Employees work on a Ryanair plane preparing to take off at the Rosalia De Castro airport in Santiago de Compostela, Spain June 24, 2022. REUTERS/Nacho Doce 

Thai AirAsia cabin crew members wearing masks to prevent the spread of the coronavirus disease (COVID-19) study their domestic routes ahead of their flights, at Bangkok's Don Muang International Airport, Thailand, October 27, 2021. Picture taken October 27, 2021. REUTERS/Athit Perawongmetha 

Thai AirAsia cabin crew members wearing masks to prevent the spread of the coronavirus disease (COVID-19) walk ahead of their flights at Bangkok's Don Muang International Airport, Thailand, October 27, 2021. Picture taken October 27, 2021. REUTERS/Athit Perawongmetha 

Thai AirAsia cabin crew members wearing masks to prevent the spread of the coronavirus disease (COVID-19) are seen ahead of their flights at Bangkok's Don Muang International Airport, Thailand, October 27, 2021. Picture taken October 27, 2021. REUTERS/Athit Perawongmetha 

A cabin crew member reacts as South Africa's national airline, South African Airways (SAA), prepares to take off after a year-long hiatus triggered by it running out of funds, at O.R. Tambo International Airport in Johannesburg, South Africa, September 23, 2021. REUTERS/Siphiwe Sibeko 

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 

A girl wearing a Singapore Airlines cabin crew uniform is pictured through a window of a replica aircraft during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

Participants sit in a business class cabin replica during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

Participants visit an economy class cabin replica during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

Participants listen to cabin crew during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

Cabin crew perform a demonstration during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

Cabin crew speak to participants during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

People take photos of a business class cabin replica during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

Cabin crew wait for participants during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

Cabin crew wait for participants during a guided tour at the Singapore Airlines Training Centre in Singapore November 21, 2020. The airlines offered tours of its training centre and flight simulator experiences as part of a series of initiatives to try an re-engage customers who have not been able to travel due to the coronavirus disease (COVID-19) pandemic. REUTERS/Edgar Su 

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 

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 staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane which performed a domestic flight, amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon 

A staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane which performed a domestic flight, amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon 

A staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane after performing a domestic flight as passengers disembarked at Haneda airport on the first day after the Japanese government lifted the state of emergency, in Tokyo, Japan May 26, 2020. REUTERS/Kim Kyung-Hoon 

A staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane after performing a domestic flight as passengers disembarked at Haneda airport on the first day after the Japanese government lifted the state of emergency, in Tokyo, Japan May 26, 2020. REUTERS/Kim Kyung-Hoon 

Japan Airlines' staff members wearing protective face masks and gloves clean the cabin of a plane after performing a domestic flight as passengers disembarked at Haneda airport on the first day after the Japanese government lifted the state of emergency, in Tokyo, Japan May 26, 2020. REUTERS/Kim Kyung-Hoon 

Cabin crews pose for a photo before their flight as local flights resume at Suvarnabhumi Airport during the coronavirus disease (COVID-19) outbreak in Bangkok, Thailand April 30, 2020. REUTERS/Soe Zeya Tun 

Cabin crews pose for a photo before their flight as local flights resume at Suvarnabhumi Airport during the coronavirus disease (COVID-19) outbreak in Bangkok, Thailand April 30, 2020. REUTERS/Soe Zeya Tun 

Flight attendants talk in a nearly empty cabin on a Delta Airlines flight operated by SkyWest Airlines as travel has cutback, amid concerns of the coronavirus disease (COVID-19), during a flight departing from Salt Lake City, Utah, U.S. April 11, 2020. REUTERS/Jim Urquhart 

A timetable shows cancelled flights during a strike of cabin crew employees of German airline Germanwings called by German cabin crew union UFO, at Tegel Airport in Berlin, Germany December 30, 2019. REUTERS/Michele Tantussi 

A timetable shows cancelled flights during a strike of cabin crew employees of German airline Germanwings called by German cabin crew union UFO, at Tegel Airport in Berlin, Germany December 30, 2019. REUTERS/Michele Tantussi 

