Many retail companies plan to start charging customers for plastic bags on July 1, but other businesses have found ways to continue offering free bags without violating the government’s rules.

Delta Air Lines has changed its domestic baggage policy, affecting how early travelers must arrive at the airport.

Southwest will continue to offer two free checked bags to Rapid Rewards A-List Preferred Members and Customers traveling on Business Select fares, and one free checked bag to A-List Members, the ...