It's the last day to book a flight on Southwest Airlines without being hit with a fee to check bags after the airline abandoned a decades-long luggage policy that executives once described as key to differentiating the budget carrier from its rivals.

It’s the last day to book a flight on Southwest Airlines without being hit with a fee to check bags after the airline abandoned a decades-long luggage policy that executives once described as key to differentiating the budget carrier from its rivals.

Next week the carrier plans to kick off a new policy that will make flying more expensive for many of its customers.