American, Delta and United boost unit revenue guidance as yields improve.
Traffic on U.S. airlines will climb 3.5% to 45 million passengers during the 21 days that start Dec. 16. U.S. airlines are the world's most profitable, a survey says.
The transportation department is considering whether to require airlines to provide their fares to all the websites that want them.
Retail investors lowered their exposure to U.S. stocks in November with banks and airlines leading the way, even though the indexes moved higher, according to a TD Ameritrade survey.