Delta has struggled to compete in Asia with growing Chinese air travel and the lack of a partner in Japan.
American Airlines might want to think about making a deal with Qatar Airways, which is battling a blockade by the UAE, home of Emirates and Etihad.
Berkshire Hathaway invested billions of dollars into the U.S. airline industry earlier this year.
Qatar Airways says it wants to buy 10% of American Airlines. American Airlines pilots say the effort 'has got to be stopped.'