The latest attempt by airlines to raise fares has collapsed.
Delta Air Lines said Thursday that it rolled back an increase of $4 to $10 per round trip on many U.S. routes. Delta had raised prices to match a hike by United Airlines.
One analyst said the increase unravelled because it gained only limited support from a few other carriers - American, Alaska and US Airways. He says airlines have tried 12 fare hikes this year but only four have succeeded.
