The E4Bs were airborne as part of the 9/11 wargames, under the umbrella of Global Guardian run out of Offutt Air Force Base in Nebraska.
Follow the link to get a huge list of stories on the wargames. Here are some of the excerpts relating to Global Guardian and the E-4B "Doomsday" planes:
http://cooperativeresearch.org/timeline.jsp?timeli...
(...) Also on 9/11, three Doomsday planes (then known as “National Airborne Operations Center†planes) will be in the air, due to an exercise taking place that morning called Global Guardian (see Before 9:00 a.m. September 11, 2001). (...)
8:30 a.m. September 11, 2001: US Military Holding ‘Practice Armageddon’ Nationwide Training Exercise
Offutt Air Force Base control tower during Global Guardian ’98
As the 9/11 attacks are taking place, a large military training exercise called Global Guardian is said to be “in full swing.†It has been going on since the previous week. Global Guardian is an annual exercise sponsored by US Strategic Command (Stratcom) in cooperation with US Space Command and NORAD. One military author defines Stratcom as “the single US military command responsible for the day-to-day readiness of America’s nuclear forces.†Global Guardian is a global readiness exercise involving all Stratcom forces and aims to test Stratcom’s ability to fight a nuclear war. It is one of many “practice Armageddons†that the US military routinely stages. It links with a number of other military exercises, including Crown Vigilance (an Air Combat Command exercise), Apollo Guardian (a US Space Command exercise), and NORAD exercises Vigilant Guardian and Amalgam Warrior Global Guardian is both a command post and field training exercise, and is based around a fictitious scenario designed to test the ability of Stratcom and its component forces to deter a military attack against the US. Hundreds of military personnel are involved. According to a 1998 Internet article by the British American Security Information Council—an independent research organization—Global Guardian is held in October or November each year. In his book Code Names, NBC News military analyst William Arkin dates this exercise for October 22-31, 2001. And a military newspaper reported in March 2001 that Global Guardian was scheduled for October 2001. If this is correct, then some time after March, the exercise must have been rescheduled for early September. Furthermore, there may be another important facet to Global Guardian. A 1998 Defense Department newsletter reported that for several years Stratcom had been incorporating a computer network attack (CNA) into Global Guardian. The attack involved Stratcom “red team†members and other organizations acting as enemy agents, and included attempts to penetrate the Command using the Internet and a “bad†insider who had access to a key command and control system. The attackers “war dialed†the phones to tie them up and sent faxes to numerous fax machines throughout the Command. They also claimed they were able to shut down Stratcom’s systems. Reportedly, Stratcom planned to increase the level of computer network attack in future Global Guardian exercises. It is not currently known if a computer attack was incorporated into Global Guardian in 2001 or what its possible effects on the country’s air defense system would have been if such an attack was part of the exercise.
Before 9:00 a.m. September 11, 2001: Offutt Air Force Base, Nebraska, is Directing Global Guardian Training Exercise
Offutt Air Force Base, near Omaha, Nebraska, appears to be the headquarters of the US Strategic Command (Stratcom) exercise Global Guardian that is “in full swing†when the 9/11 attacks begin. At least the director of the exercise, Admiral Richard Mies, commander in chief of Stratcom, is at Offutt this morning. Because of Global Guardian, bombers, missile crews, and submarines around America are all being directed from Stratcom’s Command Center, a steel and concrete reinforced bunker below Offutt. This bunker is staffed with top personnel and they are at a heightened security mode because of the exercise. Because of Global Guardian, three special military command aircraft with sophisticated communications equipment, based at Offutt, are up in the air the morning of 9/11. These E-4B National Airborne Operations Center planes—nicknamed “Doomsday†planes during the Cold War—are intended to control nuclear forces from the air in times of crisis. They are capable of acting as alternative command posts for top government officials from where they can direct US forces, execute war orders and coordinate the actions of civil authorities in times of national emergency. The Federal Advisory Committee* (whose chairman is retired Lt. Gen. Brent Scowcroft) is aboard one of these Doomsday planes, being brought to Offutt to observe the exercise. Media accounts indicate Global Guardian is cancelled at Offutt shortly after the second WTC tower is hit (at 9:03 a.m.), with staff switching to “real-world mode.†However, even after Global Guardian is called off, the three E-4Bs remain airborne. Also, the morning of 9/11, a small group of business leaders are at Offutt Air Force Base for a charity fundraiser event due to take place there later in the day, hosted by the multi-billionaire Warren Buffett. When the attacks begin, these visitors are having breakfast with Admiral Mies, the director of Global Guardian. After the second WTC tower is hit, Mies excuses himself from the group, presumably to assist in canceling the exercise.
http://cooperativeresearch.org/timeline.jsp?timeli...
IMPORTANT * - article is mistaken about the name; the White House group Scowcroft chaired at the time is actually known as the President's Foreign Intelligence Advisory Board, PFIAB. This outfit has a long history dating back to Eisenhower as the civilian steering committee assigned to ostensibly oversee CIA and other covert foreign policy operations.
I wrote an analysis when this stuff was fist dug up by the Timeline in 2005:
http://www.911truth.org/article.php?story=20050830...
(...)
As the day dawns over the East Coast on September 11th, 2001, the US Strategic Command headquarters at Offutt Air Force Base in Nebraska is on full alert, busily dispatching warplanes around North America in a rehearsal for Armaggedon.
Stratcom directs the US nuclear arsenal. A number of interrelated air-defense wargames are underway around the country, under the overall umbrella of Global Guardian. This is the designation for the annual combined exercises run by Stratcom in conjunction with the US Space Command and NORAD, the North American Aerospace Defense Command. The man officially in charge of Global Guardian is Admiral Richard Mies, Stratcom's commander-in-chief.
(...)
In the period after March 2001, military planners discussed various possible exercises that would have involved hijacking simulations, including live-fly (FTX) exercises using real planes with actors playing passengers. It is known that the idea of rehearsing air defense against a hijacked plane aimed at the Pentagon was at least temporarily considered in April 2001 and postponed. Meanwhile, the planners of Amalgam Virgo II were discussing a simulation for simultaneous hijackings of passenger planes out of Utah and Vancouver, with military people and FBI agents acting in the roles of passengers and hijackers. As of spring 2001, Amalgam Virgo II was scheduled for July 2002.
The idea was hardly new. A mass casualty (MASCAL) exercise of the Pentagon's command and emergency services, using the scenario of a plane hitting the building, had already been conducted by hundreds of personnel at the Pentagon in October 2000. Two clinics at the Pentagon rehearsed the same script in May 2001.
All this activity, combined with the many past precedents of kamikaze attack attempts using civilian planes, completely demolish the lie frequently propagated by Condoleezza Rice and Donald Rumsfeld that "no one could have imagined" simultaneous hijackings or planes used as weapons against buildings. (See "Bush, Rice and the Genoa Warning")
But a more ominous question obviously presents itself: Were any of these hijacking scenarios under discussion that spring finally incorporated into the scripts for the wargames of September 2001?
That CNN covers this suddenly, matter-of-fact and without overheating when raising the "conspiracy" speculation, suggests someone there would like to focus on this issue. Interesting.