A British Airways Embraer ERJ-170STD airplane taxis at City Airport in London, Britain, September 3, 2018. REUTERS/Hannah McKay 

A British Airways Embraer ERJ-170STD airplane takes off from City Airport in London, Britain, September 3, 2018. REUTERS/Hannah McKay 

A Mitsubishi MRJ90STD taxis after a display at the Farnborough Airshow, in Farnborough, Britain July 16, 2018. REUTERS/Peter Nicholls 

A Mitsubishi MRJ90STD is directed after a display at the Farnborough Airshow, in Farnborough, Britain July 16, 2018. REUTERS/Peter Nicholls 

A Mitsubishi MRJ90STD is watched after a display at the Farnborough Airshow, in Farnborough, Britain July 16, 2018. REUTERS/Peter Nicholls 

A Mitsubishi MRJ90STD plane prepares to land after a display at the Farnborough Airshow, in Farnborough, Britain July 16, 2018. REUTERS/Peter Nicholls 

A British Airways Embraer ERJ-170STD aircraft lands next to a EasyJet plane ready for take off at Cointrin airport in Geneva, Switzerland September 26, 2017. REUTERS/Denis Balibouse 

A British Airways Embraer ERJ-170STD aircraft lands next to a EasyJet Airbus A320 plane ready for take off at Cointrin airport in Geneva, Switzerland September 26, 2017. REUTERS/Denis Balibouse 

A British Airways Embraer ERJ-170STD aircraft lands next to a EasyJet Airbus A320 plane ready for take off at Cointrin airport in Geneva, Switzerland September 26, 2017. REUTERS/Denis Balibouse 

Britain's Prince Harry takes an HIV test alongside singer Rihanna to highlight World AIDS Day in Bridgetown, Barbados December 1, 2016. REUTERS/Antonio Miller/Barbados Government Information Service (BGIS)/POOL 

Britain's Prince Harry takes an HIV test alongside singer Rihanna to highlight World AIDS Day in Bridgetown, Barbados December 1, 2016. REUTERS/Antonio Miller/Barbados Government Information Service (BGIS)/POOL 

Britain's Prince Harry takes an HIV test alongside singer Rihanna to highlight World AIDS Day in Bridgetown, Barbados December 1, 2016. REUTERS/Antonio Miller/Barbados Government Information Service (BGIS)/POOL 

Britain's Prince Harry takes an HIV test alongside singer Rihanna to highlight World AIDS Day in Bridgetown, Barbados December 1, 2016. REUTERS/Antonio Miller/Barbados Government Information Service (BGIS)/POOL TPX IMAGES OF THE DAY 

Canada's Prime Minister Justin Trudeau takes part in a World AIDS Day flag raising ceremony on Parliament Hill in Ottawa, Ontario, Canada, December 1, 2016. REUTERS/Chris Wattie 

Canada's Prime Minister Justin Trudeau takes part in a World AIDS Day flag raising ceremony on Parliament Hill in Ottawa, Ontario, Canada, December 1, 2016. REUTERS/Chris Wattie 

Canada's Prime Minister Justin Trudeau raises the World AIDS Day flag during a ceremony on Parliament Hill in Ottawa, Ontario, Canada, December 1, 2016. REUTERS/Chris Wattie 

People gather around lit candles in the shape of a ribbon during a HIV/AIDS awareness campaign ahead of World Aids Day, in Kathmandu, Nepal November 30, 2016. REUTERS/Navesh Chitrakar 

A participant with a red ribbon pin observes a minute of silence during a HIV/AIDS awareness campaign ahead of World Aids Day, in Kathmandu, Nepal November 30, 2016. REUTERS/Navesh Chitrakar 

A participant with a red ribbon pin takes part in a HIV/AIDS awareness campaign ahead of World Aids Day, in Kathmandu, Nepal November 30, 2016. REUTERS/Navesh Chitrakar 

People gather around lit candles in the shape of a ribbon during a HIV/AIDS awareness campaign ahead of World Aids Day, in Kathmandu, Nepal November 30, 2016. REUTERS/Navesh Chitrakar 

