An Easyjet Airbus A319 plane is seen at Luton Airport, following the outbreak of the coronavirus disease (COVID-19), Luton, Britain, June 4, 2020. REUTERS/Paul Childs

An Easyjet Airbus A319 plane is seen at Luton Airport, following the outbreak of the coronavirus disease (COVID-19), Luton, Britain, June 4, 2020. REUTERS/Paul Childs

A U.S. Air Force transport plane carrying the batch of medical aid from the United States, including ventilators as a donation to help the country tackle the coronavirus outbreak, rolls upon landing at Vnukovo International Airport outside in Moscow, Russia, June 4, 2020. Pavel Golovkin/ Pool via REUTERS

Workers wearing protective gear sanitize a Vueling's Airbus A321 passenger plane at Rome's international Fiumicino Airport, after Italy allowed free movement and reopened its borders to European countries, easing more of its rigid lockdown restrictions due to the coronavirus disease (COVID-19) outbreak, in Rome, Italy, June 4, 2020. REUTERS/Remo Casilli

Workers wearing protective gear leave after sanitizing a Vueling's Airbus A321 passenger plane at Rome's international Fiumicino Airport, after Italy allowed free movement and reopened its borders to European countries, easing more of its rigid lockdown restrictions due to the coronavirus disease (COVID-19) outbreak, in Rome, Italy, June 4, 2020. REUTERS/Remo Casilli

A worker wearing protective gear carries a sanitizer into a Vueling's Airbus A321 passenger plane at Rome's international Fiumicino Airport, after Italy allowed free movement and reopened its borders to European countries, easing more of its rigid lockdown restrictions due to the coronavirus disease (COVID-19) outbreak, in Rome, Italy, June 4, 2020. REUTERS/Remo Casilli

Workers wearing protective gear sanitize a Vueling's Airbus A321 passenger plane at Rome's international Fiumicino Airport, after Italy allowed free movement and reopened its borders to European countries, easing more of its rigid lockdown restrictions due to the coronavirus disease (COVID-19) outbreak, in Rome, Italy, June 4, 2020. REUTERS/Remo Casilli

Workers wearing protective gear sanitize a Vueling's Airbus A321 passenger plane at Rome's international Fiumicino Airport, after Italy allowed free movement and reopened its borders to European countries, easing more of its rigid lockdown restrictions due to the coronavirus disease (COVID-19) outbreak, in Rome, Italy, June 4, 2020. REUTERS/Remo Casilli

A staff member of All Nippon Airways wearing a face shield is seen in front of a plane at a boarding gate amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A plane of All Nippon Airways is seen at Haneda airport, amid the coronavirus disease (COVID-19) outbreak, in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A staff member of All Nippon Airways wearing a protective mask and a face shield asks passengers to maintain 'social distance' as they stand in a line to board a plane at a boarding gate amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane which performed a domestic flight, amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon

A plane of Japan Airlines is seen at its maintenance center amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon

A staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane which performed a domestic flight, amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon

Grounded planes of German air carrier Lufthansa are parked at the airport as the spread of coronavirus disease (COVID-19) continues in Frankfurt, Germany, June 2, 2020. REUTERS/Kai Pfaffenbach

Grounded planes of German air carrier Lufthansa are parked at the airport as the spread of coronavirus disease (COVID-19) continues in Frankfurt, Germany, June 2, 2020. REUTERS/Kai Pfaffenbach

Grounded planes of German air carrier Lufthansa and Condor are parked at the airport as the spread of coronavirus disease (COVID-19) continues in Frankfurt, Germany, June 2, 2020. REUTERS/Kai Pfaffenbach

A Lufthansa plane takes off behind a grounded jet at the airport as the spread of coronavirus disease (COVID-19) continues in Frankfurt, Germany, June 2, 2020. REUTERS/Kai Pfaffenbach

Passengers wait to board their planes at Riyadh International Airport, after Saudi Arabia reopened domestic flights, following the outbreak of the coronavirus disease (COVID-19), in Riyadh, Saudi Arabia May 31, 2020. REUTERS/Ahmed Yosri

Brothers Shehryar and Shazin comfort each other as they mourn next to the coffin of their father Ansar Naqvi, journalist killed in the Pakistan International Airlines (PIA) flight PK8303 plane crash, during a funeral in Karachi, Pakistan May 30, 2020. REUTERS/Akhtar Soomro

People pray in front of the coffin, wrapped in a national flag, containing the body of Ansar Naqvi, journalist killed in the Pakistan International Airlines (PIA) flight PK8303 plane crash, during a funeral in Karachi, Pakistan May 30, 2020. REUTERS/Akhtar Soomro

Brothers Shehryar and Shazin comfort each other as they mourn next to the coffin of their father Ansar Naqvi, journalist killed in the Pakistan International Airlines (PIA) flight PK8303 plane crash, during a funeral in Karachi, Pakistan May 30, 2020. REUTERS/Akhtar Soomro

Shehryar comforts his brother Shazin, as they mourn next to the coffin of their father Ansar Naqvi, journalist killed in the Pakistan International Airlines (PIA) flight PK8303 plane crash, during a funeral in Karachi, Pakistan May 30, 2020. REUTERS/Akhtar Soomro

People move a coffin, wrapped in the national flag, containing the body of a victim of the Pakistan International Airlines' PK8303 plane crash, during funeral in Karachi, Pakistan May 29, 2020. REUTERS/Akhtar Soomro

Rescue workers and relatives move a coffin, wrapped in national flag, containing the body of a victim of the Pakistan International Airlines' PK8303 plane crash, during funeral in Karachi, Pakistan May 29, 2020. REUTERS/Akhtar Soomro

