I have an award ticket ORD-PHL booked with AA at 6pm, which is the last segment of an itinerary. Now I need to fly ORD-SEA because of a last-minute change of my schedule, but I can't change ORD-PHL to ORD-SEA because it violates the oneworld award rules. So I bought a revenue ticket ORD-SEA at 6:45pm. It didn't occur to me until now that I will be in AA's system for two different flights at roughly the same time. Is this gonna be a problem when I check in for the 6:45pm flight? I will certainly check in before the 6pm flight departs.