Perhaps this line from their 2019 results might answer the question;
In considering management’s assessment of the Group’s ability to continue as a going concern, the Committee had regard to available sources of finance including access to the capital markets, the cash on hand of approximately €3.2bn at March 31, 2019 and the sensitivity to changes in these items.
https://investor.ryanair.com/wp-cont...ual-Report.pdf
JAS