A fire-rescue truck involved in Sunday’s deadly collision at New York’s LaGuardia Airport was not equipped with a transponder — technology that helps air traffic controllers identify and track vehicles on the airfield — the National Transportation Safety Board said Tuesday. Also, the airport’s surface detection equipment – ASDE-X – didn’t generate an alert ahead of the collision “due to the close proximity of vehicles merging and unmerging near the runway,” NTSB chairwoman Jennifer Homendy said. 0:00 NTSB chairwoman Jennifer Homendy speaks 1:31 NTSB senior aviation investigator Doug Brazy recounts the timeline of the last three minutes before the collision 6:18 Homendy provides more details 14:05 Homendy: "Rarely, if ever, do we investigate an accident where it was one failure" 14:37 Homendy takes questions from press Watch more CNN here: cnn.it/4kh5RPe #LGA #NTSB #News