The United Airlines terminal is viewed at Newark Liberty Airport on July 8, 2015 in Newark, N.J. The airline was criticized on Sunday for enforcing its buddy pass dress code, barring from the plane two girls in their early teens who were wearing leggings. Spencer Platt/Getty Images hide caption

toggle caption
Spencer Platt/Getty Images

Crowds gather to watch the Fourth of July fireworks show last year at Kailua Beach on the Hawaiian island of Oahu. Julie Thurston Photography via Getty Images hide caption

toggle caption
Julie Thurston Photography via Getty Images

Passengers at O'Hare International Airport wait in line to be screened at a Transportation Security Administration (TSA) checkpoint. Scott Olson/Getty Images hide caption

toggle caption
Scott Olson/Getty Images

Security Lines Are Interminable, But With Good Reason

  • Download
  • <iframe src="https://www.npr.org/player/embed/478905299/478962944" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Passengers wait in line to be screened at a Transportation Security Administration checkpoint at Chicago's O'Hare International Airport on Monday. Scott Olson/Getty Images hide caption

toggle caption
Scott Olson/Getty Images

People walk away from Brussels airport after Tuesday's terrorist attack. Analysts say the violence may reduce travel for a while but the industry should bounce back. Geert Vanden Wijngaert/AP hide caption

toggle caption
Geert Vanden Wijngaert/AP

Passengers walk through the terminal as they head to their flights at Reagan National Airport in Arlington, Va., on Dec. 23, 2015. Saul Loeb/AFP/Getty Images hide caption

toggle caption
Saul Loeb/AFP/Getty Images

As Oil Plummets, Cheap Jet Fuel Means Better Travel Deals

  • Download
  • <iframe src="https://www.npr.org/player/embed/463724352/463740447" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Fuel prices have plummeted this year, but airfares have remained high. The International Air Transport Association estimates that the world's airlines will rake in nearly $20 billion in profits this year. Brennan Linsley/AP hide caption

toggle caption
Brennan Linsley/AP

The Year In Air Travel: Packed Planes And More Perks — For A Price

  • Download
  • <iframe src="https://www.npr.org/player/embed/372512914/372837201" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

A plane takes off over a departure board at Hartsfield-Jackson Airport in Atlanta last November. Airlines say they expect an uptick in Thanksgiving travel this year. David Goldman/AP hide caption

toggle caption
David Goldman/AP

Air traffic connections from West Africa to the rest of the world: While Guinea, Liberia and Sierra Leone don't have many flights outside the region, Nigeria is well-connected to Europe and the U.S. PLOS Currents: Outbreaks hide caption

toggle caption
PLOS Currents: Outbreaks

Passengers packed the waiting hall Tuesday at Hongqiao Railway Station, which services a terminal at Shanghai Hongqiao International Airport. Johannes Eisele/AFP/Getty Images hide caption

toggle caption
Johannes Eisele/AFP/Getty Images