"We felt we had no choice." said Bob Jackson, spokesman for the Public Service Alliance of Canada.
"YVR is demanding concessions but at the same time are budgeting millions of dollars per year on capital projects. Our members find this unacceptable."
The Public Service Alliance of Canada oversees the Union of Canadian Transportation Employees, which represents workers employed directly by the airport, including employees working in emergency response, runway maintenance and passenger loading operations.
Earlier this month, a spokesman for the Union of Canadian Transportation Employees said flexible shifts and protection from contracting out are two of the main issues at hand.
Negotiations between the union and the airport authority are scheduled for Wednesday and Thursday.
The union is advising the public to contact YVR and their airline to check on the status of flights scheduled for the end of this week because it's possible travellers could face significant delays heading into the Labour Day long weekend.