Who's to blame for Air Canada crash at LaGuardia Airport? Here's what we know so far

The air traffic controller at LaGuardia Airport who sent a fire truck onto a runway where an Air Canada plane was landing shares responsibility with the truck’s driver for Sunday night’s deadly crash, according to aviation lawyers.

But a former Canadian air traffic controller cautions that determining all of the factors that led to the collision at this point would be “nigh on” to impossible.

“It’s always a cascade of events,” Dennis Wyche, who spent decades as an air traffic controller in Montreal, said Tuesday.