Currently, I have two itineraries for flights that I am taking on August 10th. The first is for the second half of an itinerary that I started over the summer when I traveled to China. The second half has me going from Shanghai to Chicago, and then on to Charlotte a few hours later. Since I live in Raleigh, I decided to buy another ticket from Chicago to Raleigh/Durham that is on the second itinerary (the ticket was less than half the price of what it would have costs to change my ticket from Charlotte to Raleigh). Is it possible when I check in at Shanghai that I can tell them that I only want the flight from Shanghai to Chicago on the first itinerary and then I want to use the flight to Raleigh instead of the flight to Charlotte or will I have to re-check in when I get to Chicago to change to the flight to Raleigh? If I do have to re-check in at Chicago, will I still be considered to be traveling international so that I won't be charged for overweight bags and possible an extra one (saying that I’m within the limits for the international flight I was on)?