A Irkut MC-21-310 mid-range jet airliner performs perform during the MAKS 2021 air show in Zhukovsky, outside Moscow, Russia, July 24, 2021. REUTERS/Tatyana Makeyeva

An Ilyushin Il-114-300 airliner performs during the MAKS 2021 air show in Zhukovsky, outside Moscow, Russia, July 24, 2021. REUTERS/Tatyana Makeyeva

A passenger waits for his Emirates Airlines' flight departure to Dubai at Cairo's International Airport, Egypt July 20, 2021. REUTERS/Amr Abdallah Dalsh REFILE - CORRECTING MONTH

Travellers wait for the Qatar Airlines' flight departure to Doha at Cairo's International Airport, Egypt July 20, 2021. REUTERS/Amr Abdallah Dalsh REFILE - CORRECTING MONTH

Irkut MC-21-300 and MC-21-310 mid-range jet airliners perform during an opening of the MAKS 2021 air show in Zhukovsky, outside Moscow, Russia, July 20, 2021. REUTERS/Tatyana Makeyeva

Irkut MC-21-300 and MC-21-310 mid-range jet airliners and a Ilyushin Il-114-300 airliner perform during an opening of the MAKS 2021 air show in Zhukovsky, outside Moscow, Russia, July 20, 2021. REUTERS/Tatyana Makeyeva

An Ilyushin Il-114-300 airliner performs during an opening of the MAKS 2021 air show in Zhukovsky, outside Moscow, Russia, July 20, 2021. REUTERS/Tatyana Makeyeva

Members of Russia's National Guard walk past an Airbus A350-1000 airliner during an opening of the MAKS 2021 air show in Zhukovsky, outside Moscow, Russia, July 20, 2021. REUTERS/Tatyana Makeyeva

A Irkut MC-21-310 mid-range jet airliner performs during an opening of the MAKS 2021 air show in Zhukovsky, outside Moscow, Russia, July 20, 2021. REUTERS/Tatyana Makeyeva

Ethiopian Airlines Cargo terminal workers offload a shipment of Johnson & Johnson's coronavirus disease (COVID-19) vaccines that arrived under the COVAX scheme, at the Bole International Airport in Addis Ababa, Ethiopia July 19, 2021. REUTERS/Tiksa Negeri

An Ethiopian Airlines Cargo terminal worker looks on as he offloads a shipment of Johnson & Johnson's coronavirus disease (COVID-19) vaccines that arrived under the COVAX scheme, at the Bole International Airport in Addis Ababa, Ethiopia July 19, 2021. REUTERS/Tiksa Negeri

An Ethiopian Airlines Cargo terminal worker offloads a shipment of Johnson & Johnson's coronavirus disease (COVID-19) vaccines that arrived under the COVAX scheme, at the Bole International Airport in Addis Ababa, Ethiopia July 19, 2021. REUTERS/Tiksa Negeri

An Ethiopian Airlines Cargo terminal worker offloads a shipment of Johnson & Johnson's coronavirus disease (COVID-19) vaccines that arrived under the COVAX scheme, at the Bole International Airport in Addis Ababa, Ethiopia July 19, 2021. REUTERS/Tiksa Negeri

An Ethiopian Airlines cargo terminal worker prepares to offload a shipment of Johnson & Johnson's coronavirus disease (COVID-19) vaccines that arrived under the COVAX scheme, at the Bole International Airport in Addis Ababa, Ethiopia July 19, 2021. REUTERS/Tiksa Negeri

Rose Slinger George from Fly All Ways airline waits for passengers to check in for the first commercial flight since borders were closed for over a year due to the coronavirus disease (COVID-19) outbreak, at Piarco International Airport, in Piarco, Trinidad and Tobago July 17, 2021. REUTERS/Andrea De Silva

Passengers going to Dominica and Barbados check in at Caribbean Airlines counters, the first commercial flight to depart since borders were closed for over a year due to the coronavirus disease (COVID-19) outbreak, at Piarco International Airport, in Piarco, Trinidad and Tobago July 17, 2021. REUTERS/Andrea De Silva

Travellers stand in front of the check-in counters of Swiss airlines at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

Travellers queue in front of the check-in counters of Swiss airlines at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

Travellers queue in front of the check-in counters of Swiss airlines at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

Travellers queue in front of the check-in counters of Swiss airlines at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

Travellers queue in front of the check-in counters of Swiss airlines at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

Travellers queue in front of the check-in counters of Swiss airlines at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

Travellers queue in front of the check-in counters of Swiss airlines at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

