Firefighters of Schutz & Rettung Zurich communal rescue service carry a person during the emergency exercise "McFly 21" in front of an Airbus A320 aircraft of Swiss airlines at Zurich Airport, Switzerland October 26, 2021. REUTERS/Arnd Wiegmann

A flight attendant uses a megaphone to give instructions as people leave an Airbus A320 aircraft of Swiss airlines during the emergency exercise "McFly 21" at Zurich Airport, Switzerland October 26, 2021. REUTERS/Arnd Wiegmann

A flight attendant uses a megaphone to give instructions as people leave an Airbus A320 aircraft of Swiss airlines during the emergency exercise "McFly 21" at Zurich Airport, Switzerland October 26, 2021. REUTERS/Arnd Wiegmann

Firefighters of Schutz & Rettung Zurich communal rescue service help a person during the emergency exercise "McFly 21" in front of an Airbus A320 aircraft of Swiss airlines at Zurich Airport, Switzerland October 26, 2021. REUTERS/Arnd Wiegmann

Firefighters of Schutz & Rettung Zurich communal rescue service carry a person during the emergency exercise "McFly 21" in front of an Airbus A320 aircraft of Swiss airlines at Zurich Airport, Switzerland October 26, 2021. REUTERS/Arnd Wiegmann

LATAM Airlines' CEO Roberto Alvo speaks during the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

LATAM Airlines' CEO Roberto Alvo, Copa Airlines' CEO Pedro Heilbron, CEO of Avianca Holdings S.A. Adrian Neuhauser and Aerolineas Argentinas' CEO Pablo Ceriani attend the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

Copa Airlines CEO Pedro Heilbron speaks during the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

Aerolineas Argentinas CEO Pablo Ceriani speaks during the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

CEO of Avianca Holdings S.A. Adrian Neuhauser attends the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

Aerolineas Argentinas CEO Pablo Ceriani speaks during the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

LATAM Airlines' CEO Roberto Alvo speaks during the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

Copa Airlines CEO Pedro Heilbron speaks during the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

CEO of Avianca Holdings S.A. Adrian Neuhauser speaks during the ALTA Airlines Leaders Forum in Bogota, Colombia October 25, 2021. REUTERS/Luisa Gonzalez

Pedro Heilbron CEO of Copa Airlines and Jose Ricardo Botelho CEO of ALTA attend the ALTA Airlines Leaders Forum, in Bogota, Colombia, October 24, 2021. REUTERS/Luisa Gonzalez

Pedro Heilbron, CEO of Copa Airlines, attends the ALTA Airlines Leaders Forum in Bogota, Colombia October 24, 2021. REUTERS/Luisa Gonzalez

Ricardo Botelho, CEO of ALTA, speaks during the ALTA Airlines Leaders Forum, in Bogota, Colombia October 24, 2021. REUTERS/Luisa Gonzalez

Pedro Heilbron, CEO of Copa Airlines, attends the ALTA Airlines Leaders Forum in Bogota, Colombia October 24, 2021. REUTERS/Luisa Gonzalez

Pedro Heilbron, CEO of Copa Airlines, attends the ALTA Airlines Leaders Forum in Bogota, Colombia October 24, 2021. REUTERS/Luisa Gonzalez

Ricardo Botelho, CEO of ALTA, speaks during the ALTA Airlines Leaders Forum, in Bogota, Colombia October 24, 2021. REUTERS/Luisa Gonzalez

Pedro Heilbron, CEO of Copa Airlines, attends the ALTA Airlines Leaders Forum in Bogota, Colombia October 24, 2021. REUTERS/Luisa Gonzalez

El Salvador's President Nayib Bukele leaves after the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele leaves after the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele leaves after the opening ceremony of Volaris airlines, along with Volaris CEO Enrique Beltranena, at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele speaks during the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele speaks during the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele speaks during the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele speaks during the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele takes part in the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele takes part in the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

El Salvador's President Nayib Bukele speaks with Volaris CEO Enrique Beltranena during the opening ceremony of Volaris airlines at the El Salvador International Airport in San Luis Talpa, El Salvador October 19, 2021. REUTERS/Jose Cabezas

A boy jumps from a replica aeroplane of Air India airlines at a park in Mumbai, India, October 19, 2021. REUTERS/Francis Mascarenhas

