Originally Posted by
ls17031
MEX-DEN-YYZ pax would be rescreened by TSA at DEN to TSA standards. OSS eligibilty would be applicable from that point onwards.
Only if 'OSS' is marked on their boarding pass. Not always the case depending on the earlier carrier and if they participate in the OSS program or not.
Originally Posted by
ls17031
You are confusing OSS, which is a Transport Canada / CATSA program, with ITD which falls under the purview of the CBSA.
Once can certainly be OSS eligible but completely incapable of benefiting from due to CBSA processing needs such as you mention.
Right, but ITD and OSS go hand and hand. If you are not ITD eligible then you are not OSS eligible because you have to pickup your bags and exit Customs like regular passengers.