The deepening nature of the crisis for airlines was highlighted by IATA's plans to delay its annual meeting from June to October because it does not expect borders to have properly re-opened to allow such a gathering by late June.
Many European airlines have said they need a summer holiday season if they are to survive after almost a year of COVID-19 restrictions which have stopped travel.
IATA Director General Alexandre de Juniac said that governments had already provided $225 billion to help airlines, through direct aid, wage subsidies, tax relief and loans, but warned more was needed.
"I urge governments to consider stimulus measures," he told reporters on Wednesday.
De Juniac said airlines did not need more debt and said that one way for government to provide support would be to subsidise tickets to help the sector.
But any government subsidies for airlines would likely spark a negative reaction from environmentalists. Aviation accounts for 2% of global carbon emissions and campaigners are calling for the reduction in flying due to COVID-19 to be permanent.
"The new normal is going to mean less flying, especially corporate travel, and the industry must adjust," said Andrew Murphy from Brussels-based green campaign group Transport & Environment.
"Public funds should be channelled into developing cleaner fuels and new plane designs, not subsiding what's still the most carbon-intensive form of travel."
De Juniac said that by October, he expected borders to have re-opened allowing the annual industry gathering to take place in Boston. He also said that the EU's proposal on a bloc-wide "green digital certificate" to allow travel was positive.
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Good keep them close to 2022