Delta

It protects from drizzles and thunderstorms but not a hurricane. In other words, if you are exposed again and again to infected people, there's some risk you could get sick.

Here's what we know about the effectiveness of vaccines for variants of concerns, notably the delta variant, first identified in India and now responsible for more than 20% of new U.S. cases.

NPR's Leila Fadel talks to Dr. Anthony Fauci about the CDC declaring the Delta variant of COVID-19 a concern, and how vaccines and booster shots fit into the discussion of combating variants.

United's CEO says the change was a top request from customers. Delta and American followed suit after United's announcement. Airlines are trying to coax wary customers to return amid the pandemic.

The matter of masks on planes has led to some contentious moments — and serious consequences. Is it legal to ban a passenger from flying for violating a mask mandate?

Delta's massive outage wasn't the first malfunction to wreak havoc on an airline. The industry's systems are complex and require high security, which can make them more prone to shutdowns.

Delta said it was still in "recovery mode" a day after a system outage scuttled about 1,000 flights. It announced $200 vouchers for people whose flights were canceled or delayed more than three hours.

The two lanes, which were designed by Delta, were rolled out last month. TSA administrator Peter Neffenger told a Senate committee that "initial results show dramatic improvements."