There's always the possibility that Annie Jacobsen has found a way to make money out of scare tactics. Consider the following:
***Since when does a passenger changing his mind about flying -- which happens a lot -- require an armed escort off the plane? And why did the airline provide a different plane for the flight? ***
An obvious explanation for the above is that the passenger might have planted an explosive device on the plane and then asked to be allowed to leave with the excuse of being "nervous." The authorities could not take a chance, and so they took him from the plane and checked his credentials. They also checked the plane and, in addition, ordered a new plane for the passengers. They were being very careful.
Since the passenger checked out to be clean, they found no reason to say anything but that he wanted to leave the plane.
How do you know the passenger was "checked out" and was "clean"?
Jacobsen is a career kook IMHO.