Brian Sumers

The grounding of the Boeing 737 Max worldwide may be the most consequential aviation event in the past decade. Boeing is still confident the plane will fly again. But when?

Sun Country is America's smallest airline that operates big jets, like Boeing 737s. It competes in a scale business, so it is always at a disadvantage. The good news is that management has been prioritizing innovation.

Utah has always been a fine place to base a regional airline. But it's an unusual spot to build what is almost certainly going to be a nationwide carrier. But with technology, founder David Neeleman is betting that where an airline is headquartered no longer matters.

People may see short-term rentals as a good get-rich-quick scheme. But according to former Airbnb CFO Laurence Tosi, it's not a simple business. The most successful companies in the space, he said, are also the most sophisticated.

In almost every room he enters, Scott Kirby is the smartest person. Everyone knows it — including him. As CEO, though, he may need to show a little humility. Can he do it?

Airlines know passengers care about the environment, so they're all ready with talking points to provide their sustainability bonafides. But many are changing little about their strategies.

Don't read too much into this. It is probably more symbolic than anything else. For a long time, U.S. airlines have had little interest in cities other than Havana.

Southwest Airlines always is hesitant to mess with its secret sauce. But it's a gigantic airline, and it might benefit from operating more than one aircraft type.

Boeing said Wednesday it expects regulators in some countries soon will approve its fixes to the 737 Max program. We've heard this before. But indications seem to suggest Boeing is close this time.

It isn't easy being in the aviation business, but airlines have one advantage over a traditional company. Their assets are mobile. If a carrier like JetBlue discovers softness in one region, it can move its airplanes elsewhere.