A passenger pushes his luggage as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Social distance signage is seen while passengers queue at the baggage drop-off section as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Passengers queue at the check-in counter as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya, August 1, 2020. REUTERS/Njeri Mwangi

A passenger walks along the social distance signage as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A passenger is served at the check-in counter as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A relative bids farewell to passengers as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A relative outside the terminal and a passenger use mobile phones as they talk near the glass door as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A security dog is seen near a social distance sign as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A Kenya Airways worker is seen as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Passengers sit on waiting chairs marked with the social distance signage as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Kenya Airways CEO Allan Kilavuka addresses delegates as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A health worker looks on while passengers walk through a screening station as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Kenya Airways planes are seen through a window as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Passengers walk in formation as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A Kenya Airways plane is received by a water salute as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Airport workers are seen near a travel schedule display monitor as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Passengers are seen at the Passport control section as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

A passenger pushes his luggage trolley at the check-in counter as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

Passengers arrive at the check-in counters as the Jomo Kenyatta international airport reopens after flights were suspended following the coronavirus disease (COVID-19) outbreak in Nairobi, Kenya August 1, 2020. REUTERS/Njeri Mwangi

U.S. President Donald Trump gestures as he boards Air Force One for a flight to Joint Base Andrews in Maryland, at Morristown Municipal Airport, in Morristown, U.S., July 26, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump gestures as he walks to Air Force One ahead of a flight to Joint Base Andrews in Maryland, at Morristown Municipal Airport, in Morristown, U.S., July 26, 2020. REUTERS/Tom Brenner REFILE - CLARIFYING INFORMATION

U.S. President Donald Trump walks to Air Force One ahead of a flight to Joint Base Andrews in Maryland, at Morristown Municipal Airport, in Morristown, U.S., July 26, 2020. REUTERS/Tom Brenner REFILE - CLARIFYING INFORMATION

White House senior adviser Jared Kushner, speaks to White House Social Media Director Dan Scavino, while walking towards Air Force One ahead of a flight, at Joint Base Andrews in Maryland, U.S., July 24, 2020. Picture taken July 24, 2020. REUTERS/Tom Brenner

White House senior adviser Jared Kushner, walks beside White House Social Media Director Dan Scavino, towards Air Force One ahead of a flight, at Joint Base Andrews in Maryland, U.S., July 24, 2020. Picture taken July 24, 2020. REUTERS/Tom Brenner

With U.S. President Donald Trump aboard, Marine One and a duplicate helicopter descend onto the tarmac ahead of a flight, at Joint Base Andrews in Maryland, U.S., July 24, 2020. Picture taken July 24, 2020. REUTERS/Tom Brenner

U.S. President Trump walks from Air Force One to Marine One following a flight from Maryland, at Morristown Municipal Airport in Morristown, NJ, U.S., July 24, 2020. Picture taken July 24, 2020. REUTERS/Tom Brenner TPX IMAGES OF THE DAY

U.S. President Trump walks from Air Force One to Marine One following a flight from Maryland, at Morristown Municipal Airport in Morristown, NJ, U.S., July 24, 2020. Picture taken July 24, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump walks from Marine One to Air Force One ahead of a flight, at Joint Base Andrews in Maryland, U.S., July 24, 2020. Picture taken July 24, 2020. REUTERS/Tom Brenner

Britain's Prime Minister Boris Johnson speaks with Flight Lieutenant Will Randle at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

Britain's Prime Minister Boris Johnson greets Flight Lieutenant Will Randle with an elbow bump at RAF Lossiemouth, during a visit to the Highlands and Northern Isles of Scotland, in Moray, Scotland, Britain July 23, 2020. Andrew Milligan/Pool via REUTERS

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as she checks the papers with Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 13, 2020. Picture taken July 13, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as she takes a swab sample of Nicholas Couvaras' wife, as Dubai resumes flights, in Dubai, United Arab Emirates July 13, 2020. Picture taken July 13, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as he checks a passport of Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 14, 2020. Picture taken July 14, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as he checks the luggage of Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 14, 2020. Picture taken July 14, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, checks the luggage of Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 14, 2020. Picture taken July 14, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as she takes a swab sample of Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 13, 2020. Picture taken July 13, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as he carries the luggage of Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 14, 2020. Picture taken July 14, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as he disinfects the luggage of Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 14, 2020. Picture taken July 14, 2020. REUTERS/Ahmed Jadallah

