With no end in sight to a travel industry crisis caused by the coronavirus pandemic, US airlines requested a $50 billion government bailout.
Airlines for America, an industry trade group, released the wish list including grants, loans and tax relief as governments around the world redoubled efforts to prop up the economy amid a massive slowdown caused by the outbreak.
Trump administration officials have highlighted airlines as a major worry point and signaled support for a federal plan to fortify the industry.
Meanwhile, Aer Lingus owner IAG and EasyJet have both warned that their aircraft would be grounded on an unprecedented scale in a battle to survive the coronavirus.
But while EasyJet said state aid was needed, IAG talked of self-help.
The UK government said it would discuss how to protect the industry from the coronavirus pandemic after EasyJet joined Virgin Atlantic in calling for government help as people across the world stop travelling.
"European aviation faces a precarious future and it is clear that coordinated government backing will be required to ensure the industry survives," easyJet's CEO, Johan Lundgren, said in a statement.
Aer Lingus and British Airways-owner IAG did not ask for government aid, however.
IAG CEO Willie Walsh, who today deferred his retirement due to the crisis, has long opposed any government aid and told investors that airlines should look at self-help first.
"I think individual airlines have been approaching governments looking for state aid. We have not done so," he said.
But he added that the group would accept any general facilities provided to all companies which would benefit employees.
Shares in both airlines dived in morning trading. IAG, which also owns Spain's Iberia and Vueling carriers, was down 23%, its lowest level since 2013, while EasyJet lost 18%, its lowest level since 2012.
EasyJet is in regular contact with the UK government.
It said it wanted governments to provide access to finance to help overcome any short-term liquidity crunches, plus a removal of passenger taxes, a holiday from air traffic charges as well as an extension of the relaxation of a rule in relation to airport slots.
IAG said it would cut its flying capacity by at least 75% in April and May, while EasyJet said it could ground the majority of its fleet on a rolling basis.
The airlines are the third and fourth biggest European carriers on a passenger number basis.
Both airlines said they had strong balance sheets and Citibank research showed that EasyJet and IAG would still have much lower net debt to EBITDA ratios than Air France-KLM and Lufthansa after a simulated three-month shutdown.
IAG said it had total liquidity of €9.3 billion, while EasyJet said it had £1.6 billion of cash plus an undrawn $500m revolving credit facility.
Both airlines said they could not provide profit guidance for their current financial years.
IAG also detailed cost cuts including a freeze on discretionary spending, working hours reductions and a temporary suspension of employment contracts.
CEO Willie Walsh also told investors that 2021 capacity was likely to be lower than currently planned, and that the crisis would accelerate the permanent retirement of dozens of aircraft including BA's 747s and Iberia's A340s.