New details about the deadly LaGuardia Airport plane crash have revealed that the fire truck involved in the crash was not equipped with a key device to track its movements around the runway and it is unclear if the driver could hear the air tower's pleas to stop before the tragedy. The National Transportation Safety Board (NTSB) still doesn't know which air-traffic controller was responsible for ground activity at the time. The fire truck also lacked a transponder, a crucial piece of equipment that would give air-Traffic controllers a clear picture of where it was on Laguardia's runways. The crash, which killed both of the plane's pilots and injured dozens of people, occurred on Sunday.