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A preliminary investigation found the system which would have allowed an airport controller to track movement of airport vehicles "did not generate an alert due to the close proximity of vehicles merging and unmerging near the runway resulting in the inability to create a track of high confidence."
Fire truck in LaGuardia crash had no transponder to trigger warning, NTSB says
A fire truck that collided with an Air Canada jet at LaGuardia Airport lacked a transponder, the NTSB said.




