I found a routing on the VS website (LHR-LAX-DFW) however that doesn't even come up as an option on DL's website and wondered if anyone knows why that might be? The flights do come up separately on DL's website (LHR-LAX and LAX-DFW) with seats avaliable on both segments however it's not appearing together as one itinerary like on the VS site. The first segment is operated by VS but the rest is operated by DL