I was in the same boat as OP. First time I flew internationally with GE, I got SSSS on the way back. Ticket purchased well in advance, US credit card, etc. I got SSSS'd at LIR (Liberia, Costa Rica). Interesting thing with GE and SSSS is getting extra screening at departure, but not talking to anyone at CBP at MIA! Annoying, but not worse than a rigorous TSA opt-out patdown, except for not expecting the waistband search as I wasn't warned by LIR security that it would be included. They should have as I almost had a reflex reaction to it that wouldn't have ended well for my screener. Only flight out of 54 that I've received it this year, in fact I'm the only person I've seen receive it on any of them (for whatever that is worth).