ATLANTA - Delta Air Lines is imposing new or higher fees on a host of travelers, including frequent fliers, passengers traveling with pets and people booking their tickets over the phone.

The fee changes, which go into affect Tuesday, come as Delta and its competitors try to boost revenue to offset record fuel prices. Delta did not say how much revenue it expected from the fee changes, but the parent company of United Airlines said new luggage fees would generate more than $100 million annually. The industry has had mixed success with fare increases.

""Desperate people do desperate things,' said Minneapolis airline expert Terry Trippler.

Betsy Talton, a spokeswoman for Delta Air Lines Inc., the country's third-largest carrier, said Delta's additional fees are largely in response to fuel prices and said that the most recent attempts by Delta to raise fares ""have not been successful because there's also a need for Delta to be competitive.'

Talton said Delta continuously reviews all aspects of its business ""to make sure our business model is aligned with current costs.'

She said she did not know how much extra revenue the airline expected to generate annually from the fee changes.