A coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

Medicals prepare before a coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

Medicals prepare before a coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A medical staff waves as a patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A coronavirus disease (COVID-19) infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

A COVID-19 infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden, as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

Medical workers prepare before an infected patient from France is transferred from an ambulance aircraft to an ambulance car at the airport in Dresden as the spread of the coronavirus disease (COVID-19) continues in Dresden, Germany April 2, 2020. REUTERS/Matthias Rietschel 

Airport firefighters give a water salute to welcome a new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

Airport firefighters give a water salute to welcome a new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

The new logo of Swiss air rescue company REGA is seen on a new Bombardier Challenger 650 ambulance aircraft in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

The interior of a new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA is seen in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

A new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA is shown to the media in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

A new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA is shown to the media in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

A new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA is shown to the media in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

Medical doctor Andre Keisker and intensive care flight nurse Thomas Burren stand inside of a new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

CEO Ernst Kohler of Swiss air rescue company REGA leaves new Bombardier Challenger 650 ambulance aircraft after the annual news conference in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

Technicians stand in front of a new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA at its headquarters in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

Pilot Nadine Flueckiger sits in the cockpit of a new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

A new Bombardier Challenger 650 ambulance aircraft of Swiss air rescue company REGA arrives at its headquarters in Kloten, Switzerland April 17, 2018. REUTERS/Arnd Wiegmann 

Technicians of Swiss air rescue company REGA are seen during service works on a Challenger CL-604 ambulance aircraft at the REGA base in Kloten, Switzerland April 6, 2017. REUTERS/Arnd Wiegmann 

Britain's Prince Harry takes in the Air Ambulance Operation Game during a charity trading day at ICAP in support of his charity Sentebale, in London, December 7, 2016. REUTERS/Geoff Pugh/Pool 

Helicopters of rescue services and an ambulance are seen at a field near Bad Aibling in southwestern Germany, February 9, 2016. About eight people were seriously injured and 12 more slightly hurt in a train crash in the southern state of Bavaria on Tuesday, German police said. REUTERS/Michael Dalder

A person that was injured after the Mini driven by Guo Meiling of China went off the road, is taken onto a helicopter during the Buenos Aires-Rosario prologue stage of Dakar Rally 2016 in Arrecifes, Argentina, January 2, 2016. REUTERS/Marcos Brindicci 

A police vehicle escorts ambulances carrying the bodies of victims from the site of a crashed aircraft on the outskirts of New Delhi, India, December 22, 2015. The aircraft crashed into a wall and burst into flames on the outskirts of the Indian capital, New Delhi, on Tuesday, killing all 10 people on board, officials said. REUTERS/Adnan Abidi 

An ambulance is driven away after the aircraft carrying Shaker Aamer, the last British resident to be held at the U.S. prison camp in the Guantanamo Bay navy station in Cuba, arrived at Biggin Hill airport near London, October 30, 2015. Aamer has been freed after 13 years in detention, Britain said on Friday. Aamer, a Saudi national who is married to a Briton, was never charged with any crime and had been cleared for release by U.S. authorities in 2007 but was not freed. REUTERS/Paul Hackett 

An ambulance is driven away after the aircraft carrying Shaker Aamer, the last British resident to be held at the U.S. prison camp in the Guantanamo Bay navy station in Cuba, arrived at Biggin Hill airport near London, October 30, 2015. Aamer has been freed after 13 years in detention, Britain said on Friday. Aamer, a Saudi national who is married to a Briton, was never charged with any crime and had been cleared for release by U.S. authorities in 2007 but was not freed. REUTERS/Peter Nicholls 

Paramedics (top) carry the stretcher of a Mexican tourist, who was injured during an attack in Egypt, to a platform from a plane, after their arrival to the presidential hangar in Mexico City, September 18, 2015. Six Mexican tourists who survived a deadly air raid on their convoy by Egyptian security forces returned home on Friday, as the government vowed to press for answers over how the group was mistaken for militants. Wrapped in blankets, some draped with red, white and green Mexican flags and strapped to gurneys, survivors were lowered on a platform from the presidential plane, which President Enrique Nieto sent to Egypt with the foreign minister to bring them home. REUTERS/Tomas Bravo 

