I have absolutely no idea. In fact, I'm taking advantage of the Canada sale right now and booking BWI-YYZ-ORD-DCA-BWI round-trips instead of BWI-ORD-BWI. It's cheaper and I get twice as many miles and segments.
The BWI-YYZ leg is operated by Air Canada. Actually, the ticket shown above can be booked as a single RT, taking advantage of the Canada sale.
Plus, I planned a nice layover so I can take advantage of Canada's third-world currency. Maybe I'll get bumped and stay for a while!
[This message has been edited by Tino (edited 01-15-2001).]