Air traffic controllers were dealing with different emergency at time of LaGuardia collision
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.
An incoming United Airlines flight was experiencing an odor in its cabin and declared an emergency on board as some of the flight attendants were feeling ill, according to ATC audio recordings. The plane was asking for a gate to park at to let everyone out just before the collision with a different plane, and a fire truck happened.
The Port Authority fire truck radioed to Air Traffic Control, asking for permission to cross runway 4 to get to the United flight to check on passengers. But while Air Traffic Control could be heard giving the approval to cross, the Air Canada Express flight was descending onto the same runway.

"It is both significant and concerning," said Michael McCormick, a former VP of the FAA who used to be in charge of the airspace in the New York area.
According to McCormick, there's usually at least one controller directing ground traffic and at least one controller directing arrivals and departures. That's not what he heard initially on the audio recordings.
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