(CNN) -- Delta Air Lines has withdrawn a surcharge it recently added to all domestic roundtrip bookings except those made on the airline's Web site.

The $2 surcharge ($1 for each domestic segment of a trip) was withdrawn "for competitive reasons," Delta spokesperson Peggy Estes said Tuesday.

"The market spoke and we responded to the market," she said, adding that the airline would have no further comment on the matter.

On January 11, Delta implemented the surcharge, notifying travel agents by posting a notice on computer reservation systems. The airline made no public announcement of the move at that time.

The surcharge applied to tickets bought from travel agencies as well as those purchased over the telephone from Delta and at the airline's offices and ticket counters. The charge also was added to tickets bought from Web sites other than Delta's own -- sites such as Travelocity, Expedia, Preview Travel and the Internet Travel Network (which supports the Reservation Desk at CNN.com).

The American Society of Travel Agents had criticized Delta for adding the surcharge and called its removal a "win for the traveling public."

"Delta's surcharge was clearly discriminatory against travelers who preferred using travel agents and those who do not have Internet access," said ASTA President and CEO Joe Galloway.

When Delta introduced the surcharge, the airline blamed the rising cost of traditional booking methods, citing the example of increasing booking fees it pays to computer reservation systems. The airline said its Web site is its lowest cost distribution channel.