Passengers should review the policy thoroughly and make sure everything is clear before proceeding with anything. ? The airline's 24-hour window allows passengers to change their flights free of charge within 24 hours of booking at ????-????????????-????????????-????????????????, regardless of ticket type or class. ? Airlines do not charge change fees for travel within the Delta States at ????-????????????-????????????-???????????????? and Canada, except for basic economy fares. ? If you cancel a basic economy fare, passengers will receive a travel credit instead (this credit is only valid for one year). ? The fare difference between the new and previous flights will apply. If the price of the new flight is higher than the previous flight, the passenger is entitled to pay the difference, and if the price is lower, the airline converts it into a travel credit.