Originally Posted by
diburning
Do you have a name that may be similar to someone who might be on their list? Have you flown to or connected through countries with questionable relations with the US?
I remember a thread a while back where people seemed to think that they've been getting SSSS after transiting IST.
For most circumstances of the sort akin to that of the OP, the airline's security contractor do this thing. And it mostly has nothing to do with having been to "countries with questionable relations with the US".