Thanks! I didn't realized Chase didn't transfer to Delta. I thought they did. I will check out this website. Why would I be out of luck since I will be traveling within the next 9 months?
Reward flights often disappear quickly after reservations open, especially for business class, and reservations open anywhere from 12-9 months out. It helps to be flexible.
If you have trouble finding reward flights, you might have better luck splitting the flight. For example, if you're flying from Tulsa to JFK to London, find a business class reward flight for the JFK->London leg and then book the Tulsa->JFK separately in economy (maybe with cash instead of miles). This is because Tulsa->JFK rewards sell out more quickly.
Or, just skip it all, and use the Chase portal for economy+ tickets.