Flybe Embraer ERJ-175STD (top) and Bombardier Dash 8 Q400 aircraft taxi at Manchester Airport in Manchester, Britain June 28, 2016. REUTERS/Andrew Yates 

Prince Harry looks through a microscope at a sample of gonorrhoea as he visits the Burrell Street Sexual Health Clinic in London, Britain on July 14, 2016. REUTERS/Chris Jackson/Pool

U.S. Ambassador to the United Kingdom Matthew Barzun (L) holds a light from his mobile phone for singer Elton John as he speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett TPX IMAGES OF THE DAY

U.S. Ambassador to the United Kingdom Matthew Barzun (L) holds a light from his mobile phone for singer Elton John as he speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

Singer Elton John speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

Singer Elton John speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

Singer Elton John speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

Singer Elton John speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

U.S. Global AIDS Coordinator Ambassador Deborah Birx, U.S. Ambassador to the United Kingdom Matthew Barzun, singer Elton John, his partner David Furnish and the Ambassador's wife Brooke Brown Barzun (L-R) pose for a photo during a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

U.S. Global AIDS Coordinator Ambassador Deborah Birx, U.S. Ambassador to the United Kingdom Matthew Barzun, singer Elton John, his partner David Furnish and the Ambassador's wife Brooke Brown Barzun (L-R) pose for a photo during a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

HIV self tests are displayed in a pharmacy in Bordeaux, France, September 15, 2015. Home test kits for HIV/AIDS went on sale in French pharmacies on Tuesday, allowing users to learn in 15 minutes if they are infected. REUTERS/Regis Duvignau 

A pharmacist displays an HIV self test in a pharmacy in Bordeaux, France, September 15, 2015. Home test kits for HIV/AIDS went on sale in French pharmacies on Tuesday, allowing users to learn in 15 minutes if they are infected. REUTERS/Regis Duvignau 

HIV self tests are displayed in a pharmacy in Bordeaux, France, September 15, 2015. Home test kits for HIV/AIDS went on sale in French pharmacies on Tuesday, allowing users to learn in 15 minutes if they are infected. REUTERS/Regis Duvignau 

HIV self tests are displayed in a pharmacy in Bordeaux, France, September 15, 2015. Home test kits for HIV/AIDS went on sale in French pharmacies on Tuesday, allowing users to learn in 15 minutes if they are infected. REUTERS/Regis Duvignau 

A pharmacist displays an HIV self test in a pharmacy in Bordeaux, France, September 15, 2015. Home test kits for HIV/AIDS went on sale in French pharmacies on Tuesday, allowing users to learn in 15 minutes if they are infected. REUTERS/Regis Duvignau 

Activists of the All-Ukrainian Network of People Living With HIV/AIDS, a non-governmental group, take part in a rally in front of the Ukrainian cabinet of ministers building in Kiev, Ukraine, July 1, 2015. Demonstrators were protesting against the lack of government-supplied medicine for the around 30,000 HIV infected people in Ukraine. The placard reads:"A queue for medicines". REUTERS/Gleb Garanich 

Jenisley Dias, 23, talks to members of the media as she rests before giving birth at the Ana Betancourt de Mora Hospital in Camaguey, Cuba, June 19, 2015. The World Health Organization on Tuesday declared Cuba the first country in the world to eliminate the transmission of HIV and syphilis from mother to child. Picture taken June 19, 2015. REUTERS/Alexandre Meneghini

A new born baby rests beside his mother Dailyn Fleite (L), 29, at the Ana Betancourt de Mora Hospital in Camaguey, Cuba, June 19, 2015. The World Health Organization on Tuesday declared Cuba the first country in the world to eliminate the transmission of HIV and syphilis from mother to child. Picture taken June 19, 2015. REUTERS/Alexandre Meneghini

People pose for pictures inside candles that form the shape of an HIV/AIDS awareness "Red Ribbon" during the International AIDS Candlelight Memorial in San Salvador May 17, 2015. Thousands gather for community events around the world, every third sunday of May, in solidarity to light candles and remember those who have been affected by HIV/AIDS, according to the organisation. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

