My wife and I both had SSSS on our boarding passes on the return from our honeymoon in November

IST-MUC-BOS-YYZ. First two legs on LH. Last on AC. It was definitely on both LH boarding passes but can't remember if it was on the AC one (we weren't able to get that until BOS anyhow).

Both of us had our stuff torn apart when entering the US, and 1hr later when clearing security to board BOS-YYZ flight we got tossed inside out again and the heavy pat down.

It is what it is. Probably necessary in this security environment, but definitely not fun when you run into a border guard who puts on the #ss$#le power trip act. No need for that.

Anyhow, the experience was enough to make me reconsider ever routing through the US again. And it seems that's quite common amongst the Canadian based FF on the board.