American Airlines said that it will book flights to capacity, effective July 1, in a press release on Friday.
The airline said it will notify customers and allow them to move to more open flights if they are available at no extra price.
“As more people continue to travel, customers may notice that flights are booked to capacity starting July 1,” the airline said, adding that customers can also move to another seat if space is available once boarding is complete.
American has blocked off 50 percent of the main cabin middle seats and has been notifying customers if their flight is crowded when they check in. Other airlines have been blocking all middle seats, including Delta, JetBlue, and Southwest.