Andrew Matthews/PA Images via Getty Images)

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An aircraft flies past a Boeing Co. P8 aircraft during the Aero India air show at Air Force Station Yelahanka in Bengaluru, India, on Wednesday, Feb. 15, 2017. More than 750 global and Indian companies will attend the international show which runs through Feb. 18. Photographer: Dhiraj Singh/Bloomberg via Getty Images

An aircraft flies past a Boeing Co. P8 aircraft during the Aero India air show at Air Force Station Yelahanka in Bengaluru, India, on Wednesday, Feb. 15, 2017. More than 750 global and Indian companies will attend the international show which runs through Feb. 18. Photographer: Dhiraj Singh/Bloomberg via Getty Images