The ELU, a remote-controlled robot that can extract water from the air, invented by Mahmoud El-Komy, a 27-year-old Egyptian mechatronics engineer, is seen in Borg Al Arab desert, Alexandria, Egypt September 1, 2021. El-Komy says the robot is able to condense moisture from humidity and would have the ability to work in environments that are more difficult than Earth's, such as during space flights or even on Mars. Picture taken September 1, 2021. REUTERS/Mohamed Abd El Ghany 

The ELU, a remote-controlled robot that can extract water from the air, invented by Mahmoud El-Komy, a 27-year-old Egyptian mechatronics engineer, is pictured in Borg Al Arab desert, Alexandria, Egypt September 1, 2021. El-Komy says the robot is able to condense moisture from humidity and would have the ability to work in environments that are more difficult than Earth's, such as during space flights or even on Mars. Picture taken September 1, 2021. REUTERS/Mohamed Abd El Ghany 

A man drinks the water produced from ELU, a remote-controlled robot that can extract water from the air, invented by Mahmoud El-Komy, a 27-year-old Egyptian mechatronics engineer, in Borg Al Arab desert, Alexandria, Egypt September 1, 2021. El-Komy says the robot is able to condense moisture from humidity and would have the ability to work in environments that are more difficult than Earth's, such as during space flights or even on Mars. Picture taken September 1, 2021. REUTERS/Mohamed Abd El Ghany 

Mahmoud El-Komy, a 27-year-old Egyptian mechatronics engineer, stands beside ELU, a remote-controlled robot that can extract water from the air, in Borg Al Arab desert, Alexandria, Egypt September 1, 2021. El-Komy says the robot is able to condense moisture from humidity and would have the ability to work in environments that are more difficult than Earth's, such as during space flights or even on Mars. Picture taken September 1, 2021. REUTERS/Mohamed Abd El Ghany TPX IMAGES OF THE DAY 

Mahmoud El-Komy, a 27-year-old Egyptian mechatronics engineer, stands beside ELU, a remote-controlled robot that can extract water from the air, in Borg Al Arab desert, Alexandria, Egypt September 1, 2021. El-Komy says the robot is able to condense moisture from humidity and would have the ability to work in environments that are more difficult than Earth's, such as during space flights or even on Mars. Picture taken September 1, 2021. REUTERS/Mohamed Abd El Ghany 

Mahmoud El-Komy, a 27-year-old Egyptian mechatronics engineer, stands beside ELU, a remote-controlled robot that can extract water from the air, in Borg Al Arab desert, Alexandria, Egypt September 1, 2021. El-Komy says the robot is able to condense moisture from humidity and would have the ability to work in environments that are more difficult than Earth, such as during space flights or even on Mars. Picture taken September 1, 2021. REUTERS/Mohamed Abd El Ghany 

UPDATE Update with flight paths for 17-25 A look at some of the military and civilian aircraft operating out of Kabul airport since the Taliban took control of the capital. 

Albanian Special Police officers stand in front of the tower of Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Passengers wait at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Passengers wait at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Passengers wait at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Albanian Special Police officers stand in front of the tower of Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Passengers wait at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

A passenger walks at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Passengers wait at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

A passenger walks at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Passengers wait at Tirana International Airport "Mother Theresa" after all flights were cancelled due to a strike by air traffic controllers, in Tirana, Albania, April 8, 2021. REUTERS/Florion Goga 

Xie Jianfeng, chief engineer of Beijing Aerospace Flight Control Center, attends a news conference in Beijing, China, December 17, 2020. REUTERS/Thomas Peter 

Li Chunlai, National Space Administration's deputy chief designer of phase III of the lunar exploration project, Yang Baohua, deputy general manager of China Aerospace Science and Technology Corporation, Wu Yanhua, deputy director of the National Space Administration and deputy chief commander of the lunar exploration project, Hu Hao, National Space Administration's chief designer of phase III of the lunar exploration project, Xu Hongliang, spokesman of the National Space Administration, and Xie Jianfeng, chief engineer of Beijing Aerospace Flight Control Center, hold a news conference in Beijing, China, December 17, 2020. REUTERS/Thomas Peter 

General view of an empty passport control counter in Terminal A, after the last flight took off from Berlin's Tegel airport, which closes permanently following the recent opening of the new Berlin-Brandenburg (BER) airport in Berlin, Germany, November 8, 2020. REUTERS/Annegret Hilse 

An empty luggage cart is seen at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

A passenger walks out of the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

A passenger pushes a luggage cart at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

Passengers are seen at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

Passengers are seen at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

People carry luggage at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

A passenger waits at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

Passengers are seen at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

A passenger uses a cellphone at the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

A passenger makes a change to his ticket in the El Alto airport as flight controllers start a strike for non-payment of their wages, in El Alto, outskirts of La Paz, Bolivia, October 21, 2020. REUTERS/David Mercado 

Police try to control the crowd as stranded Bangladeshi workers gather outside of the Biman Bangladesh Airlines office, demanding flight tickets to go back to Saudi Arabia, in Dhaka, Bangladesh, September 24, 2020. REUTERS/Mohammad Ponir Hossain 

Police try to control the crowd as stranded Bangladeshi workers gatheroutside of the Biman Bangladesh Airlines office, demanding flight tickets to go back to Saudi Arabia, in Dhaka, Bangladesh, September 24, 2020. REUTERS/Mohammad Ponir Hossain 

A worker walks beneath electronic flight schedules boards at Cape Town International Airport, run by state-controlled airports company ACSA, during the coronavirus disease (COVID-19) outbreak in Cape Town, South Africa, July 7, 2020. Picture taken July 7, 2020. REUTERS/Mike Hutchings 

