Federal mediator Barney Dobbin called both groups back to negotiations Saturday morning.
The roughly 90 unionized maintenance workers — which include mechanics, electricians and administrative personnel — have been on strike since Sept. 11, 2012.
Both sides have agreed to a media blackout, which means neither party will be available for comment until talks conclude.
The airport authority said in September the Public Service Alliance of Canada asked for a 58 per cent wage increase over four years.
The union has said the employees have not seen a wage increase in four years and have been without a collective agreement since 2009.