An Airbus A220-100 of Swiss airlines is seen in front as a passenger aircraft approaches to land at Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

An Airbus A321-212 of Iberia airlines is seen in front as an Airbus A330-303 of Turkish Airlines takes-off from Zurich Airport, Switzerland July 10, 2021. REUTERS/Arnd Wiegmann

Logos of airline companies are seen on a screen inside the Terminal 3 at Orly Airport, near Paris, France, July 1, 2021. REUTERS/Sarah Meyssonnier

The logo of airline company Air France is seen inside the Terminal 3 at Orly Airport, near Paris, France, July 1, 2021. REUTERS/Sarah Meyssonnier

The logo of airline company Air France is seen inside the Terminal 3 at Orly Airport, near Paris, France, July 1, 2021. REUTERS/Sarah Meyssonnier

The logo of airline company Air France is seen inside the Terminal 3 at Orly Airport, near Paris, France, July 1, 2021. REUTERS/Sarah Meyssonnier

The logo of airline company Air France is seen inside the Terminal 3 at Orly Airport, near Paris, France, July 1, 2021. REUTERS/Sarah Meyssonnier

Employees of Jetstar Japan, Spring Japan and ZipAir, low-cost airlines which owned subsidiary of Japan Airlines, pose for a photographs near their company's airplanes at Narita international airport in Narita, east of Tokyo, Japan June 30, 2021. REUTERS/Maki Shiraki

Airplanes of Jetstar Japan, Spring Japan and ZipAir, low-cost airlines which owned subsidiary of Japan Airlines, are displayed at Narita international airport in Narita, east of Tokyo, Japan June 30, 2021. REUTERS/Maki Shiraki

Passengers of the first regular flight of the Saudi airline Flynas from Riyadh to Kyiv walk with their luggage after arrival at Boryspil International Airport outside Kyiv, Ukraine June 29, 2021. Picture taken June 29, 2021. REUTERS/Valentyn Ogirenko

The logo of Helvetic Airways is seen on the airline's new Embraer E195-E2 passenger jet after its arrival at Zurich Airport, Switzerland June 25, 2021. REUTERS/Arnd Wiegmann

The logo of Helvetic Airways is seen aboard the airline's new Embraer E195-E2 passenger jet after its arrival at Zurich Airport, Switzerland June 25, 2021. REUTERS/Arnd Wiegmann

CEO Tobias Pogorevc of Helvetic Airways poses together with pilots Jose Alfredo Thome Penna Jr (R) and Marcio Miranda (L) of Brazilian aircraft manufacturer Embraer in front of the airlines new Embraer E195-E2 passenger jet after its arrival at Zurich Airport, Switzerland June 25, 2021. REUTERS/Arnd Wiegmann

CEO Tobias Pogorevc of Helvetic Airways poses together with pilots Jose Alfredo Thome Penna Jr (R) and Marcio Miranda (L) of Brazilian aircraft manufacturer Embraer in front of the airlines new Embraer E195-E2 passenger jet after its arrival at Zurich Airport, Switzerland June 25, 2021. REUTERS/Arnd Wiegmann

A Swiss airline aircraft is pictured at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

A Swissport staff unloads containers from a Swiss airline aircraft at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

Swiss, easyJet, Pegasus and Air France airline aircrafts are pictured on the tarmac at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

A Swiss airline aircraft is pictured next to an EasyJet plane at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

A Pegasus airline aircraft takes off next to an easyJet aircraft at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

Two easyJet airline aircrafts are pictured on the tarmac at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

A Pegasus airline aircraft takes off next to an easyJet aircraft at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

A Pegasus airline aircraft takes off at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

EasyJet airline aircrafts are pictured in front of the control tower on the tarmac at Cointrin airport in Geneva, Switzerland June 24, 2021. REUTERS/Denis Balibouse

A plane flies in front of the setting sun, past a lightning rod, in Shanghai, China June 20, 2021. REUTERS/Aly Song

Airline Pilots from the Recover Irish Aviation group line the street as they protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

A person holds a letter addressed to Irish Chief Medical Officer Dr Tony Holohan as Airline Pilots from the Recover Irish Aviation group protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group and cabin crew protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

A woman holds a placard as Airline Pilots from the Recover Irish Aviation group and cabin crew protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group line the street as they protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group and cabin crew protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group and cabin crew protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne

Airline Pilots from the Recover Irish Aviation group and cabin crew protest current international travel restrictions imposed by Irish government outside the Department of Health, in Dublin, Ireland, June 16, 2021. REUTERS/Clodagh Kilcoyne