The Lufthansa logo is pictured at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

A sign leads the way towards a COVID-19 test centre at Frankfurt Airport after the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

A flight passenger walks past a Lufthansa ticket counter at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

A Lufthansa ticket counter is pictured at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

A flight passenger walks past a Lufthansa ticket counter at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

The Lufthansa logo is pictured at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

The Lufthansa logo is pictured at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

A Lufthansa ticket counter is pictured at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

An empty Lufthansa ticket counter is pictured at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

The Lufthansa logo is pictured at Frankfurt Airport in Frankfurt, Germany, September 21, 2020. REUTERS/Ralph Orlowski

Airplanes of German carrier Lufthansa stand on the tarmac at Munich International Airport, Germany, August 4, 2020. REUTERS/Michael Dalder

An Airplane of German carrier Lufthansa takes off from Munich International Airport, Germany, August 4, 2020. REUTERS/Michael Dalder

An Airplane of German carrier Lufthansa takes off from Munich International Airport, Germany, August 4, 2020. REUTERS/Michael Dalder

An Airplane of German carrier Lufthansa takes off from Munich International Airport, Germany, August 4, 2020. REUTERS/Michael Dalder

Airplanes of German carrier Lufthansa stand on the tarmac at Munich International Airport, Germany, August 4, 2020. REUTERS/Michael Dalder

Airplanes of German carrier Lufthansa stand on the tarmac at Munich International Airport, Germany, August 4, 2020. REUTERS/Michael Dalder

Airplanes of German carrier Lufthansa stand on the tarmac at Munich International Airport, Germany, August 4, 2020. REUTERS/Michael Dalder

Airplanes of the German air carrier Lufthansa are seen inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

A technician of the German air carrier Lufthansa works on an A-340 airplane to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

A technician of the German air carrier Lufthansa works on an A-340 airplane to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

An A-340 airplane of the German air carrier Lufthansa is seen inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

An A-340 airplane of the German air carrier Lufthansa is seen inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

An airplane of the German air carrier Lufthansa is pulled inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

Airplanes of the German air carrier Lufthansa are seen outside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

Airplanes of the German air carrier Lufthansa are seen outside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

Spare tires for planes of the German air carrier Lufthansa are seen inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

A partly dismantled tail of a plane of the German air carrier Lufthansa is seen outside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

A technician of the German air carrier Lufthansa works on an A-340 airplane to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

A technician of the German air carrier Lufthansa works on an A-340 airplane to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

An airplane of the German air carrier Lufthansa is pulled inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

An airplane of the German air carrier Lufthansa is pulled inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for a month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

An A-340 airplane of the German air carrier Lufthansa is seen inside a hangar for technical check-up to ensure planes keep up their safety standards despite being grounded for month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

A technician of the German air carrier Lufthansa works on an A-340 airplane to ensure planes keep up their safety standards despite being grounded for month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

A technician of the German air carrier Lufthansa works on an A-340 airplane to ensure planes keep up their safety standards despite being grounded for month due to the outbreak of the coronavirus disease (COVID-19) in Frankfurt, Germany, July 30, 2020. REUTERS/Kai Pfaffenbach

German airline industry workers wearing protective face masks protest in front of the Chancellery against job cuts, following the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, July 2, 2020. The placard reads: ''We are also Lufthansa!''. REUTERS/Fabrizio Bensch

A flight crew member of an aircraft of Lufthansa's unit Austrian Airlines waves the U.S. flag ahead of take off to New York at the Vienna International Airport in Schwechat, Austria July 1, 2020. REUTERS/Lisi Niesner

Julian Jaeger, Member of the Management Board of Vienna International Airport and Andreas Otto, Member of the Management Board of Austrian Airlines stand in front of an aircraft of Lufthansa's unit Austrian Airlines ahead of take off to New York at the Vienna International Airport in Schwechat, Austria July 1, 2020. REUTERS/Lisi Niesner

A flight crew member of an aircraft of Lufthansa's unit Austrian Airlines is seen ahead of take off to New York at the Vienna International Airport in Schwechat, Austria July 1, 2020. REUTERS/Lisi Niesner

A flight crew member of an aircraft of Lufthansa's unit Austrian Airlines holds the U.S. flag ahead of take off to New York at the Vienna International Airport in Schwechat, Austria July 1, 2020. REUTERS/Lisi Niesner

Flight crew members of an aircraft of Lufthansa's unit Austrian Airlines hold the U.S. flags ahead of take off to New York at the Vienna International Airport in Schwechat, Austria July 1, 2020. REUTERS/Lisi Niesner

