Originally Posted by Jagboi

The report I saw is for 2018 as a whole. It doesn't break out each operator at various airports. It ranks AC's OTP at 67.3%, AS at 81.1% and DL at 82.8%
Seattle airport is ranked at 80.4%

Of all the airlines ranked (those than fly more than 18,000 scheduled flights per year including LCC), the only worse airlines than AC were China Southern, China Eastern and Air China. That makes AC #126 out of 129.