Would have been interesting to know how many passengers were picked up in YYZ. It must have been quite a few as landing charges for a 744 at YYZ are exorbitant just for a starter. Perhaps it was cargo.

From Globe & Mail

"The Greater Toronto Airports Authority (GTAA) charges approximately $10,986 (U.S.) for a Boeing 747 to land at Toronto Pearson International Airport. This fee makes Pearson the most expensive airport globally for landing fees."