Buffett's four dumped airline holdings amounted to a minuscule 1.5% of BRK holdings.
Hard to doubt his reasons for selling: Too many planes, too much industry debt, too many airlines and a very murky future. Buffett has often enunciated his main task in running BRK which is to protect and grow his investors' money.
I think WB more than earns his annual salary of $100,000.