Recent dp on the Delta Israel line:
I was on the KLM-Delta TLV-JFK codeshare flight in November. KLM just shifted its schedule, forcing an overnight connection. The Israel line refused to rebook on El Al, and only offered to rebook me onto the Delta nonstop, saying "So long as there are available Delta flights, we can only book you on Delta". Delta's chat service quickly and easily rebooked me onto El Al (after I asked to be rebooked on DL 7424).