* Speculation*
I like my idea better. They are at some all-inclusive mega-resort in the Caribbean where they can film two legs in quiet secrecy, then secretly fly back to the United States from some remote private airport. Meanwhile, the crew of the Boeing 757 is enjoying an all-expense paid vacation while the plane is parked in a public location to trick us.
If they do it south enough, they can even say they visit three continents, I mean, who's going to care?