Seen it mentioned in some newspaper articles. Means big pain in the bum apparently"

"If your boarding pass has the letters SSSS printed on it, it means your card is quite literally marked and you're all set for a thorough examination. The letters stand for Secondary Security Screening Selection and if they appear on your boarding pass, it means your name is on a highly classified roster - the Selectee List.

Designed by the US's Transportation Security Administration (TSA) for flights using American airspace, the SSSS tag means that passengers are also limited in their airport habits - they can not print out their boarding passes at home (they will receive an error message) nor check in at a kiosk; they must visit a counter, where their identification can be verified.

Read more: http://www.traveller.com.au/what-does-boarding-pass-ssss-code-mean-four-lette...

Not the end of the world but maybe get to the airport a bit earlier and check the contents of your phone and computer storage

"There are other traits, too, the TSA look out for when creating their database:

Passengers booking a one-way flight
Passengers who pay for their ticket in cash
"Random selection"

--
Tony Lee
Photos at https://picasaweb.google.com/114611728110254134379
Travels map at https://spotwalla.com/tripViewer.php?id=5cfc50ef7ac22ca2d&hoursPast=2400&...

Da wir unser Auto in USA überholen um danach von Kolumbien aus wieder nach Süden über Ecuador Peru Chile weiterzureisen, werden wir ein Weiterreiseticket von USA nach Kolumbien haben. Wäre das ein Grund für so einen Code?