Delta’s personalized AI pricing tech is provided by travel firm Fetcherr, which also partners with Virgin Atlantic, Azul, WestJet, and VivaAerobus. In Delta’s case, the AI will act as a “super analyst” that operates 24/7 to determine custom ticket prices that should be offered to individual customers in real-time, per specific flights and times.

Prices are based on Delta’s internal data, such as historical bookings, as well as external variables like weather and market trends.

Last year, Delta Air Lines announced it was testing out dynamic pricing on some flights using tools built by the tech company Fetcherr. And while the test was initially limited, executives from the company announced that 3% of flights now use AI pricing, and they hope to sell 20% of all tickets using a dynamic price by the end of the year.