Unlike many Neil Simon efforts, which were written as plays and then adapted into a film, Simon wrote this directly for the screen when he realized that a play would have difficulty portraying the many different locations involved.
The stubs of the newly started towers of the World Trade Center, risen to 10 or so stories, are visible in the scenic view of Manhattan from the airplane. They are unmistakable because of their rusty red patina, which was still in place when the towers fell 32 years later.