A timetable shows cancelled flights during a strike of cabin crew employees of German airline Germanwings called by German cabin crew union UFO in Cologne, Germany, December 30, 2019. REUTERS/Thilo Schmuelgen 

A timetable shows cancelled flights during a strike of cabin crew employees of German airline Germanwings called by German cabin crew union UFO in Cologne, Germany, December 30, 2019. REUTERS/Thilo Schmuelgen 

A timetable shows cancelled flights during a strike of cabin crew employees of German airline Germanwings called by German cabin crew union UFO in Cologne, Germany, December 30, 2019. REUTERS/Thilo Schmuelgen 

Lufthansa flight attendants gather at a strike of the airline's cabin crew union (UFO) at Frankfurt Airport, Germany November 8, 2019. REUTERS/Ralph Orlowski 

Lufthansa flight attendants gather at a strike of the airline's cabin crew union (UFO) at Frankfurt Airport, Germany November 8, 2019. REUTERS/Ralph Orlowski 

An information flight pannel is seen during a strike of Lufthansa airline's cabin crew union (UFO) at Frankfurt airport, Germany November 7, 2019. REUTERS/Ralph Orlowski 

An information flight pannel is seen during a strike of Lufthansa airline's cabin crew union (UFO) at Frankfurt airport, Germany November 7, 2019. REUTERS/Ralph Orlowski 

Ethiopian Airlines cabin crew members mourn as pallbearers carry the coffin of their colleague, who was on the Ethiopian Airlines Flight ET 302 plane crash, during the burial ceremony at the Holy Trinity Cathedral Orthodox church in Addis Ababa, Ethiopia, March 17, 2019. REUTERS/Tiksa Negeri 

Ethiopian Airline cabin crew member mourns her colleagues, Ethiopian Airline Flight ET 302 plane crash victims, during their burial ceremony at the Holy Trinity Cathedral Orthodox church in Addis Ababa, Ethiopia, March 17, 2019. REUTERS/Tiksa Negeri 

Kebebew Legesse, the mother of Ethiopian Airlines cabin crew Ayantu Girmay mourns at the scene of the Ethiopian Airlines Flight ET 302 plane crash, near the town Bishoftu, near Addis Ababa, Ethiopia March 12, 2019. REUTERS/Baz Ratner TPX IMAGES OF THE DAY 

Kebebew Legesse, the mother of Ethiopian Airlines cabin crew Ayantu Girmay mourns at the scene of the Ethiopian Airlines Flight ET 302 plane crash, near the town Bishoftu, near Addis Ababa, Ethiopia March 12, 2019. REUTERS/Baz Ratner 

Kebebew Legesse, the mother of Ethiopian Airlines cabin crew Ayantu Girmay mourns at the scene of the Ethiopian Airlines Flight ET 302 plane crash, near the town Bishoftu, near Addis Ababa, Ethiopia March 12, 2019. REUTERS/Baz Ratner 

Kebebew Legesse, the mother of Ethiopian Airlines cabin crew Ayantu Girmay mourns at the scene of the Ethiopian Airlines Flight ET 302 plane crash, near the town Bishoftu, near Addis Ababa, Ethiopia March 12, 2019. REUTERS/Baz Ratner 

Cabin serviettes are seen at the scene of the Ethiopian Airlines Flight ET 302 plane crash, near the town of Bishoftu, southeast of Addis Ababa, Ethiopia March 10, 2019. REUTERS/Tiksa Negeri 

An Airbus A330-800 aircraft flies during a flight event presentation in Colomiers near Toulouse, France, November 6, 2018. REUTERS/Regis Duvignau 

Passengers are pictured at a check-in terminal as Ryanair pilots and cabin crew stage a 24-hour strike affecting flights out of Germany, at Schoenefeld Airport, south of Berlin, Germany, September 12, 2018. REUTERS/Fabrizio Bensch 

