Southwest passengers will notice many changes at their favorite airline, from baggage fees to flight credits to Rapid Rewards to assigned seats.

Southwest Airlines will introduce a new policy requiring portable chargers to be visible when they're in use onboard.

The end of “bags fly free” threatens to upend Southwest’s fine-tuned operation. Flight check-in lines could grow because it takes time to pay for bags. The number of carry-ons is expected to rise as travelers try to save money,