United has done away with its AD discount program for travel advisors.

The program offered travel advisors the opportunity to fly at discounts of up to 75% off of full fare criteria. The final year’s batch of AD authentication codes expired Feb. 29.

“The usage rate for this program was extremely low for the past few years and continued to trend lower each year, which led to its discontinuation,” spokeswoman Maddie King said.

United’s two U.S. legacy U.S. competitors, American and Delta, continue to offer AD discount programs.

Agency executives contacted by Travel Weekly were mostly unaware the program had ended. But most also said their agents have rarely or never used the program in recent years.

“They have never been cost effective for the traveler, and I can’t think of anyone still using those for employee discounts for travel,” said Denise Jackson, CEO of San Diego-based Balboa Travel.

Jackson explained that published fares can typically be found for less than the 75% off of full fare criteria. And AD tickets also have exclusions like no mileage, no seat assignments and no commission.

Peter Vlitas, senior vice president of airline relations for Internova Travel Group, offered a similar assessment.

“They became obsolete as the AD75 was off of a very high fare, and with the many lower fare options available it was not used,” he said. “We have not issued one in years.”

That sentiment, however, is not universal. Miles Nicholson, an executive whose office books travel mostly in the first and business class cabins, said that for premium seats, AD programs still offer meaningful discounts. Nicholson asked that the agency he contracts for not be mentioned in order to respect a confidentiality clause.

Like fam trips, AD programs offer agents the opportunity to familiarize themselves with an airline’s product, Nicholson said. Taking away such discounts impedes agents’ ability to develop a working knowledge of United’s premium cabin features, amenities and products so that they can compare them with offerings of other airlines.

“This seems to be the wrong message to send to travel agents worldwide if United is hoping for agent support in continuing to advocate and sell the brand,” Nicholson said.