A Ryanair aircraft is pictured on a parking position as Ryanair pilots and cabin crew stage a 24-hour strike affecting flights out of Germany, at Schoenefeld Airport, south of Berlin, Germany, September 12, 2018. REUTERS/Fabrizio Bensch 

A woman walks past Ryanair aircrafts on their parking positions as Ryanair pilots and cabin crew stage a 24-hour strike affecting flights out of Germany, at Schoenefeld Airport, south of Berlin, Germany, September 12, 2018. REUTERS/Fabrizio Bensch 

Ryanair aircrafts are seen on parking positions as Ryanair pilots and cabin crew stage a 24-hour strike affecting flights out of Germany, at Schoenefeld Airport, south of Berlin, Germany, September 12, 2018. REUTERS/Fabrizio Bensch 

A Ryanair aircraft is seen on a parking position as Ryanair pilots and cabin crew stage a 24-hour strike affecting flights out of Germany, at Schoenefeld Airport, south of Berlin, Germany, September 12, 2018. REUTERS/Fabrizio Bensch 

Passengers walk past union banners as Ryanair pilots and cabin crew stage a 24-hour strike affecting flights out of Germany, at Schoenefeld Airport, south of Berlin, Germany, September 12, 2018. REUTERS/Fabrizio Bensch 

A passenger walks past union banners as Ryanair pilots and cabin crew stage a 24-hour strike affecting flights out of Germany, at Schoenefeld Airport, south of Berlin, Germany, September 12, 2018. REUTERS/Fabrizio Bensch 

A Ryanair airplane, of a canceled flight, is seen on the first day of a cabin crew strike held in several European countries, at the airport in Malaga, Spain, July 25, 2018. REUTERS/Jon Nazca 

A Ryanair passenger reacts as she receives information about her flight on the first day of a cabin crew strike held in several European countries, at the Adolfo Suarez Madrid Barajas airport in Madrid, Spain, July 25, 2018. REUTERS/Susana Vera 

Stranded Ryanair passengers wait to receive information about their flights on the first day of a cabin crew strike held in several European countries, at the Adolfo Suarez Madrid Barajas airport in Madrid, Spain, July 25, 2018. REUTERS/Susana Vera 

Stranded Ryanair passengers wait to receive information about their flights on the first day of a cabin crew strike held in several European countries, at the Adolfo Suarez Madrid Barajas airport in Madrid, Spain, July 25, 2018. REUTERS/Susana Vera 

A Ryanair canceled flight is seen on the information panel, on the first day of a cabin crew strike held in several European countries, at the Adolfo Suarez Madrid Barajas airport in Madrid, Spain, July 25, 2018. REUTERS/Susana Vera 

A cabin crew supervisor makes an announcement aboard an Ethiopian Airlines flight to Asmara international airport in Asmara, Eritrea July 18, 2018. REUTERS/Tiksa Negeri 

Ethiopian Airlines cabin crew supervisor speaks to a passenger on board their flight to Asmara, Eritrea July 18, 2018. REUTERS/Tiksa Negeri 

Ethiopian Airlines cabin crew pose for a photograph as they resume flights to Eritrea's capital Asmara at the Bole International Airport in Addis Ababa, Ethiopia July 18, 2018. REUTERS/Kumera Gemechu 

A woman waits for her flight at the departures area inside the international airport, during an indefinite strike of the Cabin Crew Union of LAN Express, a subsidiary of the Chile-based LATAM Airlines group, in Santiago, Chile April 10, 2018. REUTERS/Rodrigo Garrido 

A woman waits for her flight at the departures area inside the international airport, during an indefinite strike of the Cabin Crew Union of LAN Express, a subsidiary of the Chile-based LATAM Airlines group, in Santiago, Chile April 10, 2018. REUTERS/Rodrigo Garrido 

Passengers wait for their flights at the departures area inside the international airport, during an indefinite strike of the Cabin Crew Union of LAN Express, a subsidiary of the Chile-based LATAM Airlines group, in Santiago, Chile April 10, 2018. REUTERS/Rodrigo Garrido