Britain's Prime Minister David Cameron (L) walks with Group Captain David Manning (R) past an RAF Eurofighter Typhoon fighter jet and a Royal Navy Wildcat multi-role helicopter during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

Britain's Prime Minister David Cameron (C) walks with Group Captain David Manning (R) past an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

Britain's Prime Minister David Cameron (C) walks with Group Captain David Manning (R) past an RAF Eurofighter Typhoon fighter jet and a Royal Navy Wildcat multi-role helicopter during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

Britain's Prime Minister David Cameron (3rd L) looks at an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

Britain's Prime Minister David Cameron (C) speaks with military personnel as he stands between an RAF Sentinel surveillance aircraft (L) and an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

Britain's Prime Minister David Cameron (C) speaks with military personnel as he stands between an RAF Sentinel surveillance aircraft (L) and an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

Britain's Prime Minister David Cameron looks at an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

Britain's Prime Minister David Cameron (C) looks at an RAF Eurofighter Typhoon fighter jet during his visit to Royal Air Force station RAF Northolt in London, Britain November 23, 2015. Britain will invest an extra 12 billion pounds ($18 billion) in defense equipment over the next 10 years including nine Boeing submarine-hunting aircraft, Cameron said on Monday. REUTERS/Justin Tallis/pool

A craftsman from a model-making company applies final touches to a full-sized model of a Typhoon fighter jet at the Celtic Manor Hotel, ahead of the NATO summit, in Newport, Wales, September 3, 2014. REUTERS/Leon Neal/Pool (BRITAIN - Tags: MILITARY POLITICS) 

A Eurofighter Typhoon aircraft of the Austrian Air force performs 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 (AUSTRIA - Tags: ENTERTAINMENT TRANSPORT MILITARY TPX IMAGES OF THE DAY) 

The image of an Eurofighter Typhoon is projected in the air by a laser show during the presentation and delivery of the 100th Eurofighter to the German airforce at headquarters of Military Air Systems Centre Cassidian in Manching near Ingolstadt, southern Germany, February 28, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: MILITARY BUSINESS TPX IMAGES OF THE DAY) 

A Eurofighter Typhoon is seen in the middle of a laser show during the presentation and delivery of the 100th Eurofighter to the German airforce at headquarter of Military Air Systems Centre Cassidian in Manching near Ingolstadt, southern Germany, February 28, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: MILITARY BUSINESS) 

A worker crosses the floor of the Eurofighter Typhoon production line at BAE systems Warton plant near Preston, northern England September 7, 2012. REUTERS/Phil Noble (BRITAIN - Tags: BUSINESS MILITARY) 

Typhoon jets taxi to their hangers at RAF Northolt in west London May 2, 2012. Four Typhoon jets arrived at the base on Wednesday to take part in defence exercises in advance of the London 2012 Olympic Games. REUTERS/Paul Hackett (BRITAIN - Tags: MILITARY SPORT OLYMPICS) 

A Swiss Boeing F/A-18C rolls along the taxiway at the Swiss Army Airbase in Emmen, central Switzerland November 14, 2008. REUTERS/Michael Buholzer (SWITZERLAND - Tags: TRANSPORT MILITARY POLITICS) 

An Eurofighter Typhoon fighter jet takes part in a flying display during the 49th Paris Air Show at the Le Bourget airport near Paris June 22, 2011. REUTERS/Pascal Rossignol (FRANCE - Tags: TRANSPORT MILITARY) 

INDIA-DEFENCE/ - Illustration and factbox comparing the Eurofighter Typhoon and Dassault Rafale warplanes which India has shortlisted for the country?s fighter jet order on Thursday. RNGS (SIN02) 

LIBYA/ARMS - Charts detailing top arms importers and exporters by nation. With factbox comparing the Eurofighter Typhoon and Dassault Rafale warplanes. Accompanies Reuters story LIBYA/ARMS. RNGS. (SIN04) 

A female pilot gets out from a British Eurofighter EF-2000 Typhoon after landing at the Gioia del Colle NATO Airbase in southern Italy March 23, 2011. Britain will host an international conference in London next Tuesday to discuss progress on the U.N.-mandated military intervention in Libya, British Foreign Secretary William Hague said on Wednesday. REUTERS/Giampiero Sposito (ITALY - Tags: POLITICS MILITARY CONFLICT TRANSPORT) 

Three Italian Air Force Eurofighter EF-2000 Typhoon fly over the Birgi NATO Airbase in Trapani on the southern Italian island of Sicily March 23, 2011. Western governments inched closer to a deal on Wednesday over who should lead military operations against Muammar Gaddafi's forces in Libya, with France saying NATO will have only a " technical role" . REUTERS/Tony Gentile (ITALY - Tags: POLITICS MILITARY CONFLICT TRANSPORT) 

An Italian Air Foce Eurofighter EF-2000 Typhoon flies over the Birgi NATO Airbase in Trapani on the southern Italian island of Sicily March 23, 2011. Western governments inched closer to a deal on Wednesday over who should lead military operations against Muammar Gaddafi's forces in Libya, with France saying NATO will have only a " technical role" . REUTERS/Tony Gentile (ITALY - Tags: POLITICS MILITARY CONFLICT TRANSPORT) 