A man shows a packet of government-supplied 'Nirodh' condoms after collecting it from a distribution center at a hospital in New Delhi April 1, 2015. India is readying a redesign of the staid packaging of its half-century-old condom brand, incorporating pictures of handsome men and gorgeous women, in a desperate bid to seduce customers drawn to fancier versions sold by private firms. To match INDIA-HEALTH/CONDOMS REUTERS/Adnan Abidi 

Hostess Roxy Wood waits prior to the Drag Queen Bingo fundraiser to benefit the Pasadena Aids Service Center at Edwin Mills in Pasadena, California March 10, 2015. REUTERS/Mario Anzuoni (UNITED STATES - Tags: SOCIETY) 

11-year-old Sonia Matanga (L), who was born HIV-positive, attends a self-help group meeting with caregiver Davison Mungoni (R) in the village of Michelo, south of the Chikuni Mission in the south of Zambia February 23, 2015. The caregivers in the Jesuit-run home-based care project at the Chikuni Mission run a capacity-building and empowerment project at the household level, offering training and assistance in crop-growing and animal rearing, as well as offering companionship, pastoral care and monitoring antiretroviral treatment compliance of HIV-AIDS patients.
REUTERS/Darrin Zammit Lupi (ZAMBIA - Tags: SOCIETY HEALTH) 

Justina Kabuli and her 12-year-old son Andrew, both HIV-positive, remove weeds from their field of sweet potato crops during a visit by a home-based care team to their home in Chiyobola village, close to the town of Chikuni in the south of Zambia February 21, 2015. The caregivers on the Jesuit-run home-based care team at Chikuni run a capacity building and empowerment project at household level, offering training and assistance in crop-growing and animal rearing, as well as offering companionship, pastoral care and monitoring antiretroviral treatment compliance of HIV-AIDS patients. Picture taken February 21, 2015.
REUTERS/Darrin Zammit Lupi (ZAMBIA - Tags: HEALTH DRUGS SOCIETY AGRICULTURE) 

A 39-year-old Burmese migrant living with HIV shows her antiretroviral drugs to a journalist during an interview at the migrant health office of the NGO Raks Thai Foundation in the seafood industry town of Mahachai, Samut Sakhon province, February 6, 2015. Hospitals across the country are denying insurance and care to migrant labourers with AIDS-related illnesses despite an insurance scheme launched over a year ago, officials and rights advocates say. After four years of paying about 3,000 baht ($92) a month for her medicine and care, she was finally able to purchase health insurance in September 2013. The hospital where she purchased her health insurance still regularly refuses care to migrants with HIV. Picture taken February 6, 2015. To match Feature THAILAND-AIDS/MIGRANTS REUTERS/Athit Perawongmetha (THAILAND - Tags: HEALTH DRUGS SOCIETY) 

A nurse takes care of an AIDS patient at the Glory Hut Foundation in Chonburi province, east of Bangkok January 20, 2015. In mid-December, villagers in Lang Nern, a few kilometres outside the seaside resort of Pattaya, voted to evict the Glory Hut Foundation, a small HIV/AIDS hospice. Villagers say that Glory Hut did not consult them before setting up the centre, the presence of people living with HIV/AIDs hurts their businesses and they fear catching opportunistic diseases. There is no legal backing for the eviction vote, but the hospice may move after being socially ostracised. In a country that has been at the forefront of the fight against HIV/AIDS, incidents such as this underline the stigma and discrimination that people still face. Picture taken January 20. To match story THAILAND-HIV/DISCRIMINATION REUTERS/Chaiwat Subprasom (THAILAND - Tags: HEALTH) 

A man dressed in a condom costume walks at Caleta Portales beach, during a summer awareness campaign by the Chilean Corporation for the Prevention of AIDS in Valparaiso city, northwest of Santiago January 9, 2015. REUTERS/Rodrigo Garrido (CHILE - Tags: DISASTER HEALTH SOCIETY ENVIRONMENT) 

