OK thanks for your answers. I will try in the future to also use Delta for my search.
I cant transfer directly to Delta with Chase UR, but it seems like that flying blue is giving me the bridge here.

Overall I am just surprised that they are making it so difficult.
One example is that I can by a RT from CHI-SFO and then SFO-HLL. But flying blue is unable to look directly for CHI-HLL with one stop in SFO. Strange to me.

Thanks for all your help.