Delta's and Macy's stocks both jumped right after the news (up 3.2% and 5.9%).
Berkshire also boosted its stakes in Alphabet (now worth $16.6 billion) and more than doubled its stake in The New York Times to about 9%.
Meanwhile, they sold many of their smaller stock holdings, including Amazon, Visa, Mastercard, and UnitedHealth Group.
Most of the stock sales were likely directed by Abel.