I want to fly to Europe open-jaw with a return from Paris. On ITA software for July 4, 2009 the CDG-LHR-LAX return prices out at $837 CDG-LAX with AF1080 and BD4455 (UA935). With the same flights when I select the United flight number, it prices at €479 for CDG-LHR and $510.50 LAX-LAX, approximately $600 more (prices exclude taxes and fees). Is there anyway to get the lower fare without the codeshare or am I plain out of luck?