I see now and then a thread pops up on the UA section about a mixed trip with say a UA and LH flight and folks having a hard time getting boarding passes from one or the other airlines. I am looking to go to London in Sept and want to book it on BA's site using my AAdvantage number for mileage credit (I can book premium Econ RT from Austin for $1400 while the exact same flights on AA is over $3k WTF is this). It would be on AA metal to DFW then BA metal across the pond. Just wondering if anybody has had or know of any issues where the airlines of oneworld are not seeing the reservations. I would do the direct IAH-LHR but I can save $600 by going out of Austin. For that kind of cash I'll enjoy a nice drive and in-n-out burger before I fly. Sent using a small piece of fruit.