Corrected entry: Right after the wedding fiasco, Samantha tries to cancel Carrie's honeymoon trip for her. She tells Carrie, Charlotte, and Miranda that she couldn't get Carrie a refund, but she instead got them all in (meaning the girls are now going to Mexico), and she has booked three more seats. However, there were already two seats booked (for Carrie and Big), so Samantha would only need to book two additional seats to accommodate all four of the girls.
raywest
22nd Nov 2012
Correction: With airline security the way it is these days, there is no way one of the other girls could have just filled Big's seat. They would have had to show ID and a boarding pass and passport with his information on it in order to be on the flight. Instead, and I'm sure Samantha knew this being that she's in PR, she most likely cancelled Big's ticket and then was able to "book three more" seats on the same flight so that the girls could go with Carrie.