I flew in on UA domestic at T1 and will be on OZ to ICN, which departs from T5. I followed the sign to T5 and then was told I had to change to an OZ boarding pass in order to get thru security. Now I'm stuck at T5 waiting for OZ check in counter to open, in two hours! Is this new policy or what? If I can't get thru security with UA-printed boarding pass for an OZ flight, why the hell did UA print it out for me? Why didn't they instead tell me to get it from OZ so that I knew not to exit the domestic terminal until OZ opens its door!