Southwest Airlines is doing away with its 50-year tradition and plans to start assigning seats and premium seating for customers who are seeking more legroom.

The airline said Thursday that it has been studying customer preferences and expectations and is making the changes because of what theyve heard, but it could also generate revenue and boost financial performance.

While Southwest has used an open seating model for 50 years, the company said that it understands that preferences have changed, with more customers taking longer flights and wanting an assigned seat.

Southwest unveiled changes to how it has boarded flights on the same day it reported that it topped profit and revenue expectations for the second quarter.

The airline is said it will offer redeye flights for the first time.

Southwest said that its first overnight, redeye flights will land on Feb. 14, 2025 in nonstop markets that include Las Vegas to Baltimore and Orlando; Los Angeles to Baltimore and Nashville; and Phoenix to Baltimore. It plans to phase in additional redeye flights over time.