Join Date: Sep 2000
Location: Ottawa, Ontario, Canada
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Posts: 9,580
A written clarification from AC on OSS designation on boarding pass
See below (regarding Pearson airport) :
"OSS on a boarding pass is used when you arrive from the USA or international station, and are connecting to an international flight. When doing a connection of this nature, you must first see Canada customs officers and then a GTAA agent. Depending on if the boarding pass has OSS, the GTAA agent will direct you to a security check point, or to continue onwards to the gate area in international.
You will always go through security when connecting to a US or Canadian destination ..."