United Airlines planes sit on the tarmac at San Francisco International Airport on July 8, grounded by a computer glitch. Some 3,500 United passengers around the world were delayed. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

United Airlines jets are parked at Newark Liberty International Airport in Newark, N.J. Julio Cortez/AP hide caption

itoggle caption Julio Cortez/AP

A view of Pearlington, Miss., 10 years after Hurricane Katrina. The East Pearl River and St. Tammany Parish in Louisiana are to the left. David Grunfeld/The Times-Picayune/Landov hide caption

itoggle caption David Grunfeld/The Times-Picayune/Landov

Ten years ago, Hurricane Katrina made landfall near Pearlington, Miss., a tiny town on the border with Louisiana. A home currently under construction there adheres to new FEMA standards for elevation. David Schaper/NPR hide caption

itoggle caption David Schaper/NPR