This summer is already shaping up to be a difficult one for air travelers. Southwest Airlines customers have struggled with thousands of delays and hundreds of canceled flights in the past three weeks because of computer problems, staffing shortages and bad weather. American Airlines is also grappling with a surge in delays, and it has trimmed its schedule through mid-July at least in part because it doesn't have enough pilots, according to the pilots' union.

The first private space station crew was introduced Tuesday: Three men who are each paying $55 million to fly on a SpaceX rocket.

In Kailua, the sand is soft and white, the water is clear and calm, and the view is exactly what you would expect from a beach in the Hawaiian Islands. Those are among the reasons Oahu's Kailua Beach Park has been selected as the best stretch of sand for an annual list of top U.S. beaches. Stephen Leatherman, a coastal scientist and professor at Florida International University, has been drafting the list under the alias "Dr. Beach" since 1991.