As I'm sure most of the leading airlines will. Warren Buffet just purchased nearly 1 million shares of Delta stock. Should I not invest now?
How did he do on Kraft-Heinz?
Delta is probably the best managed US airline, but times are really tough right now, with lots of uncertainty.
Take a look at JPM. Arguably the best run bank in the US. However, news of Jamie Dimon having heart surgery sent the stock down. That's besides for the inherent challenges ahead for the banking industry due to what's happening to interest rates and the overall economic outlook.
The point is that even the best managed companies can have black swan events. Couple that with the uncertainty ahead and then decide whether you're comfortable putting your money there.