I'm not aware of any. I'd be surprised, since the Vigilant Guardian exercise was to simulate a bomber attack coming from outside the US, and Offutt is in Nebraska, the middle of the continent, and Offutt is not a base where fighters are kept at the ready. If you have evidence that there were aircraft from Offutt involved, please present it. Although I don't see how it relates to UAL175.
It does relate to the second part of my assertion, namely Offutt AFB.
I got the following information from this site,
http://killtown.911review.org/911smokingguns.html
Sept 9 - NORAD conducts operation 'Northern Vigilance,' planned months in advance, which deploys fighter jets to Alaskan region. (NORAD, Toronto Star)
9/11 - Three F-16 jetfighters from Andrews AFB, 15 miles from Pentagon, are flown 180 miles away for training mission in the morning. (Aviation Week)
9/11 - Andrews AFB, home to DC Air National Guard and Air Force 1 & 2, had no jetfighters on alert. (Newsday, USA Today)
9/11 - US intel agency planned exercise in the morning to simulate plane crash into government building. (Boston Globe, USA Today)
9/11 - NORAD was running war game called 'Vigilant Guardian' in which the commander in charge thought first hijacking was "part of the exercise." (Aviation Week, NY Observer)
9/11 - FAA bans takeoffs at 9:26 am for all civilian, military, or law enforcement aircraft (FAA, Time)
9/11 - A simulated aircraft hijacking was scheduled for the morning by NORAD. (Vanity Fair)
9/11 - Shoot-down authorization not communicated to NORAD until 28 minutes after Flight 93 crashed. (9/11 Panel, Seattle Post)
Feb '05 - Donald Rumsfeld, Gen. Myers confirm there were at least four war games on 9/11 from Rep. McKinney questioning. (C-SPAN)
This is an extract from a piece I downloaded called,
The 911 Mystery Plane, by Mark Gaffney.
The Air Force has four E-4Bs, and they are normally assigned to Offutt AFB, near Omaha, Nebraska. Offutt is the home of STRATCOM, i.e., the Strategic Command (formerly the Strategic Air Command).
Practicing Armageddon
According to one report, on September 11, 2001 three of the E-4Bs were participating in a live command-level exercise known as Global Guardian.[10] The exercise is an annual event, and is staged to test the readiness of the US military's command and control procedures involved in waging thermonuclear war. The 2001 exercise started the week before September 11 under the directorship of Admiral Richard Mies, commander-in- chief of STRATCOM. According to various reports, the drill was in "full swing" at the time of the 9/11 attack. Numerous other military commands were also involved, including NORAD. While few details have been released, we know that in previous years the US Space Command, the Air Combat Command, and the US Atlantic and Pacific Fleets were also involved.[11]
Starting in the 1990s, Global Guardian included pre-planned mock attacks upon the military's computer and information systems. For example, during the 1998 exercise "terrorists" attempted to disrupt STRATCOM's internal communications by hacking into its computers, and also by tying up its phone/FAX lines with phony messages.[12] Evidently, these "terrorist attacks" were at least partly successful, although the details have not been released. In recent years, the military has incorporated similar "attacks" into Global Guardian exercises. However, it is not known if these were a part of the 2001 drill. We do know that at the time of the 9/11 attack one of the E-4Bs was en route to Offutt AFB with a high-level military advisory panel on board, including its chairman, retired Lt. General Brent Scowcroft, evidently for the purpose of observing the exercise. The role of this panel, known as the Foreign Intelligence Advisory Board (FIAB), is to monitor US intelligence agencies. As we know, STRATCOM abruptly terminated the 2001 exercise at 9:03 AM, when Flight 175 crashed into the South Tower.[13] However, the E-4Bs remained aloft.[14]
In previous years the military always staged Global Guardian in October or November; and the 2001 exercise was likewise originally scheduled for October, according to various reports.[15] Curiously, however, for reasons never disclosed, the Joint Chiefs changed the plan and conducted the 2001 exercise during the week of September 11. The following year the date reverted back. The 2002 Global Guardian came off in October, as in previous years, and this has continued to be the case.[16]
All of which raises disturbing questions. Why did the Joint Chiefs change the date of Global Guardian in 2001? Even more importantly, why was the world's most sophisticated electronics warfare plane circling over Washington at the time of the September 11 attack? Recently, when the investigator who contacted me filed a Freedom of Information Act (FOIA) request with the Federal Aviation Administration (FAA) concerning the presence of the E-4B over Washington on 9/11, the FAA responded that it "had no knowledge" of such a plane. My contact also shared the basic information presented in this article with his Congressman, Rep. Adam Schiff (D-CA), and requested that he look into the matter. Schiff then made a formal inquiry through official channels, but was told that the Air Force knows nothing. Obviously, the pentagon is lying. If the E-4B was on a legitimate mission on September 11, why does the military deny its presence? Why would they do this?