Delta Air Lines backs off fare increase

The latest unsuccessful attempt came last week when Delta raised domestic fares by $4 to $10 per round trip -- but then on Friday it backed off.

No other airline matched the increase.

After two years of raising prices, airlines are finding it much more difficult to do so. The economy remains sluggish and consumers will actually go to another airline if they can save just $5 on a $400 fare.

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