July 18, 2023: American and JetBlue will stop Alliance with American Airlines in the near future, two months after a federal judge ruled that the airlines’ association in the Northeast violated antitrust laws.

The judge ordered the airlines to end their more than two-year partnership, which allowed them to transfer passengers and revenue and to coordinate schedules in the northeastern U.S. The airlines argued they needed to team up to better compete with rivals Delta and United at congested airports serving New York City and Boston.

The Justice Department and the District of Columbia sued to block that partnership, winning their case on May 20.

″We are disappointed to be ending widespread benefits like codesharing and reciprocal loyalty benefits,” Dave Fintzen, Northeast Alliance’s Vice President at JetBlue, said in a statement. “With the court’s recent ruling and the termination of the NEA, we have to sunset them in short order.”

JetBlue said it wouldn’t appeal the ruling to focus instead on its $3.8 acquisition of Spirit Airlines, a deal which the Justice Department has also challenged. Nevertheless, JetBlue said it didn’t agree with the magistrate’s ruling on the Northeast Alliance. America, however, said it still plans to appeal the ruling on the Northeast Alliance.

Earlier this week, the carriers’ websites still showed flight options on each other’s airlines through the year-end holidays, but such sales will only continue through July 20.

Both airlines said they would work with customers with existing bookings so their plans aren’t disrupted.

“This is just the first step in the wind-down process that will take place over the coming months,” American said in a release. “We will continue to work with the JetBlue team to ensure customers with existing codeshare bookings can travel seamlessly without disrupting their travel plans.”

Thursday is also the final day customers can use American AAdvantage frequent flyer leagues to book flights on JetBlue.