American Airlines Group Inc

The data do not support a causal story.

We believe a potential FAA grounding and suspension of deliveries would pose the greatest risk to Southwest.

The Oracle of Omaha and his lieutenants initiated positions in JPMorgan Chase and Oracle, among others, last quarter.

We're not changing our fair value estimate after management rolled back capacity expansion for the coming quarter and raised projections for other revenue.

Although we've raised our estimates, the carriers still look fairly valued.

Several funds take a dive into GE as industrials receive some attention this quarter along with General Motors.

The company added to several positions during the second quarter, and two of those stocks are in buying range today according to our ratings.

We explore how Morningstar's new metrics go beyond carbon footprinting.

Passive inflows continue to make for a difficult stock-picking environment.

Managers from Oakmark, American Century and Diamond Hill picked up airlines, health-care companies, and an industrial distributor in the fourth quarter.

A new line of research suggests that diversification across stocks in an industry can reduce competition, but that argument is weak.

New revenue opportunities that were quantified at the firm's latest investor day drove the $3 per share boost.

Conservatism remained the name of the game in the most recent period because, to our managers, valuations still look stretched.

Undervalued Delta remains our top pick.

Price discipline can offset some of the risks of investing in no-moat firms.

We question both Qatar Airways' tactics and strategy.

GM, Johnson Controls, and Stericycle are our favorites.

We think investors are overlooking the solid air traffic growth forecast for 2017.

We take a numerical look through this week's Morningstar research. Plus, our most popular articles and videos for the week ended Feb. 17.

Apple becomes a top 10 holding as Warren Buffett's Berkshire Hathaway continues to bet on U.S. airlines.