Originally Posted by
The Lev
You might be answering your own question.
Your proposed timing would be great for O-D traffic, but it would require anybody connecting to overnight in YYZ on the return segment.
That must be it.
Seems like there is no good answer to that, though.
If it were me and I were a transiting passenger walking off a 15 hour DEL-YYZ flight at 5am, I would check into an airport hotel.