12:45 PM EST, 11/08/2024 (MT Newswires) -- The US Court of Appeals for the First Circuit on Friday upheld a lower court's ruling that blocked a joint venture between American Airlines ( AAL ) and JetBlue ( JBLU ) .

Under the joint venture, called the Northeast Alliance, the two airlines effectively agreed to operate as a single carrier with respect to most of their routes in and out of New York City and Boston, according to a court filing.

The US Department of Justice and several states filed suit to enjoin the airlines from proceeding with the joint venture under alleged violations of the Sherman Act, and the district court ruled in their favor.

American Airlines ( AAL ) and JetBlue ( JBLU ) did not immediately reply to requests for comment from MT Newswires.

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