A presidential guard keeps watch as paramedics (rear) receive Mexican tourists injured during an attack in Egypt, after their arrival to the presidential hangar in Mexico City, September 18, 2015. Egyptian warplanes mistakenly bombed a convoy of Mexican tourists five times over three hours, even though security forces on the ground had cleared their passage, one of six survivors of Sunday's deadly attack said. REUTERS/Tomas Bravo 

A medical officer helps a wounded Yemeni inside an ambulance after he arrived in an airplane to receive treatment in Sudan hospitals, at Khartoum airport, Sudan September 5, 2015. REUTERS/Mohamed Nureldin Abdallah 

Emergency vehicles and ambulances wait for the arrival of the remains of victims from the Trigana Air plane which crashed on a flight from Jayapura to Oksibil, at the airport in Sentani, near Jayapura, Papua, Indonesia August 18, 2015. All 54 people on board the Trigana Air aircraft were killed in a crash two days ago in Indonesia's Papua province, the latest in a string of aviation disasters in the Southeast Asian archipelago, officials said on Tuesday. REUTERS/Muhammad Yamin

An ambulance is seen next to a U.S. Navy P-3 Orion Maritime patrol aircraft after it landed at Incirlik airbase in the southern city of Adana, Turkey, July 25, 2015. REUTERS/Murad Sezer

Fire trucks and and an ambulance are seen next to a U.S. Navy P-3 Orion Maritime patrol aircraft after it landed at Incirlik airbase in the southern city of Adana, Turkey, July 25, 2015. REUTERS/Murad Sezer

An ambulance and a fire truck are seen next to a U.S. Navy P-3 Orion Maritime patrol aircraft after it landed at Incirlik airbase in the southern city of Adana, Turkey, July 25, 2015. REUTERS/Murad Sezer 

Maria Nelly Murillo is carried by a medical team after descending from an air force plane at Enrique Olaya airport in Medellin, Colombia June 25, 2015. The young mother Maria Nelly and her baby son were found on Wednesday, virtually unscathed, by a Colombian Air Force team, after surviving a plane crash in a jungle area of the Choco western province, the military said. REUTERS/Fredy Builes TPX IMAGES OF THE DAY 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH
The body of a victim who died after a helicopter crashed in Sindhupalchok District is carried towards an ambulance in Kathmandu June 2, 2015. The helicopter on an earthquake relief mission crashed in high mountains in northeast Nepal on Tuesday, killing at least four people, the army said. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY

The ambulances that carried some of the bodies of the victims of Monday's helicopter crash is seen parked outside the morgue of the Virgen de Fatima hospital in La Rioja, March 11, 2015. France mourned on March 10 the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

A policeman walks past an ambulance that carried some of the bodies of the victims of Monday's helicopter crash, seen parked outside the morgue of the Virgen de Fatima hospital in La Rioja, March 11, 2015. France mourned on March 10 the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

An ambulance that carried some of the bodies of the victims of Monday's helicopter crash is seen parked outside the morgue of the Virgen de Fatima hospital in La Rioja, March 11, 2015. France mourned on March 10 the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Ambulances carrying the remains of the victims killed in a helicopter crash leave the judicial morgue in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Workers of the judicial morgue look at coffins inside an ambulance in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. It was not confirmed that the coffins had the remains of some of the casualties of the accident. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Workers of the judicial morgue and policeman stand outside an ambulance carrying coffins in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. It was not confirmed that the coffins had the remains of some of the casualties of the accident. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Ambulances carrying the remains of the people killed in a helicopter crash enter a judicial morgue in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Ambulances carrying the remains of the people killed in a helicopter crash enter a judicial morgue in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Workers of the judicial morgue stand next to the ambulances carrying the remains of the people killed in a helicopter crash in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Workers of the judicial morgue stand next to one of the ambulances carrying the remains of the people killed in a helicopter crash in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Ambulances carrying the remains of the people killed in a helicopter crash enter a judicial morgue in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Workers of the judicial morgue and policemen stand next to one of the ambulances carrying the remains of the people killed in a helicopter crash in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

