Yes — Delta Air Lines does charge fees for checked baggage on many flights. For U.S. domestic flights, the fee is typically around US $35 for the first standard checked bag and US $45 for the second bag.
That said, there are exceptions: the fee can vary by route, fare type, whether you hold elite status or a qualifying credit card, and international travel may have different rules.
That said, there are exceptions: the fee can vary by route, fare type, whether you hold elite status or a qualifying credit card, and international travel may have different rules.