I'll be flying Premium Economy from MCO to BKK via DFW and HKG. Is there any way that I will be able to choose an MCE seat on the domestic portion MCO/DFW and also on the HKG/BKK portion with CP as a part of my PE ticket? Or would these be extra charges? Can one just pay the difference for the MCE seating, as an add on to my PE ticket, and can it be done on line?