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An Alenia Aermacchi M346 flies on display during Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

The British Army's Parachute Regiment display team, the Red Devils, perform during the Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

An Airbus A380-800 prepares to land during a flight demonstration at the Farnborough Airshow in Hampshire, southern England, on July 14, 2014. European planemaker Airbus on Monday launched the eagerly-awaited upgrade of its long-haul A330 passenger jet -- the A330neo -- to meet rising demand for cheaper, more fuel-efficient travel. AFP PHOTO / CARL COURT/AFP/Getty Images ( 531634312 )

Military helmets are displayed on the Transaero stand at the Farnborough air show in Hampshire, England, on July 14, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531636431 )

The British Army's Parachute Regiment display team, the Red Devils, perform during the Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

A model of the Blended Wing Body (BWB) aircraft which Southampton University is building is displayed during the Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. The aircraft was designed by MIT and Cambridge and puts the engines on top of the wings which reduces noise. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

Visitors look inside an unfitted Airbus A350 XWB as it stands on display during Farnborough International Air Show, Farnborough, England, Monday, July 14, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

An Airbus A400M military transport plane comes in to land during an air display on the second day of the Farnborough International Air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / CARL COURT/AFP/Getty Images ( 531659276 )

The Alenia AERMACCHI M345 aircraft flies at the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660142 )

The Alenia AERMACCHI M345 aircraft flies during a displayat the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660152 )

The Red Arrows perform a flypast to formally open the Farnborough air show in Hampshire, England, on July 14, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / CARL COURT/AFP/Getty Images ( 531632116 )

Airplane enthusiasts photograph an air display on the second day of the Farnborough International Air show in Hampshire, England, on July 15, 2014. AFP PHOTO / CARL COURT/AFP/Getty Images ( 531658952 )

The Alenia AERMACCHI M345 aircraft flies during a displayat the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660156 )

The Alenia AERMACCHI M345 aircraft flies during a display at the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660159 )

The Alenia AERMACCHI M345 aircraft flies during a display at the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660160 )

The Alenia AERMACCHI M345 aircraft flies during a display at the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660171 )

The Airbus A380 is displayed at the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660196 )

The Airbus A350 is displayed at the Farnborough air show in Hampshire, England, on July 15, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531660202 )

The cockpit of an Airbus A350 XWB is seen as it stands on display during Farnborough International Air Show, Farnborough, England, Monday, July 14, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

An AeroVironment Shrike vertical take-off and landing small unmanned aircraft system is displayed at the AeroVironment stand during Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

The Red Arrows perform a flypast to formally open the Farnborough air show in Hampshire, England, on July 14, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / CARL COURT/AFP/Getty Images ( 531632163 )

Physics student Katie Ley from Farnborough sits in a mock-up of the Lockheed Martin F-35 Lightning II cockpit at the Farnborough air show in Hampshire, England, on July 14, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. The week-long Farnborough airshow opened under a cloud however owing to the absence of the stricken US-built F-35 stealth fighter jet. The F-35, which was grounded in the United States last week because of an engine fire, will not appear as planned on the airshow's first day but might still take part at the end of the week, organisers said. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 531635578 )

An Alenia Aermacchi M346 flies on display during Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

A Eurofighter Typhoon flies on display during Farnborough International Air Show, Farnborough, England, Monday, July 14, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

The Royal Air Force (RAF) Red Arrows aerobatic display team perform a fly past Farnborough Airport to open the International Air Show, Farnborough, England, Monday, July 14, 2014. (AP Photo/Sang Tan) ( APTOPIX Britain Farnborough Air Show )

A Eurofighter Typhoon takes off for a flying display during Farnborough International Air Show, Farnborough, England, Monday, July 14, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

The Red Arrows perform a flypast to formally open the Farnborough air show in Hampshire, England, on July 14, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO/Leon NEAL/AFP/Getty Images ( 531631355 )

British Prime Minister David Cameron (2nd R) is pictured as he sits in the cockpit of an Airbus A350 aircraft on the first day of the Farnborough International Airshow in southern England, on July 14, 2014. David Cameron on Monday announced an investment of £1.1 billion (1.38 billion euros, $1.88 billion) into the armed forces, the bulk of it on intelligence and surveillance equipment. AFP PHOTO / BEN GURR/POOL/AFP/Getty Images ( 531633733 )

A Eurofighter Typhoon is pictured during a flight demonstration at the Farnborough air show in Hampshire, England, on July 14, 2014. The biennial event sees leading companies from the aviation industry showcase their latest technology. AFP PHOTO / CARL COURT/AFP/Getty Images ( 531636282 )

A security guard stands beneath an Airbus A400M military transport plane on the second day of the Farnborough International Air show in Hampshire, England, on July 15, 2014. AFP PHOTO / CARL COURT/AFP/Getty Images ( 531656485 )

A Boeing F/A-18 E/F Super Hornet flies on display during Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )

Visitors walk on board a Boeing 787 on display during Farnborough International Air Show, Farnborough, England, Tuesday, July 15, 2014. (AP Photo/Sang Tan) ( Britain Farnborough Air Show )