You literally could not get a more clear sign of what's ahead for the entire airline industry. Buffet didn't even sell everything in 2008-09, and even now he won't say he expects a turnaround anytime soon.
RIP Airline industry.
https://www.cnbc.com/2020/05/02/warren-buffett-says-berkshire-sold-its-entire-position-in-airlines-because-of-the-coronavirus.html