I've flown once on Air Canada, around 25 years ago because the flight was on over booked and I was asked to take a different set of flights going through Canada to end up in Florida, they gave me money and made sure I got first class seats. Even back then, and in first class, the service was shit. Right from the moment you step on the plane and see the flight attendants, ALL of them were quite snooty. The feeling they gave off was "how dare you step onto this plane and make me work". Not just to me. Everyone got it. The meal was cold and basically tasted like a TV dinner. Long story short, if you're ever in Chicago (get the fuck out first of all) and have your flights out messed with, don't ever fly Air Canada just because it is the only option that can get you to your destination just a few hours later than your normal arrival time. I hope it is not an option anymore to use airlines from other countries, you'd be better off staying in a hotel right beside the airport and waiting until the next day, or even getting bussed somewhere else.