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Regulations mandating how often commercial planes communicate their location to authorities will change after this incident, to ensure that a similar situation cannot happen again.
One of the mysteries surrounding Malaysia Airlines Flight 370 concerns the aircraft’s transponder, which apparently stopped functioning about 40 minutes into the flight, leaving ground controllers in the dark about where the plane was.
A transponder is basically a robotic radio that automatically transmits a response when it receives an inquiry signal. Most airplanes are equipped with them.