An FAA computer failure is blamed for causing scattered delays at Denver International Airport.

Airport spokesman Chuck Cannon said some flights were delayed by 10 or 15 minutes Thursday morning.

Frontier Airlines showed delays on a number of east coast flights on DIA's Web site.

The Federal Aviation Administration said the problem, which lasted about five hours, was fixed around 8 a.m. Denver time, but it was unclear how long flights would continue to be affected.

Aviation officials told The Associated Press that the problem began at the computer center in the Salt Lake City area. The officials asked not to be named because they were not authorized to speak publicly.

Doug Church, a spokesman for the National Air Traffic Controllers Union, said controllers were still entering flight plans manually in some locations and that was slowing things down.

FAA spokesman Paul Takemoto said the problem started between 2:15 and 3:30 a.m. Denver time and affected mostly flight plans but also traffic management, such as ground stops and ground delays.

Airplane dispatchers had to send plans to controllers, who entered them into computers by hand.

"It's slowing everything down," Takemoto said.

Hartsfield-Jackson Atlanta International Airport, the world's busiest, was particularly affected. Chicago and Washington, D.C., and New York metro airports also reported delays due to the glitch. The problem was exacerbating delays caused by bad weather in the Northeast. Orlando International Airport, Florida's busiest, also reported about a dozen delays due to the chain reaction around the country, and flights in Tampa, Fla., were also delayed.