The airline touted a partnership with an AI-enabled revenue system as a step on the road to fully personalized ticket pricing, part of its goal to raise profit margins long-term.

Delta has a long-term strategy to boost its profitability by moving away from set fares and toward individualized pricing using AI. The pilot program, which uses AI for 3% of fares, has so far been “amazingly favorable,” the airline said. Privacy advocates fear this will lead to price-gouging, with one consumer advocate comparing the tactic to “hacking our brains.”