Engineers and mechanics retrofit the interior of an Airbus A321 passenger plane into a freighter plane at an ST Engineering hangar in Singapore December 2, 2020. REUTERS/Edgar Su

View of the interior of a fully converted Airbus A321 freighter at an ST Engineering hangar in Singapore December 2, 2020. REUTERS/Edgar Su

Engineers and mechanics retrofit an Airbus A321 passenger plane into a freighter plane at an ST Engineering hangar in Singapore December 2, 2020. REUTERS/Edgar Su

Engineers and mechanics retrofit the interior of an Airbus A321 passenger plane into a freighter plane at an ST Engineering hangar in Singapore December 2, 2020. REUTERS/Edgar Su

A fully converted freighter Airbus A321 is pictured at an ST Engineering hangar in Singapore December 2, 2020. REUTERS/Edgar Su

A fully converted Airbus A321 freighter plane is pictured at an ST Engineering hangar in Singapore December 2, 2020. REUTERS/Edgar Su

An IAG Iberia's worker inspects an engine after transforming an Airbus 330 passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

IAG Iberia's workers set up a net to secure packages as they make the final touches after transforming an Airbus 330 passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

An IAG Iberia's workers install a piece in the tail after transforming an Airbus 330 passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

IAG Iberia's workers set up a net to secure packages as they make the final touches after transforming an Airbus 330 passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

An IAG Iberia's worker walks past nets after transforming an Airbus 330 passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

Passengers' seats are seen under an Iberia's Airbus 330 which was transformed from a passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

An IAG Iberia's worker inspects an engine after transformation of an Airbus 330 passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

An IAG Iberia's worker walks past an engine after transformation of an Airbus 330 passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

An Iberia's Airbus 330 plane is seen after being transformed from a passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

An Iberia's Airbus 330 plane is seen after being transformed from a passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

Passengers' seats are seen under an Iberia's Airbus 330 which was transformed from a passenger aircraft into a cargo one to face the drop in flights due to the coronavirus pandemic at Iberia's maintenance hangar in Madrid, Spain, December 4, 2020. Picture taken December 4, 2020. REUTERS/Sergio Perez

A Lufthansa Airbus A 340-300 aircraft is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa Airbus A 340-300 aircraft is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

The cockpit is pictured onboard a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

Workers prepare a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

The cockpit is pictured onboard a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

Workers prepare a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

A Singapore Airlines flight attendant loads his bag in a overhead bin on an Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

Workers prepare a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

James Boyd, VP of Public Relations for Singapore Airlines, helps to prepare an Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

James Boyd, VP of Public Relations for Singapore Airlines, gives an interview aboard an Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

Workers prepare a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

A logo is pictured on a seat of a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

A Singapore Airlines flight attendant boards an Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri REFILE - CORRECTING DESCRIPTION

The cabin is pictured onboard a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri REFILE - CORRECTING DESCRIPTION

A seat is pictured onboard a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri REFILE - CORRECTING DESCRIPTION

A Singapore Airlines flight attendant boards an Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

Workers prepare a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri REFILE - CORRECTING DESCRIPTION

The first class cabin is pictured onboard a Singapore Airlines Airbus A350 at the gate at JFK airport before a scheduled direct flight to Singapore in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

A man photographs a Singapore Airlines Airbus A350 aircraft at the gate at JFK airport in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

A Singapore Airlines Airbus A350 aircraft is pictured at the gate at JFK airport in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

A Singapore Airlines Airbus A350 aircraft is pictured at the gate at JFK airport in the Queens borough of New York City, New York, U.S., November 11, 2020. REUTERS/Carlo Allegri

A China Southern Airlines Airbus A380-800 plane takes off from Sydney Airport in Sydney, Australia, October 28, 2020. REUTERS/Loren Elliott

A Delta Air Lines Airbus A350-900 plane takes off from Sydney Airport in Sydney, Australia, October 28, 2020. REUTERS/Loren Elliott

View of an airBaltic Airbus A220 wing during a "flight to nowhere" over Latvia, October 25, 2020. Latvian travel agency Balt Go organized flight Riga-Riga for those who miss travel and the flying experience. Picture taken October 25, 2020. REUTERS/Janis Laizans

View of an airBaltic Airbus A220 wing during a "flight to nowhere" over Latvia, October 25, 2020. Latvian travel agency Balt Go organized flight Riga-Riga for those who miss travel and the flying experience. Picture taken October 25, 2020. REUTERS/Janis Laizans

Wing of an airBaltic Airbus A220 is seen as a passenger holds a phone during a "flight to nowhere" over Latvia, October 25, 2020. Latvian travel agency Balt Go organized flight Riga-Riga for those who miss travel and the flying experience. Picture taken October 25, 2020. REUTERS/Janis Laizans

A Singapore Airlines Airbus A350-900 plane undergoes maintenance at Changi Airport in Singapore October 24, 2020. REUTERS/Edgar Su

A French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

Photographers work as a French Air Force Airbus A400M performs during the presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

Photographers work as a French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

Photographers work as a French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

A French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

Photographers work as a French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

Photographers work as a French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

Photographers work as a French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes TPX IMAGES OF THE DAY

A French Air Force Airbus A400M performs during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

A view shows a French Air Force Airbus A400M during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

A view shows an French Air Force Airbus A400M during the presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

A view shows a French Air Force Airbus A400M during a presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

A view shows a French Air Force Airbus A400M during the presentation of the French Air and Space Army at the BA 105 Evreux-Fauville Air Force Base, France, October 15, 2020. REUTERS/Gonzalo Fuentes

A French soldier mans a machine gun in the door of an Airbus Helicopters H225M Caracal during a live mobility demonstration to present the France's military capabilities in Versailles, near Paris, France, October 8, 2020. REUTERS/Benoit Tessier

French soldiers board on an Airbus Helicopters H225M Caracal during a live mobility demonstration to present the France's military capabilities in Versailles, near Paris, France, October 8, 2020. REUTERS/Benoit Tessier

A French soldier fast ropes from an Airbus Helicopters H225M Caracal during a live mobility demonstration to present the France's military capabilities in Versailles, near Paris, France, October 8, 2020. REUTERS/Benoit Tessier