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How can the U.S. help Ukraine's air defense? The U.S. turned aside one plan to send Ukraine's planes. The Pentagon said the country has planes, and need anti-aircraft missiles more.

The good news is that air travel to and from Venezuela is dirt cheap due to the difference between the official cost of tickets and the black-market currency rate. The bad news is that many flights are booked up months in advance.

The Federal Aviation Administration's order to reduce flights nationwide is set to take effect Friday. The agency says the cuts are needed to keep the skies safe during the government shutdown.

Exhaust from school buses can be harmful to students' health. Old diesel buses generate fumes that can trigger asthma attacks and other harmful health conditions. In Texas, environmentalists want the state to help pay for new low-exhaust equipment for the state's buses. It costs as much as $7,000 per bus, and school districts say they don't have the money.

A critical computer system of the Federal Aviation Administration failed, leading to the delays or cancellations of thousands of flights. The antiquated system is now functioning but questions remain.

Transportation officials have restricted helicopter flights around Ronald Reagan Washington National Airport after Wednesday's mid-air collision between an Army helicopter and an American Airlines jet.

Scientists have found a way to sample DNA out of the air on a nationwide scale -- making it possible to one day track the health and well being of species around the globe.

NPR's Scott Simon talks to Prof. Jana Houser of The Ohio State University about the massive tornadoes that hit the Midwest this week.

Fresh Air rock critic Ken Tucker says The Mountain Goats' concept album about pro wrestling is filled with a remarkable range of melodies and moods.

NPR broadcast its first on-air original programming 50 years ago today: May 3, 1971.