Biggest payments for airlines are 1.) Manufacturers 2.) Wages 3.) Fuel 4.) Airports / ATC / APD
Ryanair likely would be to EXIM but bearing in mind that Boeing will owe Ryanair couple of hundred million for Max issue then really not an issue, U2 will get relief via National Govts who will want to look after national airlines and airbus.
Staff will be paid but lots will be laid off which Govts will be paying as technically unemployed unless Govts do a deal, can see this happening
Fuel - Drop in fuel prices is of no benefit as airlines will have forward bought into next year, they will need to use up what they bought and as nobody flying it could be 2 yrs worth. Unless a deal done but if not using then little cash going out.
Airports / ATC................... generally owned by Govts who will hold back on demands for money to ensure airlines don't go bust. Govt aid ( with EU support) will stop shouting.
Airlines can survive to end of year in reduced capacity provided they manage the cash and Govts in relation to APD operate leniently.