A man walks past a mural of Air India airlines on a street in Mumbai, India, October 19, 2021. REUTERS/Francis Mascarenhas

A bird flies over a logo of Air India airlines at the corporate headquarters in Mumbai, India, October 19, 2021. REUTERS/Francis Mascarenhas

A woman walks past Air India airlines branding at a park in Mumbai, India, October 19, 2021. REUTERS/Francis Mascarenhas

Protester Marta Garcia dressed up as an airline pilot poses with a waxwork of a pig, as people hold signs at a demonstration against the export of living pigs from Ireland to China, in Dublin, Ireland, October 19, 2021. REUTERS/Clodagh Kilcoyne

A Binter airlines staff member walks next to empty checking desks after flights were cancelled due to an accumulation of volcanic ash, at La Palma Airport, outside Santa Cruz de la Palma, on the Canary Island of La Palma, Spain October 17, 2021. REUTERS/Susana Vera

People protest at Fiumicino airport against Italia Trasporto Aereo (ITA), as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane TPX IMAGES OF THE DAY

Police block the entrance to Terminal 1 of Fiumicino airport during a protest against Italia Trasporto Aereo (ITA), as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

A person shows a hand painted with Alitalia logo during a protest against Italia Trasporto Aereo (ITA) at Fiumicino airport, as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

A person holds a picture of Italy's Prime Minister Mario Draghi and ITA Executive Chairman Alfredo Altavilla during a protest against Italia Trasporto Aereo (ITA), as the new airline carrier starts flying in place of bankrupt Alitalia, at Fiumicino airport in Rome, Italy, October 15, 2021. The picture reads 'You are a national shame'. REUTERS/Guglielmo Mangiapane

A person shows a hand painted with Alitalia logo, as workers protest against Italia Trasporto Aereo (ITA), as the new airline carrier starts flying in place of bankrupt Alitalia, at Fiumicino airport in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

A person reacts as Alitalia workers protest against Italia Trasporto Aereo (ITA), as the new airline carrier starts flying in place of bankrupt Alitalia, at Fiumicino airport in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

People gather outside Fiumicino airport as Alitalia workers protest against Italia Trasporto Aereo (ITA), as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

Alitalia workers gather outside Fiumicino airport to protest against Italia Trasporto Aereo (ITA), as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

The ITA sign is displayed at Fiumicino airport as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

The information screen at Fiumicino airport displays ITA flights as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

The ITA sign is displayed at Fiumicino airport as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

The information screen displays ITA flights as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

The information screen at Fiumicino airport displays ITA flights as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

The ITA sign is displayed at Fiumicino airport as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane


A person is seen in front of an information board displaying ITA flights as the new airline carrier starts flying in place of bankrupt Alitalia, in Rome, Italy, October 15, 2021. REUTERS/Guglielmo Mangiapane

IATA's Director General Willie Walsh speaks at an Aviation Club U.K. event in central London, Britain, October 13, 2021. REUTERS/Sarah Young

Passengers check in for a Southwest Airlines flight at Orlando International Airport in Orlando, Florida, U.S., October 11, 2021 . REUTERS/Joe Skipper

Passengers check in for a Southwest Airlines flight at Orlando International Airport in Orlando, Florida, U.S., October 11, 2021. REUTERS/Joe Skipper

Waiting passengers are reflected in the safety screens at an empty ticket counter showing delayed flights at a Southwest gate at the airport in El Paso, Texas, U.S., October 11, 2021 . REUTERS/Mike Blake

Passengers check in for a Southwest Airlines flight at Orlando International Airport in Orlando, Florida, U.S., October 11, 2021 . REUTERS/Joe Skipper

Damian Ward of Washington, D.C. sits in the Orlando International Airport with his family after flight delays kept them from returning home for two days in Orlando, Florida, U.S., October 11, 2021 . REUTERS/Joe Skipper

Passengers check in for a Southwest Airlines flight at Orlando International Airport in Orlando, Florida, U.S., October 11, 2021. REUTERS/Joe Skipper

A Southwest Airlines jet sits at a gate at Orlando International Airport in Orlando, Florida, U.S., October 11, 2021 . REUTERS/Joe Skipper