the point i'm trying to make is that air canada doesn't care. if they did, they'd pad the schedule until they get what they want, making this discussion about on time performance all about nothing. yes, we can actually talk about getting flights out on time, but all other airlines pad schedules. you can't really adjust these stats based on how much or how little an airline schedules the flight longer, so even a 15 or 20% difference can be attributed to scheduling rather than how efficient an airline is in managing their processes.