i've a quick question.
flying muc - yyz - sfo tomorrow and OSS is on the Boarding pass YYZ SFO
1. Does i have any benifits with OSS , if so which direction i have to go after deboarding.
2. Why did i get OSS it's because of C or TSA/GE Member

1) No, there no benefit on that route as you must still clear US-bound security. Just follow the signed for US connections.
2) You get OSS because you're departing from an OSS qualified airport (MUC) on an OSS qualified carrier (AC), it is not dependant on C/J or GE, and is offered to first-time flyers in Y as well. Were you connecting to a flight within Canada or to a non-US country, it would mean that you wouldn't reclear security in YYZ. However, as the US demands a special level of security, you have to reclear anyways.

I think the logic behind the explanation is the USA currently only recognizes passengers who went through security screening in either the USA or Canada as "clean". So if you're flying from Munich to Chicago, you have to be re-screened either in Chicago (if flying nonstop MUC-ORD) or a Canada transfer airport to be able to board another flight out of Chicago.

Officially they accept the screening from any location that meet their standards, and every airport offering direct flights to the US is obligated to screen US-bound passengers to their standards. That's why you see separate US-bound gates / terminals with their own security at airport around the world, even those without preclearance facilities (think Z gates in FRA and E gates in ZRH). However, those airport don't necessarily screen non-US bound passengers to the same standards, and therefore the US won't accept in-bound OSS as it's not done to the correct standard.

The issue on MUC-ORD-SFO (for example) is that there is no sterile immigration/customs facilities in ORD (or any other US airport), so you'd have access to your bags and therefore would need to reclear security before your connection. However, if you arrive from a preclearance facility (and therefore don't need to use the immigration facilities), you're good to go assuming you land at the right terminal or can do a sterile terminal transfer. So for example AUH-JFK on EY can sterile connect to JFK-SFO on DL. Same would go for flights from DUB, SNN, etc..

If/when the US establishes sterile clearance/transfer facilities, you'll see this issue come back to the surface. Right now from a practical standpoint they only accept screening done at a preclearance facility. They don't have to worry about if they should accept screening done in, for instance, CAI, because there isn't preclearance there, so everyone needs to be recleared anyways.

Yes, you had the right explanation and I did not. Basically, it comes down to preclearance airports and the vast majority of those passengers are inbound from Canada. I guess we can add Dublin, Shannon, Abu Dhabi, and two or three or so in the Caribbean to that list. The key is they all arrive as if they are domestic flights.

Does YVR have any plans of implementing OSS?

I got this today for EWR-YUL-BRU (ITI OSS). WIll be interesting to see (all AC itinerary) what happens at YUL.

I'm no expert, but I'm under the impression that the current layout of YVR would need heavy modification to become OSS-compliant.

How did it go?

YVR
 

I thought about this again and think the litmus test might be an airport such as YEG. Those familiar with YEG know there's a special door that leads from the domestic concourse to US-CBP. I've never made a connection to the US at YEG so I've never gone through this door. If there's anyone out there who has made this connection at YEG, do you have to go through security screening all over again?

What makes YEG different than a place like YYZ is there's no commingling of passengers from overseas involved. The only people who can go through that special door are people who have been through security screening at a Canadian airport. For example, someone coming in from AMS to YEG would not be on that domestic concourse. This is different than YYZ T1 where inbound passengers making a Canada -- USA connection mix with other international to US passengers who just stepped off their plane.

ITD OSS has just started - 14JUL2018 in YVR. There is a bus from customs hall to domestic gates...takes less than 5mins.

Oooh nice. I am flying SEA - YVR -YUL tomorrow and I have the OSS text on my boarding pass. I always hated to go through security again. Is the bus clearly marked? Just to double check, I don't need to get my bags, right?

AC-AC. Yeah, lately we haven't needed to reclaim bags, but needed to go though security again... which is additionally annoying as they don't have a Nexus or priority lane. So the line can be long

FYI, currently in YVR, and I did have to go through security again. I asked a few agents and showed them my boarding pass, but no one knew about it. One person vaguely heard something about it, but said it ends at 10pm. (It was 10:30 ish)