Air safety investigators say a runway alert system did not activate before a fatal collision between an Air Canada Express flight and a fire truck at New York’s LaGuardia Airport, as new details outline the aircraft’s final seconds and system performance.

Air Canada has said that four passengers and crew from the fatal collision at LaGuardia on Sunday night are still being treated in hospitals almost four days after the accident.

Rousseau said he was "deeply saddened" that his inability to speak French ‌had diverted attention ⁠from the profound grief of the victims' families.