If you're flying with Air Canada there's a small chance that you may not have a terrible time. If you have to call to talk to someone at Air Canada you won't be so lucky. Prepare to sit on hold for at least an hour to get through to a person. Once you finally get to talk to someone you will quickly learn that they have no interest in helping you. They're just trying to clear the call as quickly as possible and will generally be unhelpful.