German air carrier Lufthansa's logo is seen near a terminal on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

A passenger follows signs towards German air carrier Lufthansa's service center on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

An emergency exit sign is seen next to closed counters of German air carrier Lufthansa on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

Passengers follow signs towards German air carrier Lufthansa's service center on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

A shut-down first class counter of German air carrier Lufthansa is photographed on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

A shut-down first class counter of German air carrier Lufthansa is photographed on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

A flag of German air carrier Lufthansa flutters in the wind on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

A flag of German air carrier Lufthansa flutters in the wind on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

Passengers come and go to a German air carrier Lufthansa's service center on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

A passenger wears a PPE (personal protection equipment) suit as she walks through the terminal of German air carrier Lufthansa on the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

Planes of German air carrier Lufthansa are photographed at the day of the airline's annual general meeting at the airport in Frankfurt, Germany, May 4, 2021. REUTERS/Kai Pfaffenbach

The Lufthansa Logo is seen during the media tour at the former Berlin Tegel airport during the last day before the end of operation in Berlin, Germany, May 4, 2021. REUTERS/Michele Tantussi

Passengers queue at Lufthansa check-in desk in the Frankfurt airport, amid the outbreak of the coronavirus disease (COVID-19), in Frankfurt, Germany, March 29, 2021. REUTERS/Kai Pfaffenbach

An employee of Lufthansa fills an ultra-low temperature container with dry ice at the Lufthansa pharma hub at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

An employee of Lufthansa fills an ultra-low temperature container with dry ice at the Lufthansa pharma hub at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A forklift drives through the Lufthansa pharma hub at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A forklift drives through the Lufthansa pharma hub at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is refueled at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Jochen Thewes, CEO of DB Schenker AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A tractor drives past a Lufthansa McDonnell Douglas MD-11 cargo aircraft 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

A Lufthansa McDonnell Douglas MD-11 cargo aircraft is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

An employee checks freight at a ramp of 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

A Lufthansa cargo aircraft is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa McDonnell Douglas MD-11 cargo aircraft is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Dorothea von Boxberg, member of the board of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Dorothea von Boxberg, member of the board of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Dorothea von Boxberg, member of the board of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa McDonnell Douglas MD-11 cargo aircraft is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Dorothea von Boxberg, member of the board of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Thorsten Meincke, member of the board of DB Schenker AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Jochen Thewes, CEO of DB Schenker AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Jochen Thewes, CEO of DB Schenker AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is refueled at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG attends the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is loaded at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is refueled at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is loaded at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is loaded at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is refueled at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is refueled at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

Peter Gerber, CEO of Lufthansa Cargo AG and Dorothea von Boxberg, member of the board of Lufthansa Cargo AG attend the presentation of a Lufthansa CO2-neutral Boeing 777 cargo aircraft, operated with sustainable aviation fuel (SAF), at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski

A Lufthansa McDonnell Douglas MD-11 cargo aircraft is pictured at Frankfurt airport, Germany, November 27, 2020. REUTERS/Ralph Orlowski