Is Warren upset that he went ouside his sweet spot when he bought major shares in American, Delta, Southwest and United airlines? His analysis showed that investing in airlines last century would have netted him precisely zero dollars. However, this century's tourism boom seems to have persuaded him that now was the time to set aside that analysis. So in he went. THEN the coronavirus pandemic hit. And out he scampered for a $7 billion dollar loss! I wonder what an experience like that does to one's psyche.