Rose petals and candles are seen during a vigil for the victims of the Pakistan International Airlines's PK8303 plane crash, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

Rose petals and candles are seen left by people after a vigil for the victims of the Pakistan International Airlines's PK8303 plane crash, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

A LATAM Airlines plane with the old TAM logo is seen parked at Brasilia International Airport as air traffic is affected by the outbreak of the coronavirus disease (COVID-19), in Brasilia, Brazil May 28, 2020. REUTERS/Ueslei Marcelino

A LATAM Airlines plane with the old TAM logo is seen parked at Brasilia International Airport as air traffic is affected by the outbreak of the coronavirus disease (COVID-19), in Brasilia, Brazil May 28, 2020. REUTERS/Ueslei Marcelino

A LATAM Airlines plane with the old TAM logo is seen parked at Brasilia International Airport as air traffic is affected by the outbreak of the coronavirus disease (COVID-19), in Brasilia, Brazil May 28, 2020. REUTERS/Ueslei Marcelino

A car park is seen behind a EasyJet plane at Luton Airport, following the outbreak of the coronavirus disease (COVID-19), Luton, Britain, May 1, 2020. Picture taken May 1, 2020 REUTERS/Andrew Boyers

EasyJet planes are seen at Luton Airport, following the outbreak of the coronavirus disease (COVID-19), Luton, Britain, May 1, 2020. Picture taken May 1, 2020 REUTERS/Andrew Boyers

A EasyJet plane is seen at Luton Airport, following the outbreak of the coronavirus disease (COVID-19), Luton, Britain, May 1, 2020. Picture taken May 1, 2020 REUTERS/Andrew Boyers

A EasyJet plane is seen at Luton Airport, following the outbreak of the coronavirus disease (COVID-19), Luton, Britain, May 1, 2020. Picture taken May 1, 2020 REUTERS/Andrew Boyers

A LATAM Airlines plane with the old TAM logo is seen parked at Brasilia International Airport as air traffic is affected by the outbreak of the coronavirus disease (COVID-19), in Brasilia, Brazil May 28, 2020. REUTERS/Ueslei Marcelino

A LATAM Airlines plane with the old TAM logo is seen parked at Brasilia International Airport as air traffic is affected by the outbreak of the coronavirus disease (COVID-19), in Brasilia, Brazil May 28, 2020. REUTERS/Ueslei Marcelino

A LATAM Airlines plane with the old TAM logo is seen parked at Brasilia International Airport as air traffic is affected by the outbreak of the coronavirus disease (COVID-19), in Brasilia, Brazil May 28, 2020. REUTERS/Ueslei Marcelino

A worker walks past a truck loaded with the wreckage of the crashed Pakistan International Airlines' PK8303 plane, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

A worker stands on a truck as it is loaded with the wreckage of the crashed Pakistan International Airlines' PK8303 plane, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

A worker reacts as a truck is loaded with the wreckage of the crashed Pakistan International Airlines' PK8303 plane, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

A worker gestures as the truck is loaded with the wreckage of the crashed Pakistan International Airlines' PK8303 plane, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

Workers cover a truck with the wreckage of the crashed Pakistan International Airlines' PK8303 plane at the site, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

A police officer stands guard beside a truck loaded with the wreckage of the crashed Pakistan International Airlines' PK8303 plane, in Karachi, Pakistan May 28, 2020. REUTERS/Akhtar Soomro

A Qantas plane approaches Kingsford Smith International Airport amidst the easing of the coronavirus disease (COVID-19) restrictions in Sydney, Australia, May 28, 2020. REUTERS/Loren Elliott

A Qantas plane approaches Kingsford Smith International Airport amidst the easing of the coronavirus disease (COVID-19) restrictions in Sydney, Australia, May 28, 2020. REUTERS/Loren Elliott

A Qantas plane approaches Kingsford Smith International Airport amidst the easing of the coronavirus disease (COVID-19) restrictions in Sydney, Australia, May 28, 2020. REUTERS/Loren Elliott

Traveling nurses Meghan Lindsey and Nekiesha Clark ride the plane train to their connecting flight home wearing a face protective masks at Hartsfield–Jackson Atlanta International Airport in Atlanta, Georgia, U.S., May 16, 2020. Picture taken May 16, 2020. REUTERS/Shannon Stapleton

An Air India Airbus A320 plane is seen at the Boryspil International Airport upon arrival, amid the coronavirus disease (COVID-19) outbreak outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

A SkyUp Boeing 737-800 aircraft (L) and a Ukraine International Airlines Boeing 737-900 plane are seen at the Boryspil International Airport amid the coronavirus disease (COVID-19) outbreak, outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

People light oil lamps and candles for the victims of the Pakistan International Airlines's PK8303 plane crash, in Karachi, Pakistan May 27, 2020. REUTERS/Akhtar Soomro

People light oil lamps and candles for the victims of the Pakistan International Airlines's PK8303 plane crash, in Karachi, Pakistan May 27, 2020. REUTERS/Akhtar Soomro

A person walks outside a Boeing 737-800 plane of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

Top officials and a pilot of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, stand next to an aircraft at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

An aircraft of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, is seen at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

A pilot's hat and a protective face mask are seen inside a Boeing 737-800 plane of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

Yevhen Khainatsky, Director General of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, poses for a picture inside a Boeing 737-800 plane at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

An aircraft of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, is seen at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

An aircraft of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, is seen at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich

Oleh Popovych, a pilot of Ukrainian low-cost airline SkyUp which converted most of its passenger planes to carry cargo amid the coronavirus disease (COVID-19) outbreak, is seen in the cockpit of the Boeing 737-800 plane at the Boryspil International Airport outside Kiev, Ukraine May 26, 2020. Picture taken May 26, 2020. REUTERS/Gleb Garanich