A WFP (World Food Program) helicopter is seen on the flooded airstrip, after heavy rains and floods forced hundreds of thousands of people to leave their homes, in the town of Pibor, Boma state, South Sudan, November 6, 2019. Picture taken November 6, 2019. REUTERS/Andreea Campeanu

A Guatemalan soldier is pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is seen during a military operation as they destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is seen during a military operation as they destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is seen during a military operation as they destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is seen during a military operation as they destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A view shows the cockpit of an army helicopter as it flies over an area during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

Guatemalan soldiers are pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

Guatemalan soldiers patrol during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

Guatemalan soldiers stand guard during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

Guatemalan soldiers are pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

A Guatemalan soldier is pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

Guatemalan soldiers are pictured during a military operation to destroy a clandestine airstrip used for smuggling drugs during a temporary state of siege in the village of Teleman, Guatemala September 20, 2019. Picture taken September 20, 2019. REUTERS/Josue Decavele

An aerial view shows an illegal airstrip for loggers and farmers, near the city of Altamira, Para state, Brazil, September 11, 2019. REUTERS/Nacho Doce

An aerial view shows an illegal airstrip for loggers and farmers, near the city of Altamira, Para state, Brazil, September 11, 2019. REUTERS/Nacho Doce

An aerial view shows an illegal airstrip for loggers and farmers, near the city of Altamira, Para state, Brazil, September 11, 2019. REUTERS/Nacho Doce

A technician walks on the airstrip on the aircraft carrier "Charles de Gaulle", after the completion of its 18 month-long renovation off Toulon, France, November 8, 2018. Christophe Simon/Pool via REUTERS

Technicians work near Rafale jet fighters on the airstrip on the aircraft carrier "Charles de Gaulle", after the completion of its 18 month-long renovation off Toulon, France, November 8, 2018. Christophe Simon/Pool via REUTERS

Technicians work near a Rafale jet fighter on the airstrip on the aircraft carrier "Charles de Gaulle", after the completion of its 18 month-long renovation off Toulon, France, November 8, 2018. Christophe Simon/Pool via REUTERS

Technicians stand on the airstrip on the aircraft carrier "Charles de Gaulle", after the completion of its 18 month-long renovation off Toulon, France, November 8, 2018. Christophe Simon/Pool via REUTERS

Technicians walk on the airstrip on the aircraft carrier "Charles de Gaulle", after the completion of its 18 month-long renovation off Toulon, France, November 8, 2018. Christophe Simon/Pool via REUTERS

A technician stands on the airstrip on the aircraft carrier "Charles de Gaulle", after the completion of its 18 month-long renovation off Toulon, France, November 8, 2018. Christophe Simon/Pool via REUTERS

Aeromexico aeroplanes are pictured on the airstrip at Benito Juarez international airport in Mexico City, Mexico, November 28, 2017. REUTERS/Ginnette Riquelme

An Embraer ERJ-190AR aeroplane of Aeromexico Connect, regional operator of Mexico's largest airline Aeromexico, is pictured at the airstrip at Benito Juarez international airport in Mexico City, Mexico, November 28, 2017. REUTERS/Ginnette Riquelme

Aeromexico aeroplanes are pictured on the airstrip at Benito Juarez international airport in Mexico City, Mexico, November 28, 2017. REUTERS/Ginnette Riquelme

Aeromexico aeroplanes are pictured on the airstrip at Benito Juarez international airport in Mexico City, Mexico, November 28, 2017. REUTERS/Ginnette Riquelme

An aeroplane of Aeromexico Connect, regional operator of Mexico's largest airline Aeromexico, is pictured at the airstrip at Benito Juarez international airport in Mexico City, Mexico, November 28, 2017. REUTERS/Ginnette Riquelme

Aeromexico aeroplanes are pictured on the airstrip at Benito Juarez international airport in Mexico City, Mexico, November 28, 2017. REUTERS/Ginnette Riquelme

An Interjet aeroplane prepares to land on the airstrip at Benito Juarez international airport in Mexico City, Mexico, June 27, 2017. REUTERS/Edgard Garrido

Aeromexico aeroplanes are pictured on the airstrip at Benito Juarez international airport in Mexico City, Mexico, June 27, 2017. REUTERS/Edgard Garrido

An Aeromexico aeroplane prepares to land on the airstrip at Benito Juarez international airport in Mexico City, Mexico, June 27, 2017. REUTERS/Edgard Garrido

A Volaris aeroplane prepares to land on the airstrip at Benito Juarez international airport in Mexico City, Mexico, June 27, 2017. REUTERS/Edgard Garrido

An Aeromexico aeroplane is seen on the airstrip during a launch event of the new alliance between AeroMexico and Delta Airlines and their announcement as sponsors of the Mexican soccer team, in Mexico City, Mexico, May 3, 2017. REUTERS/Edgard Garrido

