I recently flew on Singapore Airlines from Sydney to Singapore, and my boarding pass had
SSCI printed on it. What does this mean? Is it in some way related to the dreaded
SSSS (selected for extra security screening) at US airports?
Fortunately, the answer is rather mundane: it's short for Self-service check-in, meaning you've already checked in online but had a boarding pass reissued at the airport.
As far as I can tell this changes nothing about airport security etc, so I'm not entirely sure why this is worth recording on the boarding pass, but apparently somebody thought it was.