Atlanta ? Freezing rain and sleet coated parts of the Southeast with a layer of ice Saturday, canceling hundreds of airline flights, knocking out power to thousands of customers and shutting down sections of every interstate highway in the metro Atlanta area.

Three weather-related traffic deaths were reported, two in Georgia and one in South Carolina, police said.

At Hartsfield-Jackson Atlanta International Airport, only one of the four runways was open for much of the day and “very few flights are coming or going,” said airport spokeswoman Felicia Browder.

AirTran alone canceled 90 flights for the day, spokesman Tad Hutcheson said.

“It was the worst possible combination of ice, sleet and freezing rain,” Hutcheson said. “That is the hardest stuff to get off the planes. They were spraying the de-icing fluid on the plane to get it off, and it was refreezing.”

Delta could not provide a number of canceled flights until the end of the day, but had cut its schedule systemwide by about 40 percent in anticipation of the storm, spokesman Anthony Black said.

In South Carolina, Delta, Northwest Airlines, U.S. Airways and others canceled flights from Greenville-Spartanburg International Airport and Columbia Metropolitan Airport.

The atrium at the Atlanta airport became a campground for hundreds of stranded travelers after airlines canceled 49 departures and 147 arrivals.

Whitney Klosterman, 10, of Mooreton, N.D., naps in a chair at Hartsfield-Jackson International Airport in Atlanta. She and her family were camped out in the atrium area Saturday while hoping for a flight. The family has been at the airport since Friday night after their plane taxied back to the terminal after sitting on the runway for three-and-a-half hours.

“That is about 10 percent of what we normally do for flights,” airport spokeswoman Lanii Thomas said.

The ice also accumulated on power lines and tree limbs, and at least 178,000 Georgia Power customers were without power Saturday night, including about 140,000 in the Atlanta area.

Georgia Electric Membership Corp. reported 72,000 homes and businesses without power across the state.