Relatives of those killed in a terrible air crash 43 years ago will be on hand today for the dedication of a memorial garden about 10 kilometres from Toronto's international airport.

Air Canada Flight 621 slammed into a farm field in what is now Brampton on July 5, 1970, killing all 109 passengers and crew.

Pilot error is blamed for the disaster.

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Some of those linked to the tragedy have spent years pressing for a permanent memorial site.

A group of developers has now put the garden in place.

The memorial has 109 stones and plaques with the names of the victims.