It's all one itinerary, ticketed by Delta (via Expedia).
Reason for the routing? Only need one-way air FLL-OAK and it was the least expensive routing. $213 for the full itinerary. Tried to book UA FLL-OAK via ORD, DEN or IAD but it was $300+ and could not upgrade out of FLL no matter which routing. Only upgrade space I could find was out of JFK.
Will see what Delta & Expedia have to say as far as reroute possibilities.