A worker checks an aircraft of Lufthansa's unit Austrian Airlines ahead of take off to New York at the Vienna International Airport in Schwechat, Austria July 1, 2020. REUTERS/Lisi Niesner

Flight crew members of an aircraft of Lufthansa's unit Austrian Airlines are pictured ahead of take off to New York at the Vienna International Airport in Schwechat, Austria July 1, 2020. REUTERS/Lisi Niesner

Employees of the diagnostics provider Centogene are seen inside a container housing their mobile laboratory at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany June 29, 2020. REUTERS/Kai Pfaffenbach

Employees of the diagnostics provider Centogene work inside a container housing their mobile laboratory at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany, June 29, 2020. REUTERS/Kai Pfaffenbach

Travellers rush past the entry of Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened by diagnostics provider Centogene in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany June 29, 2020. REUTERS/Kai Pfaffenbach

A medic waits for a traveller at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened by diagnostics provider Centogene in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany June 29, 2020. REUTERS/Kai Pfaffenbach

A saliva sample is registered at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened by diagnostics provider Centogene in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany June 29, 2020. REUTERS/Kai Pfaffenbach

An employee of the diagnostics provider Centogene works inside a container housing their mobile laboratory at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany June 29, 2020. REUTERS/Kai Pfaffenbach

A saliva sample is taken at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened by diagnostics provider Centogene in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany June 29, 2020. REUTERS/Kai Pfaffenbach

A saliva sample is taken at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened by diagnostics provider Centogene in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, German June 29, 2020. REUTERS/Kai Pfaffenbach

A medic waits for a traveller at Germany's first walk-through the coronavirus disease (COVID-19) test center which is opened by diagnostics provider Centogene in cooperation with air carrier Lufthansa and Fraport at the airport in Frankfurt, Germany June 29, 2020. REUTERS/Kai Pfaffenbach

A Lufthansa Boeing 747 sits on the tarmac at French aircraft storage and recycling company Tarmac Aerosave in Tarbes following the coronavirus disease (COVID-19) outbreak in France, June 19, 2020. Picture taken June 19, 2020. REUTERS/Stephane Mahe

Employees work on a Lufthansa Boeing 747 at French aircraft storage and recycling company Tarmac Aerosave in Tarbes following the coronavirus disease (COVID-19) outbreak in France, June 19, 2020. Picture taken June 19, 2020. REUTERS/Stephane Mahe

A Lufthansa Boeing 747 sits on the tarmac at the site of French aircraft storage and recycling company Tarmac Aerosave in Tarbes following the coronavirus disease (COVID-19) outbreak in France, June 19, 2020. Picture taken June 19, 2020. REUTERS/Stephane Mahe

Airplanes of German carrier Lufthansa are parked at the Berlin Schoenefeld airport, amid the spread of the coronavirus disease (COVID-19) outbreak in Schoenefeld, Germany, June 25, 2020. REUTERS/Fabrizio Bensch

Airplanes of German carrier Lufthansa are parked at the Berlin Schoenefeld airport, amid the spread of the coronavirus disease (COVID-19) outbreak in Schoenefeld, Germany, June 25, 2020. REUTERS/Fabrizio Bensch

Employees of Lufthansa attend a protest against planned job cuts of Germany's flagship carrier hit hard by the coronavirus (COVID-19)-induced travel slump during a demonstration of pilots union Cockpit at the Lufthansa Aviation Center in Frankfurt, Germany June 25, 2020. REUTERS/Kai Pfaffenbach

Employees of Lufthansa attend a protest against planned job cuts of Germany's flagship carrier hit hard by the coronavirus (COVID-19)-induced travel slump during a demonstration of pilots union Cockpit at the Lufthansa Aviation Center in Frankfurt, Germany June 25, 2020. REUTERS/Kai Pfaffenbach

An employee of Lufthansa wears a protective face mask as she attends a protest against planned job cuts of Germany's flagship carrier hit hard by the coronavirus (COVID-19)-induced travel slump during a demonstration of pilots union Cockpit at the Lufthansa Aviation Center in Frankfurt, Germany June 25, 2020. REUTERS/Kai Pfaffenbach

An employee of Lufthansa attends a protest against planned job cuts of Germany's flagship carrier hit hard by the coronavirus (COVID-19)-induced travel slump during a demonstration of pilots union Cockpit at the Lufthansa Aviation Center in Frankfurt, Germany June 25, 2020. The text reads: "Hope gives wings". REUTERS/Kai Pfaffenbach