U.S. first lady Jill Biden makes her way to board a flight before departing from Andrews Air Force Base in Maryland, U.S. March 3, 2021. Mandel Ngan/Pool via REUTERS

U.S. first lady Jill Biden makes her way to board a flight before departing from Andrews Air Force Base in Maryland, U.S. March 3, 2021. Mandel Ngan/Pool via REUTERS

U.S. first lady Jill Biden makes her way to board a flight before departing from Andrews Air Force Base in Maryland, U.S. March 3, 2021. Mandel Ngan/Pool via REUTERS

U.S. first lady Jill Biden makes her way to board a flight before departing from Andrews Air Force Base in Maryland, U.S. March 3, 2021. Mandel Ngan/Pool via REUTERS

U.S. first lady Jill Biden makes her way to board a flight before departing from Andrews Air Force Base in Maryland, U.S. March 3, 2021. Mandel Ngan/Pool via REUTERS

U.S. first lady Jill Biden makes her way to board a flight before departing from Andrews Air Force Base in Maryland, U.S. March 3, 2021. Mandel Ngan/Pool via REUTERS

Soccer Football - Ligue 1 - Lille v RC Strasbourg - Stade Pierre-Mauroy, Lille, France - February 28, 2021 Pigeons in flight past the assistant referee during the match REUTERS/Pascal Rossignol

Soccer Football - Ligue 1 - Lille v RC Strasbourg - Stade Pierre-Mauroy, Lille, France - February 28, 2021 General view of pigeons in flight during the match REUTERS/Pascal Rossignol

Travellers from an international flight line up to board a shuttle which will take them to a quarantine hotel, as part of Canada's new measures against the coronavirus disease (COVID-19), at Toronto Pearson International Airport in Mississauga, Ontario, Canada February 24, 2021. REUTERS/Carlos Osorio

Travellers from an international flight are directed to the COVID-19 testing area as part of Canada's new measures against the coronavirus disease (COVID-19), at Toronto Pearson International Airport in Mississauga, Ontario, Canada February 24, 2021. REUTERS/Carlos Osorio

A Cathay Pacific flight attendant prepares to receive China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

Snow falls at the United Parcel Service (UPS) WorldPort hub located at Louisville Muhammad Ali International Airport in Louisville, Kentucky, U.S., February 15, 2021. For the first time in history, UPS has closed the WorldPort hub, suspending all sorting and flight operations because of weather. REUTERS/Bryan Woolston

Snow falls at the United Parcel Service (UPS) WorldPort hub located at Louisville Muhammad Ali International Airport in Louisville, Kentucky, U.S., February 15, 2021. For the first time in history, UPS has closed the WorldPort hub, suspending all sorting and flight operations because of weather. REUTERS/Bryan Woolston

Snow falls at the United Parcel Service (UPS) WorldPort hub located at Louisville Muhammad Ali International Airport in Louisville, Kentucky, U.S., February 15, 2021. For the first time in history, UPS has closed the WorldPort hub, suspending all sorting and flight operations because of weather. REUTERS/Bryan Woolston TPX IMAGES OF THE DAY

Snow falls at the United Parcel Service (UPS) WorldPort hub located at Louisville Muhammad Ali International Airport in Louisville, Kentucky, U.S., February 15, 2021. For the first time in history, UPS has closed the WorldPort hub, suspending all sorting and flight operations because of weather. REUTERS/Bryan Woolston

Snow falls at the United Parcel Service (UPS) WorldPort hub located at Louisville Muhammad Ali International Airport in Louisville, Kentucky, U.S., February 15, 2021. For the first time in history, UPS has closed the WorldPort hub, suspending all sorting and flight operations because of weather. REUTERS/Bryan Woolston

A box containing tests for coronavirus disease (COVID-19) is transported by a drone on a test flight from the Hermes Pardini Group laboratory to the Orizonti Institute in Belo Horizonte, Brazil, February 11, 2021. REUTERS/Washington Alves

A box containing tests for coronavirus disease (COVID-19) is transported by a drone on a test flight from the Hermes Pardini Group laboratory to the Orizonti Institute in Belo Horizonte, Brazil, February 11, 2021. REUTERS/Washington Alves

A box containing tests for coronavirus disease (COVID-19) is transported by a drone on a test flight from the Hermes Pardini Group laboratory to the Orizonti Institute in Belo Horizonte, Brazil, February 11, 2021. REUTERS/Washington Alves

A box containing tests for coronavirus disease (COVID-19) is transported by a drone on a test flight from the Hermes Pardini Group laboratory to the Orizonti Institute in Belo Horizonte, Brazil, February 11, 2021. REUTERS/Washington Alves

A box containing tests for coronavirus disease (COVID-19) is transported by a drone on a test flight from the Hermes Pardini Group laboratory to the Orizonti Institute in Belo Horizonte, Brazil, February 11, 2021. REUTERS/Washington Alves

The SpaceX Starship SN9 explodes into a fireball after its high altitude test flight from test facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins TPX IMAGES OF THE DAY

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX Starship SN9 explodes into a fireball after its high altitude test flight from test facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX Starship SN9 explodes into a fireball after its high altitude test flight from test facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX Starship SN9 explodes into a fireball after its high altitude test flight from test facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX Starship SN9 explodes into a fireball after its high altitude test flight from test facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

The SpaceX launches Starship SN9 for a test flight from its facilities in Boca Chica, Texas, U.S. February 2, 2021. REUTERS/Gene Blevins

SpaceX starships SN9(L) and SN10 continue to wait for test flights as the sun sets at the launch facilities in Boca Chica, Texas, February 1, 2021. REUTERS/Gene Blevins

