Baggage handlers and ground crew for 30 airlines at Pearson Airport may be on strike by Thursday night.
Teamsters Local 419, which represents 700 employees at Swissport, isn't happy with the company's most recent offer.
Christopher Monette, a spokesman for the union, says that a strike could cause significant issues at the airport.
"We could be looking at severe delays, flight cancellations, other stuff that we would definitely prefer avoiding. What we want, again, is a fair deal for our members."
Monette says the union will ask its members to vote down Swissport's final offer on Thursday.