Britain's Prime Minister Theresa May speaks with guests as she opens the Farnborough Airshow in Britain, on July 16, 2018. [Photo/VCG]

The Red Arrows fly in formation around a spitfire during the opening day of the Farnborough International Airshow in Hampshire on July 16, 2018. [Photo/VCG]

The Red Arrows fly in formation around a spitfire during the opening day of the Farnborough International Airshow in Hampshire on July 16, 2018. [Photo/VCG]

The Red Arrows fly in formation around a spitfire during the opening day of the Farnborough International Airshow in Hampshire on July 16, 2018. [Photo/VCG]

A Boeing 787 puts on a display at the Farnborough Airshow, in Farnborough, Britain, July 16, 2018. [Photo/Agencies]

An MRJ is watched after a display at the Farnborough Airshow, in Farnborough, Britain, July 16, 2018. [Photo/Agencies]

A Lockheed Martin aircraft performs a display at the Farnborough Airshow, in Farnborough, Britain, July 16, 2018. [Photo/Agencies]