Originally Posted by emailkid
And sometimes it takes them a while to actually single someone out. A good example was Yosuf Islam, better known to the work as Cat Stevens, who was not allowed into the US, in fact his plane landed in Canada on his way to (believe) NYC. After he deplaned, the rest of the pax continued on.
In Yosuf Islam's case the flight originated outside of North America. When the flight originates outside of North America it is policy not to submit the names for vetting (or whatever) until the flight is airborne. Go figure.