Rebekah Roth, a 30 year airline stewardess retiree, based on the phone calls made from the "hijacked airplanes", figured out that the planes landed safely at an military airport nearby. That all the passengers were gassed and cremated at that airport as it had a crematorium. And that the planes were flown to Arizona to an airplane "cemetery", where they reside to this day. From the flight logs she figured out that it was a CIA/Mossad operation. She is in hiding under an alias as the deep state may be searching for her. She wrote 3 books that I recommend you read: Methodical Illusion, Methodical Deception, & Methodical Conclusion. Her website: https://readroth.com