According to 9/11 conspiracy theorists, the four flights that originated from Boston, Washington Dulles, and Newark were landed someplace else. Perhaps from there, they were escorted off to some secret CIA prison (and executed?).
According to conspiracy theories, the two airplanes that hit the World Trade Center were military airplane substitutes that were painted to look like United and American Airlines commercial jets. These military "drones" were remotely controlled by the U.S. government.
When questioned about the passenger phone calls, conspiracy theorists believe that the U.S. government somehow faked them, with technology that can fake the voices of these passengers so well to trick the passengers' family members to whom they were speaking.
Here are the calls that took place:
About five minutes after the hijacking began on American Airlines Flight 11, Betty Ong contacted the American Airlines Southeastern Reservations Office in Cary, North Carolina, via an AT&T airphone to report an emergency aboard the flight. This was the first of several occasions on 9/11 when flight attendants took action outside the scope of their training, which emphasized that in a hijacking, they were to communicate with the cockpit crew. The emergency call lasted approximately 25 minutes, as Ong calmly and professionally relayed information about events taking place aboard the airplane to authorities on the ground.
At 8:52, in Easton, Connecticut, a man named Lee Hanson received a phone call from his son Peter, a passenger on United Airlines Flight 175. His son told him: "I think they've taken over the cockpit-An attendant has been stabbed- and someone else up front may have been killed. The plane is making strange moves. Call United Airlines-Tell them it's Flight 175, Boston to LA." Lee Hanson then called the Easton Police Department and relayed what he had heard.
Also at 8:52, a male flight attendant called a United office in San Francisco, reaching Marc Policastro. The flight attendant reported that the flight had been hijacked, both pilots had been killed, a flight attendant had been stabbed, and the hijackers were probably flying the plane. The call lasted about two minutes, after which Policastro and a colleague tried unsuccessfully to contact the flight.
At 8:59, Flight 175 passenger Brian David Sweeney tried to call his wife, Julie. He left a message on their home answering machine that the plane had been hijacked. He then called his mother, Louise Sweeney, told her the flight had been hijacked, and added that the passengers were thinking about storming the cockpit to take control of the plane away from the hijackers.
At 9:00, Lee Hanson received a second call from his son Peter:
"It's getting bad, Dad-A stewardess was stabbed-They seem to have knives and Mace-They said they have a bomb-It's getting very bad on the plane-Passengers are throwing up and getting sick-The plane is making jerky movements-I don't think the pilot is flying the plane-I think we are going down-I think they intend to go to Chicago or someplace and fly into a building-Don't worry, Dad- If it happens, it'll be very fast-My God, my God."
The call ended abruptly. Lee Hanson had heard a woman scream just before it cut off. He turned on a television, and in her home so did Louise Sweeney. Both then saw the second aircraft hit the World Trade Center.
At 9:12, Renee May called her mother, Nancy May, in Las Vegas. She said her flight (American Airlines Flight 77) was being hijacked by six individuals who had moved them to the rear of the plane. She asked her mother to alert American Airlines. Nancy May and her husband promptly did so.
At some point between 9:16 and 9:26, Barbara Olson called her husband, Ted Olson, the solicitor general of the United States. She reported that the flight had been hijacked, and the hijackers had knives and box cutters. She further indicated that the hijackers were not aware of her phone call, and that they had put all the passengers in the back of the plane. About a minute into the conversation, the call was cut off. Solicitor General Olson tried unsuccessfully to reach Attorney General John Ashcroft.
Shortly after the first call, Barbara Olson reached her husband again. She reported that the pilot had announced that the flight had been hijacked, and she asked her husband what she should tell the captain to do. Ted Olson asked for her location and she replied that the aircraft was then flying over houses. Another passenger told her they were traveling northeast. The Solicitor General then informed his wife of the two previous hijackings and crashes. She did not display signs of panic and did not indicate any awareness of an impending crash. At that point, the second call was cut off.
Thirteen passengers and crew members aboard United Airlines Flight 93 are known to have made calls. Except for two calls, all the calls came from onboard airphones, with information known about which airphones (which seat numbers) the calls came from.
The two cell phone calls (one from CeeCee Lyles and the other from Ed Felt) both occurred at 9:58. At that moment, the aircraft had descended to 5,000 ft above sea level (the elevations in that part of Pennsylvania are ~2,000+ ft). So, the plane was only ~2,000 - 3,000 feet above the ground at that point. The calls were dropped after ~1 minute, probably when the cell phone system attempted to transfer them to the next cell phone tower.
Please go here to see details on the calls: