Two air traffic controllers at LaGuardia Airport left work early on the night of a deadly runway collision in March, a source familiar with the situation told CBS News.

Two LaGuardia Airport air traffic controllers in the control tower left work early the night an Air Canada Express flight collided with an airport fire truck on the runway,…

The March 22 collision between an Air Canada plane carrying 72 passengers and four crew and a fire truck on killed two pilots and seriously injured six others.