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 

Passengers wearing protective face masks line up for the passport control at Sabiha Gokcen Airport during the first day of resumed international flights that were halted amid the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey June 11, 2020. REUTERS/Murad Sezer 

Passengers wearing protective face masks line up for the passport control at Sabiha Gokcen Airport during the first day of resumed international flights that were halted amid the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey June 11, 2020. REUTERS/Murad Sezer 

A security employee wearing a thermal imaging VF helmet monitors passengers before they line up for the passport control at Sabiha Gokcen Airport during the first day of resumed international flights that were halted amid the spread of the coronavirus disease (COVID-19), in Istanbul, Turkey June 11, 2020. REUTERS/Murad Sezer 

Karin Wasowski (R), controller at German car manufacturer Volkswagen AG is hugged by a friend before she boards the first Lufthansa charter flight for Tianjin, China, after the lockdown, as the spread of the coronavirus disease (COVID-19) continues, at the airport in Frankfurt, Germany, May 29, 2020. REUTERS/Kai Pfaffenbach 

Karin Wasowski (R), controller at German car manufacturer Volkswagen AG talks to the media before she boards the first Lufthansa charter flight for Tianjin, after the lock down at the airport as the spread of the coronavirus disease (COVID-19) continues. in Frankfurt, Germany, May 29, 2020. REUTERS/Kai Pfaffenbach 

A British airways aeroplane tailfin and a Virgin Atlantic areoplane are seen with the control tower at Heathrow airport. Virgin Atlantic said on Tuesday it planned to cut 3,150 jobs and would move its flying programme from London Gatwick to Heathrow airport following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 5, 2020. REUTERS/Toby Melville 

A British airways aeroplane tailfin and a Virgin Atlantic areoplane are seen with the control tower at Heathrow airport. Virgin Atlantic said on Tuesday it planned to cut 3,150 jobs and would move its flying programme from London Gatwick to Heathrow airport following the outbreak of the coronavirus disease (COVID-19), London, Britain, May 5, 2020. REUTERS/Toby Melville 

A passenger wearing a mask waits in line to check in for a flight as the Federal Aviation Administration (FAA) said it temporarily halted flights arriving at New York City airports and Philadelphia on Saturday after a trainee at the New York Air Route Traffic Control Center tested positive for coronavirus disease (COVID-19), at Miami International Airport, Miami, Florida, U.S., March 21, 2020. REUTERS/Carlos Barria 

A passenger wearing a mask sits next to an airpot information screens as the Federal Aviation Administration (FAA) said it temporarily halted flights arriving at New York City airports and Philadelphia on Saturday after a trainee at the New York Air Route Traffic Control Center tested positive for coronavirus disease (COVID-19), at Miami International Airport, Miami, Florida, U.S., March 21, 2020. REUTERS/Carlos Barria 

ON THIS DAY -- March 20 March 20, 1999: BALLOONING - British balloonist Alan Noble, flight director of the Breitling Orbiter 3, cracked open a bottle of champagne at the balloon's flight control centre in Geneva, and compatriot Brian Jones and Swiss Bertrand Piccard became the first men ever to fly round the world non-stop in a hot air balloon. The pair crossed the 9 degree 27 minute west line of longitude over Mauretania exactly 20 days after taking off from Switzerland. The triumph marked an 18-year battle to achieve the feat for Noble, who took up ballooning in 1974. As flight director, Noble helped the balloonists avoid trouble spots and find air currents. Noble has played a part in many balloon record attempts, working on a number of altitude records. "I find it challenging and extremely exciting indeed," Noble told local media after one unsuccessful altitude attempt. "Contrary to popular belief, a balloon can be controlled to a big extent and doesn't just drift around in the sky." REUTERS/Denis Balibouse 

British tourists cross the border to enter Gibraltar as they leave Spain to take a flight before an order from the Spanish government to set up controls at its land borders over coronavirus, in La Linea de la Concepcion, southern Spain March 16, 2020. REUTERS/Jon Nazca 

Passengers, who arrived from China on the last planned Ukrainian flight before a ban over coronavirus, gather near a passport control point at the Boryspil International Airport outside Kiev, Ukraine February 4, 2020. REUTERS/Valentyn Ogirenko 

An officer of the Ukrainian State Border Guard Service wearing a protective mask walks near passengers, who gather at a passport control point upon their arrival from China on the last planned Ukrainian flight before a ban over coronavirus, at the Boryspil International Airport outside Kiev, Ukraine February 4, 2020. REUTERS/Valentyn Ogirenko 

Travellers wearing masks arrive on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

A traveller wearing a mask arrives on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

A traveller wearing a mask arrives on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

A traveller wearing a mask arrives on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

A traveller wearing a mask arrives on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

Travellers wearing masks arrive on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

A traveller wearing a mask arrives on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

A traveller wearing a mask arrives on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

Travellers wearing masks arrive on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder TPX IMAGES OF THE DAY 

Travellers wearing masks arrive on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

Travellers wearing masks arrive on a direct flight from China, after a spokesman from the U.S. Centers for Disease Control and Prevention (CDC) said a traveller from China had been the first person in the United States to be diagnosed with the Wuhan coronavirus, at Seattle-Tacoma International Airport in SeaTac, Washington, U.S. January 23, 2020. REUTERS/David Ryder 

An air traffic controller looks at a map of flights above the country in the control tower at Sarajevo airport in Sarajevo, Bosnia and Herzegovina December 4, 2019. REUTERS/Dado Ruvic