Yes, you can still use your Delta SkyMiles to book award travel on Hawaiian Airlines, but there are specific limitations to keep in mind. Delta and Hawaiian have a long-standing partnership that allows SkyMiles members to redeem miles for flights within the Hawaiian Islands (inter-island routes) and on certain flights between Hawaii and the U.S. West Coast. To book these, you generally must search through the Delta website or call Delta Reservations. However, with the Alaska Airlines-Hawaiian Airlines merger progressing through 2025 and 2026, the long-term future of this partnership is a point of frequent discussion in the travel industry. For now, the agreement remains active, and you can even earn SkyMiles when flying on Hawaiian-operated flights by adding your Delta number to the reservation. It is important to check for "blackout dates" and ensure that the "Award Space" is available, as these partner redemptions are often more limited than booking on Delta's own planes.