U.S. President Barack Obama (3rd R) gets off from a helicopter at an airfield near Hiroshima Peace Memorial Park and Museum in Hiroshima, Japan May 27, 2016. REUTERS/Carlos Barria

A helicopter carrying U.S. President Barack Obama prepares to land at a airfield near Hiroshima Peace Memorial Park and Museum in Hiroshima, Japan May 27, 2016. REUTERS/Carlos Barria

Joaquin "El Chapo" Guzman (L) is escorted by soldiers during a presentation at the Navy's airstrip in Mexico City February 22, 2014. REUTERS/Henry Romero/File Photo

An Emergencies Ministry member walks accross the airstrip next to the crash site of a Boeing 737-800 Flight FZ981 operated by Dubai-based budget carrier Flydubai, at the airport of Rostov-On-Don, Russia, March 20, 2016. REUTERS/Maxim Shemetov

An Afghan C-130 military aircraft is parked at a military airfield in Kabul, Afghanistan February 11, 2016. REUTERS/Ahmad Masood

An Afghan security personnel keeps watch as a helicopter flies during the Afghanistan Air Force readiness performance program at a military airfield in Kabul, Afghanistan February 11, 2016. REUTERS/Ahmad Masood

Afghan pilots stand among aircrafts during the Afghanistan Air Force readiness performance program at a military airfield in Kabul, Afghanistan February 11, 2016. REUTERS/Ahmad Masood

Soldiers of the Mexican Navy await the arrrival of recaptured drug lord Joaquin "El Chapo" Guzman at the Navy's airstrip in Mexico City, Mexico January 8, 2016. Mexico recaptured the world's most notorious drug lord Guzman with U.S. help in a violent standoff on Friday, six months after he humiliated President Enrique Pena Nieto by tunnelling out of a maximum security prison. Guzman, head of the powerful Sinaloa Cartel whom Pena Nieto first caught in February 2014, was captured in an early morning raid that killed five in the city of Los Mochis in the drug baron's native state of Sinaloa in northwest Mexico. REUTERS/Henry Romero

Mexican soldiers stand guard atop a vehicle on a street awaiting the arrrival of recaptured drug lord Joaquin "El Chapo" Guzman at the Navy's airstrip in Mexico City, Mexico January 8, 2016. Mexico recaptured the world's most notorious drug lord Guzman with U.S. help in a violent standoff on Friday, six months after he humiliated President Enrique Pena Nieto by tunnelling out of a maximum security prison. Guzman, head of the powerful Sinaloa Cartel whom Pena Nieto first caught in February 2014, was captured in an early morning raid that killed five in the city of Los Mochis in the drug baron's native state of Sinaloa in northwest Mexico. REUTERS/Henry Romero

Journalists wait outside ahead of the arrrival of recaptured drug lord Joaquin "El Chapo" Guzman at the Navy's airstrip in Mexico City, Mexico January 8, 2016. Mexico recaptured the world's most notorious drug lord Guzman with U.S. help in a violent standoff on Friday, six months after he humiliated President Enrique Pena Nieto by tunnelling out of a maximum security prison. Guzman, head of the powerful Sinaloa Cartel whom Pena Nieto first caught in February 2014, was captured in an early morning raid that killed five in the city of Los Mochis in the drug baron's native state of Sinaloa in northwest Mexico. REUTERS/Henry Romero

A soldier stands guard awaiting the arrrival of recaptured drug lord Joaquin "El Chapo" Guzman at the Navy's airstrip in Mexico City, Mexico January 8, 2016. Mexico recaptured the world's most notorious drug lord Guzman with U.S. help in a violent standoff on Friday, six months after he humiliated President Enrique Pena Nieto by tunnelling out of a maximum security prison. Guzman, head of the powerful Sinaloa Cartel whom Pena Nieto first caught in February 2014, was captured in an early morning raid that killed five in the city of Los Mochis in the drug baron's native state of Sinaloa in northwest Mexico. REUTERS/Henry Romero

Residents fill sandbags to protect their homes after an El Nino-strengthened storm brought rain to Los Angeles, California, United States, January 6, 2016. REUTERS/Lucy Nicholson

Puddles and storm clouds are seen at an air field after an El Nino-strengthened storm in El Monte, California, United States, January 5, 2016. REUTERS/Lucy Nicholson

Puddles and storm clouds are seen at an air field after an El Nino-strengthened storm in El Monte, California, United States, January 5, 2016. REUTERS/Lucy Nicholson

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

Crowds cheer as Pope Francis arrives at Kololo airstrip in Kampala, November 28, 2015. Pope Francis left Kenya for Uganda where he will spend two days before continuing on to Central African Republic, a country wracked by sectarian conflict. REUTERS/Giuseppe Cacace/Pool

An airstrip and roads can be seen in outback Western Australia, November 12, 2015. REUTERS/David Gray