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Emergency Locator Transmitters are crucial safety devices installed on aircraft, designed to emit a signal when activated, helping rescue teams locate and recover wreckage in the event of a crash. These devices have specific operational parameters that dictate how and when they can be activated.
In discussions surrounding the 9/11 attacks, one notable point of contention has arisen about the timing of the ELT signals for Flights 11 and 175. Evidence suggests that both transmitters sent out signals significantly before the planes impacted the World Trade Center.