I thought this was an interesting article on the snowball effect of troubled times. https://www.fool.com/investing/2020/05/06/if-norwegian-cruise-line-goes-down-carnival-and-ro.aspx
It describes how Norwegian Cruise Lines is in trouble and it could cause trouble for the other cruise lines as well. I can see this happening in the airline industry as well. I know in the US that refunds are mandatory, but not so in Canada, and the EU airlines are pushing for vouchers instead of refunds. As airlines go down, their could be panic in that industry as well from consumers that accepted vouchers. What if a major hotel chain fails?