British Royal Airforce Wing Commander Jez Attridge sits in the cockpit of his Eurofighter EF-2000 Typhoon jet after he lands at the Gioia del Colle NATO Airbase in southern Italy March 20, 2011. European and U.S. forces have unleashed warplanes and cruise missiles against Libyan targets under a U.N. Security Council resolution authorising military action to protect civilians from leader Muammar Gaddafi's forces. REUTERS/Giampiero Sposito ( ITALY - Tags: POLITICS MILITARY) 

An Italian Eurofighter EF-2000 Typhoon is parked in a hangar at the Gioia del Colle NATO Airbase in southern Italy March 20, 2011. Italy has deployed dozens of combat aircraft at its base at Trapani, in western Sicily in readiness for possible involvement in airstrikes on Libya. Eight jets have been assigned to the coalition command and are ready to take part in operations immediately, Defence Minister Ignazio La Russa said on Sunday. REUTERS/Giampiero Sposito ( ITALY - Tags: POLITICS MILITARY CONFLICT) 

A British Royal Air Force Eurofighter Typhoon moves past Indian Air Forces' Sukhoi SU-30 and Mirage 2000 fighter jets during an Indo-UK joint air force exercise at Kalaikunda airbase, about 130 km west from the eastern Indian city of Kolkata, November 2, 2010. REUTERS/Rupak De Chowdhuri (INDIA - Tags: MILITARY) 

A Eurofighter Typhoon jet takes part in a flying display during the 48th Paris Air Show at the Le Bourget airport near Paris, June 18, 2009. REUTERS/Pascal Rossignol (FRANCE TRANSPORT BUSINESS) 

A EADS Eurofighter Typhoon jet takes off in front of the Mount Pilatus at the Swiss Army Airbase in Emmen, central Switzerland November 11, 2008. The Swiss Army is evaluating the EADS Eurofighter, Saab Gripen and Dassault Rafale fighter planes as potential replacements for their older Tiger fighter jets. REUTERS/Michael Buholzer (SWITZERLAND) 

Pilots climb out of a EADS Eurofighter Typhoon jet as they landed at the Swiss Army Airbase in Emmen, central Switzerland November 6, 2008. The Swiss Army is evaluating the EADS Eurofighter, Saab Gripen and Dassault Rafale fighter planes as potential replacements for their older Tiger fighter jets. REUTERS/Michael Buholzer (SWITZERLAND) 

Typhoon jet flys over RAF Coningsby, central England, July 11, 2007. The planes were on display as it was announced by the RAF that they will take up a role to become responsible for protecting southern UK airspace from potential September 11 style attacks. REUTERS/Darren Staples (BRITAIN) 

Typhoon jets fly over RAF Coningsby, central England, July 11, 2007. The planes were on display as it was announced by the RAF that they will take up a role to become responsible for protecting southern UK airspace from potential September 11 style attacks. REUTERS/Darren Staples (BRITAIN) 

Romania's Prime Minister Calin Tariceanu looks at a Eurofighter Typhoon combat aircraft during the opening of the "Black Sea Defence & Aerospace - Exhibition & Conference" in Bucharest April 24, 2007. REUTERS/Mihai Barbu (ROMANIA) 

Four British Royal Air Force (RAF) Eurofighter Typhoons perform a fly-past at the annual Lord Mayor's Parade in central London, November 11, 2006. The event, a mix of tradition, parade and carnival, attracts a crowd of around half an million each year. REUTERS/Toby Melville (BRITAIN) 

EADS CEO's Philippe Camus (L) and Rainer Hertrich poses behind an A 400 M aeroplane before the company's annual news conference in Munich March 10, 2003. European Aeronautic, Defence & Space Company EADS, the world's second-largest aerospace firm, part of the Eurofighter consortium building the next-generation Typhoon fighter jet for [ Britain, Germany, Spain and Italy said, charges stemming from the company's restructuring of its space business would top 200 million euros in 2003.] 

EADS CEO's Philippe Camus (R) and Rainer Hertrich share a joke before
the company's annual news conference in Munich March 10, 2003. European
Aeronautic, Defence & Space Company EADS, the world's second-largest
aerospace firm, part of the Eurofighter consortium building the
next-generation Typhoon fighter jet for Britain, Germany, Spain and
Italy said, charges stemming from the company's restructuring of its
space business would top 200 million euros in 2003. REUTERS/Michael
Dalder

MAD/JOH/WS 

EADS CEO's Philippe Camus (R) and Rainer Hertrich share a joke before
the company's annual news conference in Munich March 10, 2003. European
Aeronautic, Defence & Space Company EADS, the world's second-largest
aerospace firm, part of the Eurofighter consortium building the
next-generation Typhoon fighter jet for Britain, Germany, Spain and
Italy said, charges stemming from the company's restructuring of its
space business would top 200 million euros in 2003. REUTERS/Michael
Dalder

MAD/JOH/WS 

The first UK production Eurofighter Typoon IPA1 performs at the
Farnborough International Airshow, July 23, 2002. The UK fighter made
its first public appearance and marked the official adoption of the
Typhoon name for the Royal Air Force. REUTERS/Ian Waldie

IW/CRB 

Visitors to an aviation exhibition in Beijing look at a British-made Euro-fighter Typhoon October 7. The annual exhibition features models of aircraft and weapons made in China and abroad.

NB