I think (don't quote me) that for a legal fare construction, you can't use YYZ on the YULYWG sector. Because YYZ and YTZ are "co-terminals" for fare construction purposes, if you return to the point of origin within the ticket, the fare might get split.

(That being said, there are somedays when I am sure that the fastest way from downtown to Pearson would probably be YTZ-YOW-YYZ!)

[This message has been edited by AC*SE (edited 11-17-2000).]