Looking at open jaw flights from SFO > CPH, then CDG > SFO. There's a United / Swiss from SFO > ZRH > CPH, then return via United CDG > SFO. Any thoughts on flying United/Swiss internationally vs flying KLM/AF/or Lufthansa? And if a 1 hr 55 min layover in ZRH is doable?

Also curious about differences between PE and Business class product between the airlines. I was thinking about flying KLM/AF and transferring points to Flying Blue but looks like you can't book open jaw tickets online (and have to call) which is a bit frustrating.