Eight passengers were rescued from the aircraft, per the New York City Fire Department.
The airport was closed for hours after the crash but reopened at 2 p.m. with a single runway, the FAA said.
While the Air Canada Express Flight was descending into LGA just before midnight on Sunday, air traffic controllers were dealing with an incident on a separate aircraft.
"The cockpit is disintegrated. It's a terrible accident," Eyewitness News' John Del Giorno said following the collision of an Air Canada plane and Port Authority fire truck at LaGuardia Airport.
They landed 200 feet from shore and were both able to get themselves out and swim to safety.
A Singapore Airlines plane clipped its right wing with the tail of a Spirit Airlines plane as it was pushing back from the gate earlier this morning at Newark Airport.