A worker of a company, which is offering testing for the coronavirus disease (COVID-19) and check-in for travellers at their homes, wears a protective mask as he carries the luggage of Nicholas Couvaras, as Dubai resumes flights, in Dubai, United Arab Emirates July 14, 2020. Picture taken July 14, 2020. REUTERS/Ahmed Jadallah

A worker wearing a protective mask talks on the phone after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier al-Sudani

Passengers wearing protective masks check-in after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier Al-Sudani

Passengers wearing protective masks check-in after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier Al-Sudani

Passengers wearing protective masks sit at the departure hall after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier Al-Sudani

Passengers wearing protective masks line up to check-in after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier Al-Sudani

Passengers wearing protective masks are seen after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier al-Sudani

A passenger wearing a protective mask sits at the departure hall after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier Al-Sudani

Airport security checks luggages after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier al-Sudani

Passengers arrive to Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, after it's reopening, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier Al-Sudani

Passengers wearing protective masks queue for check-in at the departure hall after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier al-Sudani

A passenger wearing a protective mask checks-in after the reopening of Baghdad International Airport, where flights halted due to the coronavirus disease (COVID-19) outbreak, in Baghdad, Iraq July 23, 2020. REUTERS/Thaier Al-Sudani

Travellers wearing face masks following the coronavirus disease (COVID-19) outbreak wait for their flights at the Beijing Capital International Airport in Beijing, China July 22, 2020. REUTERS/Carlos Garcia Rawlins

A passenger walks toward the airbridge as another walks up to use biometric boarding for an international flight United Airlines flight at IAH George Bush Intercontinental Airport amid the coronavirus disease (COVID-19) outbreak in Houston, Texas, U.S., July 21, 2020. REUTERS/Adrees Latif

A passenger is confirmed to board as he uses biometric boarding for an international flight from IAH George Bush Intercontinental Airport amid the coronavirus disease (COVID-19) outbreak in Houston, Texas, U.S., July 21, 2020. REUTERS/Adrees Latif

A female passenger uses biometric boarding for an international flight from IAH George Bush Intercontinental Airport amid the coronavirus disease (COVID-19) outbreak in Houston, Texas, U.S., July 21, 2020. REUTERS/Adrees Latif

A man checks in for a flight at IAH George Bush Intercontinental Airport amid the coronavirus disease (COVID-19) outbreak in Houston, Texas, U.S., July 21, 2020. REUTERS/Adrees Latif

A passenger self scans her boarding pass to enter a United Airlines flight at IAH George Bush Intercontinental Airport amid the coronavirus disease (COVID-19) outbreak in Houston, Texas, U.S., July 21, 2020. REUTERS/Adrees Latif

Passengers check in for a United Airlines flight at IAH George Bush Intercontinental Airport amid the coronavirus disease (COVID-19) outbreak in Houston, Texas, U.S., July 21, 2020. REUTERS/Adrees Latif

A United Airlines employee helps a passenger position himself as he uses biometric boarding to board an international flight from IAH George Bush Intercontinental Airport amid the coronavirus disease (COVID-19) outbreak in Houston, Texas, U.S., July 21, 2020. REUTERS/Adrees Latif

Members of the self-proclaimed Donetsk People's Republic forces walk past a memorial to victims of Malaysia Airlines Flight MH17 plane crash, that was shot down over rebel-held territory in 2014, on the anniversary of the incident, outside the village of Hrabove in Donetsk region, Ukraine July 17, 2020. REUTERS/Alexander Ermochenko

Members of the Organization for Security and Co-operation in Europe (OSCE) drive past a cross near the crash site of Malaysia Airlines Flight MH17 plane, that was shot down over rebel-held territory in 2014, on the anniversary of the incident, outside the village of Hrabove in Donetsk region, Ukraine July 17, 2020. A sign on the cross reads "Save and Protect. Hrabove". REUTERS/Alexander Ermochenko