OGG-LAX/SLC/SEA are still on the schedule so you should be able to switch to any of these routings at an even exchange and get a one-stop to JFK. If these options aren't given to you via the "Change Flights" option on the website or if when trying to change flights the website is trying to collect additional fare, call DL and have an agent make the change for you. Also, depending on what other options are available on other airlines, you can ask for a refund and book another carrier since the adding of an additional stop is grounds for a full refund to the original form of payment.