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.

The airline announced the change in March, saying at the time that the the new policy would start with flights booked on Wednesday.

Southwest said Tuesday that it will be charging $35 for a first checked bag and $45 for a second checked bag. Weight and size limits will apply for bags.

Southwest had built years of advertising campaigns around its policy of letting passengers check up to two bags for free. Under its new policy, people who haven’t either reached the upper tiers of its Rapid Rewards loyalty program, bought a business class tick

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