March 24 (Reuters) - The National Transportation Safety

Board said on Tuesday that a system which would have allowed a

New York airport controller to track movement of airport and

vehicles did not alert during a Sunday night collision between

an Air Canada ( ACDVF ) commercial jet and a truck.

NTSB Chair Jennifer Homendy also told reporters in New York

the truck, which was crossing a LaGuardia Airport runway to

assist a separate plane, did not have a transponder. Homendy

added there were two controllers working.