First night in Toronto

Arrived safely, although I found out my travel agent did something weird (I used the university travel services so I didn't have to pay for the ticket beforehand and get reimbursed and for backup if anything goes wrong with my flights) - I had to change planes in Chicago from United to Air Canada, but the United flight I was on for the first let was also going to Toronto (I think they took off about 1/2 hour apart). I have no idea why I had to change planes.