Originally Posted by StuMcIlwain

This has been going on for decades, and happens because AC is not willing to invest in better infrastructure or more staff. They have gotten away with it due to the lack of competition and any decent customer protection legislation. They are supposed to give reasons for cancellations, but often don't. Their IT systems are supposed to automatically rebook you, but they seem not to work properly much of the time. During IROPS, you will struggle to find anyone at YYZ willing to help and the phone lines will be busy. To avoid this, pad your connection times and try to avoid last flights of the day. You can also buy their On My Way "insurance", which gives you a phone number that they will answer.