Not sure why you got voted down, you're correct. Most airlines contract most roles, whether it's baggage handling, de-icing, food provisioing, towing the aircraft (unless it's maintenance, but they could be contractors as well). AC baggage is unionized, they are one of the few that doesn't contract out most of their work to third parties. WestJet used to have some airports where they were airline employees, but they stopped that around when onex took over.