Ambulances carrying the remains of the people killed in a helicopter crash enter a judicial morgue in La Rioja, March 10, 2015. France mourned on Tuesday the deaths of three sports stars who were among 10 people killed when two helicopters collided in a remote region of Argentina during the filming of a reality TV show. Investigators removed the bodies of Olympic swimmer Camille Muffat, yachtswoman Florence Arthaud and boxer Alexis Vastine from the charred wreckage of the two aircraft, but said it was still unclear what caused the accident on Monday afternoon in the rugged western province of La Rioja. REUTERS/Marcos Brindicci (ARGENTINA - Tags: DISASTER SPORT TRANSPORT OLYMPICS) 

The body of an AirAsia QZ8501 passenger is carried to an ambulance from a Singapore Navy helicopter at the airbase in Pangkalan Bun, Central Kalimantan January 4, 2015. Indonesia's meteorological agency has said seasonal tropical storms probably contributed to the crash, and the weather has persistently hampered efforts to recover bodies and find the black box flight recorders that may explain why the Airbus A320-200 plunged into the sea a week ago.
REUTERS/Darren Whiteside (INDONESIA - Tags: DISASTER TRANSPORT MILITARY TPX IMAGES OF THE DAY) 

The interior of a room lies exposed in a building next to the home of Hamas Gaza leader Ismail Haniyeh, which Gaza's interior ministry said was hit by a missile fired by Israeli aircraft before dawn, causing damage but no casualties, in Gaza City July 29, 2014. Israel's month-long war against Hamas, with Israel carrying out air strikes, artillery bombardments and ground operations in response to constant militant rocket fire and attacks via tunnels, left more than 2,000 Palestinians dead, most of them civilians, as well as 64 Israeli soldiers and three civilians. It was the deadliest war in Gaza since Israel unilaterally withdrew from the territory in 2005 and included several incidents in which Israel was accused by rights groups of excessive use of force, war crimes or crimes against humanity. For its part, Hamas fired rockets indiscriminately at Israeli towns and cities, was accused of using civilians as human shields and of carrying out attacks from next to hospitals, from ambulances and inside densely populated areas. Picture taken July 29, 2014. REUTERS/Finbarr O'Reilly (GAZA - Tags: POLITICS MILITARY CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) 

A view of Emory University Hospital is seen after an ambulance carrying American doctor Kent Brantly, who has the Ebola virus, arrived via Dobbins Air Reserve Base in Atlanta, Georgia August 2, 2014. The first of two American aid workers infected with the deadly Ebola virus while in Liberia landed in the United States on Saturday, en route to an Atlanta hospital for treatment. A chartered medical aircraft carrying Brantly touched down at Dobbins Air Reserve Base in Marietta, Georgia shortly before noon, a base spokesman said. REUTERS/Tami Chappell (UNITED STATES - Tags: SOCIETY HEALTH) 

Emory University Hospital after an ambulance carrying American doctor Kent Brantly, who has the Ebola virus, arrived via Dobbins Air Reserve Base in Atlanta, Georgia August 2, 2014. The first of two American aid workers infected with the deadly Ebola virus while in Liberia landed in the United States on Saturday, en route to an Atlanta hospital for treatment. A chartered medical aircraft carrying Brantly touched down at Dobbins Air Reserve Base in Marietta, Georgia shortly before noon, a base spokesman said. REUTERS/Tami Chappell (UNITED STATES - Tags: SOCIETY HEALTH TRANSPORT) 

Members of the media wait in front of Emory University Hospital after an ambulance carrying American doctor Kent Brantly, who has the Ebola virus, arrived via Dobbins Air Reserve Base in Atlanta, Georgia August 2, 2014. The first of two American aid workers infected with the deadly Ebola virus while in Liberia landed in the United States on Saturday, en route to an Atlanta hospital for treatment. A chartered medical aircraft carrying Brantly touched down at Dobbins Air Reserve Base in Marietta, Georgia shortly before noon, a base spokesman said. REUTERS/Tami Chappell (UNITED STATES - Tags: SOCIETY HEALTH TRANSPORT MEDIA) 

An ambulance is seen near a German medical military aircraft in Boryspil airport March 12, 2014. Twenty-four injured Ukrainians are being flown to Germany for treatment. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST HEALTH MILITARY) 

Firefighters speak after extinguishing the wreckage of an aircraft that crashed near Villavicencio airport, in Colombia March 12, 2014. At least five people died after the Beechcraft 90 ambulance aircraft crashed while trying to land, according to local Civil Aviation Authority. REUTERS/Tatan Herrera (COLOMBIA - Tags: DISASTER TRANSPORT)