My sister & family are arriving SEA the day of cruise at 10:30am. It'll be their first cruise and I would like to make things as easy as possible for them. How does DCL Transfer work? Do they go to the terminal to pick them up or do they have to find the bus? Can I prepaid the transfer for them ahead of time through our TA (DU)? What happens if they missed their flight, would DCL schedule them for a later airport pickup?