I wonder if you had any knowledge about how baggage rules (2 pieces at 23kg vs. 1 piece at 20 kg.) get handled on multiple PNRs. I am traveling IAD-DXB on UA and DXB-SIN on SQ on one PNR and SIN-DAC on another PNR with about 10 hours layover at SIN. Both are United mileage awards, (there is a 10,800 miles limit on a US to Asia route on a single award.) I think I may be able to have them check it all the way at IAD. Or am I setting up myself for some humongous overage charges?