American, JetBlue ending partnership next week after judge blocks airline alliance

American and JetBlue will stop selling seats on each other's flights starting July 21.
The partnership was ruled to violate antitrust laws in the Northeast market.
Customers have until July 21 to add frequent flyer numbers to existing bookings.
American plans to appeal the decision, while JetBlue will focus on its acquisition of Spirit Airlines.
The end of the alliance may impact JetBlue's proposed merger with Spirit Airlines.