NEW DELHI: A Chicago-bound Boeing 777 of Air India on Monday returned to Delhi six hours after taking off from IGI airport as the aircraft suffered a transponder failure just when it was about to cross Afghanistan. The flight, AI 127 with 313 passengers and 16 crew members, had flown for about three hours out of India when the transponder failed.
The pilot then had to return to Delhi as an aircraft cannot enter Europe without a working transponder. The aircraft was a Boeing 777-300 ER (extended range).
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Before Monday's transponder failure, an AI Dreamliner too had suffered the same problem over Afghanistan about a fortnight back.
http://timesofindia.indiatimes.com/india/Chicago-bound-Air-India-flight-suffers-snag-back-to-Delhi-6-hours-after-take-off/articleshow/31776979.cms
and of course if you could "hack" traffic control, that would open some possibilities.
So presumably the “simulated information” is part of a NORAD exercise currently taking place, such as Vigilant Guardian (see (6:30 a.m.) September 11, 2001). Therefore, many minutes into the real 9/11 attacks, there may be false radar blips appearing on the screens of NORAD personnel. Additional details, such as whose radar screens have false blips and over what duration, are unclear. However, while the Toronto Star will indicate that the simulated material is removed from NORAD radar screens shortly before 9:03 a.m., when the second attack on the World Trade Center takes place, at 10:12 a.m. an officer at the operations center will call NEADS and ask it to “terminate all exercise inputs coming into Cheyenne Mountain” (see 10:12 a.m. September 11, 2001).
http://www.historycommons.org/timeline.jsp?day_of_9/11=complete_911_timeline_training_exercises&timeline=complete_911_timeline
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