The big problem is that it's easy to bring in a travel ban but who decides to lift it? I can see some politicians saying we have to wait until there are NO cases in country A (or B or c...) for a month - and each country will make different choices. It could be 8-9 months before we see any serious resumption of air travel. Right now the industry is closing down rapidly - I'd expect EVERY airline to go into the local equivalent of Chapter 11.
In that case contracts and legal protections are pretty useless - you CAN sue a dead dog but it's not going to get us anywhere
I'd suggest we accept there will be mass lay-offs, suspensions etc and it may be a couple of years before everyone is back into work - if we're lucky . A reasonable comparison is the Oil & Gas Industry - when it all went south in 2013/14 they faced 5 years of cutbacks - hundreds of thousands laid off and many had to find other work somewhere/anywhere