Do I need to call? I'm not finding any way to come up with the following itinerary online: EWR-TLV outbound (CO) and return TLV-ATL-PBI (DL) with both dates of travel happening during the second and third weeks of January.

It seems that CO's reward travel search does not include flights on DL metal and I'm finding the same problem, but vice versa, on DL's site.