Five More Questions for the Troofers

Over at Counterknowledge, as a sequel to the 15 questions asked in December.

(3) To those who believe that the airphone calls by passengers to their loved ones were “morphed”: how exactly did the conspirators know how to get voice samples for the 59 crew and passengers aboard AA77, and the 40 aboard UA93? How did they predict which passengers would be aboard - notably Jeremy Glick (scheluded to take a flight the day before he boarded UA93) and Lauren Grandcolas (who was supposed to board a later flight on 11th September, but actually found a seat on UA93)? How did they anticipate (and prepare the appropriate responses for) questions their loved ones would ask once they received the calls? And how is it that their relatives didn’t notice anything untoward about the comments and responses their loved ones made (other than the obvious fact that the latter were due to die in a grotesque terrorist attack)?

Let me add here the case of Linda Gronlund, passenger on Flight 93:

Joseph DeLuca called his Dad; his girlfriend, Linda Gronlund, called her sister, Elsa Strong.

Elsa Strong says, "She said, 'Hi, Else, this is Lin. I just wanted to tell you how much I love you.' And she said, 'Please tell Mom and Dad how much I love them.' And then she got real calm and said, 'Now my will is in my safe and my safe is in my closet. and this is the combination.' And she just told me the combination of her safe. and then she just said, 'I don't know if I'm ever going to get a chance to tell you again in person how much I love you, but I'm really going to miss you.' And she said goodbye."

How did the government know the combination to Linda Gronlund's safe, and where it was located?