[MENTION=10070524]OccasionallyFlying[/MENTION], since you seem to have some good info on this, maybe you know the answer.

Is the implementation of, and requirements for, ITD OSS different from airport to airport? I've used OSS a bunch at YYZ and YUL, and a couple times at YVR. There, it has always required a BP showing that you're eligible for OSS.

I recently went through it at YYC (WS FCO-YYC-YVR on one ticket), and I don't believe my BP had any indication of OSS. I had to show my incoming and onward BPs, but I think the CBSA guy looked at (not very closely) my inbound BP, and an airport employee looked at, may or may not have scanned, my outbound BP after I had seen CBSA. Unfortunately this was 2 months ago and I forgot to document it at the time, so my memory is a bit hazy, but I remember it all seeming very lax compared to YYZ/YUL/YVR.

In this case, I think it should have pretty clearly been eligible, but there didn't appear to be any checks. I could have been on separate tickets, or maybe even shown one AC BP and one WS one.

I was wondering whether there had been some change to OSS retirements, or whether YYC was just implementing it differently/wrong.