TWA Gal, TWA Kids and I (TWA Guy) are flying IAD-DEN-SLC next week, I'm 1K. I had the upgrade request removed for the outbound since the flight was downgauged from a 757 to an A319 and has been full up-front for months. We also want to sit together on the flights. DEN-SLC-DEN are on CRJ-200s. We're already upgraded on DEN-IAD, I used RPUs since it's a 777 and the kids were begging to try the lie flat seats. Do I need to be concerned about the PNR getting split? Thanks!