SpaceX starships SN9(L) and SN10 continue to wait for test flights as the sun sets at the launch facilities in Boca Chica, Texas, February 1, 2021. REUTERS/Gene Blevins

Federal police officers walk through Frankfurt Airport, as the spread of the coronavirus disease (COVID-19) continues, in Frankfurt, Germany, January 30, 2021. REUTERS/Ralph Orlowski

A federal police officer checks an air passenger arriving from Britain at Frankfurt Airport, as the spread of the coronavirus disease (COVID-19) continues, in Frankfurt, Germany, January 30, 2021. REUTERS/Ralph Orlowski

Federal police officers check air passengers arriving from Britain at Frankfurt Airport, as the spread of the coronavirus disease (COVID-19) continues, in Frankfurt, Germany, January 30, 2021. REUTERS/Ralph Orlowski

Federal police officers check air passengers arriving from Britain at Frankfurt Airport, as the spread of the coronavirus disease (COVID-19) continues, in Frankfurt, Germany, January 30, 2021. REUTERS/Ralph Orlowski

Federal police officers check air passengers arriving from Britain at Frankfurt Airport, as the spread of the coronavirus disease (COVID-19) continues, in Frankfurt, Germany, January 30, 2021. REUTERS/Ralph Orlowski

Federal police officers check an air passenger arriving from Britain at the Frankfurt Airport, as the spread of the coronavirus disease (COVID-19) continues, in Frankfurt, Germany, January 30, 2021. REUTERS/Ralph Orlowski

Two pilots discuss flight plans before a mission at an Air Force base in Tainan, Taiwan, January 26, 2021. REUTERS/Ann Wang

Chart of calendar days on which Chinese flights made incursions into Taiwanese air space.

Passengers walk inside a terminal at Ben Gurion international airport before Israel bans international flights, taking effect from Monday midnight until the end of January, in order to stop the spread of the coronavirus disease (COVID-19) and new coronavirus strains, in Lod near Tel Aviv, Israel January 25, 2021. REUTERS/Ronen Zvulun

A passenger looks at the information monitor inside a terminal at Ben Gurion international airport before Israel bans international flights, taking effect from Monday midnight until the end of January, in order to stop the spread of the coronavirus disease (COVID-19) and new coronavirus strains, in Lod near Tel Aviv, Israel January 25, 2021. REUTERS/Ronen Zvulun

A passenger walks inside a terminal at Ben Gurion international airport before Israel bans international flights, taking effect from Monday midnight until the end of January, in order to stop the spread of the coronavirus disease (COVID-19) and new coronavirus strains, in Lod near Tel Aviv, Israel January 25, 2021. REUTERS/Ronen Zvulun

Passengers walk inside a terminal at Ben Gurion international airport before Israel bans international flights, taking effect from Monday midnight until the end of January, in order to stop the spread of the coronavirus disease (COVID-19) and new coronavirus strains, in Lod near Tel Aviv, Israel January 25, 2021. REUTERS/Ronen Zvulun

A passenger arrives to a terminal at Ben Gurion international airport before Israel bans international flights, taking effect from Monday midnight until the end of January, in order to stop the spread of the coronavirus disease (COVID-19) and new coronavirus strains, in Lod near Tel Aviv, Israel January 25, 2021. REUTERS/Ronen Zvulun

A passenger arrives to a terminal at Ben Gurion international airport before Israel bans international flights, taking effect from Monday midnight until the end of January, in order to stop the spread of the coronavirus disease (COVID-19) and new coronavirus strains, in Lod near Tel Aviv, Israel January 25, 2021. REUTERS/Ronen Zvulun

A family member of the passenger of Sriwijaya Air flight SJ 182, which crashed into the sea, mourns while visiting the site of the crash to pay their tribute, on the deck of Indonesia's Naval ship KRI Semarang, at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana

A family member of the passenger of Sriwijaya Air flight SJ 182, which crashed into the sea, mourns while visiting the site of the crash to pay their tribute, on the deck of Indonesia's Naval ship KRI Semarang, at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana

Colleagues of the cabin crew of Sriwijaya Air flight SJ 182, which crashed into the sea, stand on the deck of Indonesia's Naval ship KRI Semarang, as they visit the site of the crash to pay their tribute at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana

Flight attendants of Sriwijaya Air react as they visit the site of the crash of Sriwijaya Air flight SJ 182 to pay their tribute, on the deck of Indonesia's Naval ship KRI Semarang at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana TPX IMAGES OF THE DAY

Family members of the passengers of Sriwijaya Air flight SJ 182, which crashed into the sea, mourn as they visit the site of the crash to pay their tribute, on the deck of Indonesia's Naval ship KRI Semarang, at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana

Colleagues of the crew members of Sriwijaya Air flight SJ 182, which crashed into the sea, throw flowers and petals from the deck of Indonesia's Naval ship KRI Semarang as they visit the site of the crash to pay their tribute, at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana

A colleague of the crew of Sriwijaya Air flight SJ 182, which crashed into the sea, throws flowers and petals from the deck of Indonesia's Naval ship KRI Semarang as they visit the site of the crash to pay their tribute, at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana

Family members of the passengers of Sriwijaya Air flight SJ 182, which crashed into the sea, react while throwing flowers and petals from the deck of Indonesia's Naval ship KRI Semarang as they visit the site of the crash to pay their tribute, at the sea off the Jakarta coast, Indonesia, January 22, 2021. REUTERS/Ajeng Dinar Ulfiana