Waqas,12, who contracted HIV through a tainted blood transfusion, walks down a flight of stairs with his father after an interview with Reuters in Islamabad December 5, 2014. Lax oversight of blood banks means about a fifth of patients in Pakistan who get regular transfusions have been infected with hepatitis, a top government health official said on Friday. Some also get HIV. Pakistan's dangerously unregulated blood banks are in the spotlight after a charitable federation said 10 children getting transfusions for a blood disease contracted HIV. REUTERS/Zohra Bensemra (PAKISTAN- Tags: - Tags: HEALTH SOCIETY TPX IMAGES OF THE DAY) 

The statue of Christ the Redeemer is lit up in red to promote the "Test, Treat, Live Better" awareness campaign marking World AIDS Day in Rio de Janeiro December 1, 2014. REUTERS/Pilar Olivares (BRAZIL - Tags: SOCIETY HEALTH) 

A nurse (L) hands out a red ribbon to a woman, to mark World Aids Day, at the entrance of Emilio Ribas Hospital, in Sao Paulo December 1, 2014. The world has finally reached "the beginning of the end" of the AIDS pandemic that has infected and killed millions in the past 30 years, according to a leading campaign group fighting HIV. United Nations data show that in 2013, 35 million people were living with HIV, 2.1 million people were newly infected with the virus and some 1.5 million people died of AIDS. By far the greatest part of the HIV/AIDS burden is in sub-Saharan Africa. REUTERS/Nacho Doce (BRAZIL - Tags: HEALTH SOCIETY) 

A volunteer pins a red ribbon on the blouse of a sex worker, as her child looks on, during an event to mark World AIDS Day in Kamathipura, Mumbai's red light district, December 1, 2014. The event was organised by the Social Activities Integration, a non-profit organisation which provides free condoms and medical care to people living with HIV and AIDS. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY HEALTH TPX IMAGES OF THE DAY) 

Somjit, a former dancer in a transgender club and an AIDS patient, passes the time in front of her accommodation at the Buddhist temple Wat Prabat Nampu where she has been living for seven years in Lopburi province, north of Bangkok November 30, 2014. From 1992, the temple has provided housing for HIV positive patients and palliative care for those in the final stages of the AIDS disease. Data from 2013 estimates Thailand has 450,000 people living with HIV/AIDS, but only 353,000 have access to life-saving antiretroviral drugs. December 1 is World AIDS Day. Picture taken November 30, 2014. REUTERS/Damir Sagolj (THAILAND - Tags: SOCIETY HEALTH) 

A preserved body of an AIDS victim is displayed in a museum at the Buddhist temple Wat Prabat Nampu in Lopburi province, north of Bangkok November 30, 2014. From 1992, the temple has provided housing for HIV positive patients and palliative care for those in the final stages of the AIDS disease. Data from 2013 estimates Thailand has 450,000 people living with HIV/AIDS, but only 353,000 have access to life-saving antiretroviral drugs. December 1 is World AIDS Day. Picture taken November 30, 2014. REUTERS/Damir Sagolj (THAILAND - Tags: SOCIETY HEALTH TPX IMAGES OF THE DAY) 

Arun Lunt, a practically blind AIDS patient, cools herself in front of a fan at the Buddhist temple Wat Prabat Nampu where she has been living for seven years in Lopburi province, north of Bangkok November 30, 2014. From 1992, the temple has provided housing for HIV positive patients and palliative care for those in the final stages of the AIDS disease. Data from 2013 estimates Thailand has 450,000 people living with HIV/AIDS, but only 353,000 have access to life-saving antiretroviral drugs. December 1 is World AIDS Day. Picture taken November 30, 2014. REUTERS/Damir Sagolj (THAILAND - Tags: SOCIETY HEALTH TPX IMAGES OF THE DAY) 

A terminally ill patient raises his arm in a hospice for those dying of AIDS at the Buddhist temple Wat Prabat Nampu in Lopburi province, north of Bangkok November 30, 2014. From 1992, the temple has provided housing for HIV positive patients and palliative care for those in the final stages of the AIDS disease. Data from 2013 estimates Thailand has 450,000 people living with HIV/AIDS, but only 353,000 have access to life-saving antiretroviral drugs. December 1 is World AIDS Day. Picture taken November 30, 2014. REUTERS/Damir Sagolj (THAILAND - Tags: SOCIETY HEALTH TPX IMAGES OF THE DAY)