American and JetBlue will stop selling seats on each other’s flights after Thursday, two months after a federal judge ruled that the airlines’ partnership in the Northeast violated antitrust laws.

The judge ordered the airlines to end their more than two-year partnership, which allowed them to share 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, six states and the District of Columbia sued to block that partnership, winning its case on May 20.

JetBlue last week said it wouldn’t appeal the ruling so it can focus instead on its $3.8 acquisition of Spirit Airlines, a deal which the Justice Department has also challenged. American, 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 airline through the year-end holidays but such sales will only continue through July 20.

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