@Brotherelf ...Re: @Mr Sceptical @VikiAi Don't travel to the US.
There are two ways this could break down...
1) He is in GOES and they do a background check of members. Assume that it would have past addresses and employment history.
They know who he is before he boarded the plane. So this wasn't random...
2) He gets selected randomly from the set of GOES passengers on the flight.
They have his background information, and he says something to flag him for further questioning. He could have been caught in a lie, or something.
Assume that they also have his social media posts. (I doubt it, but its possible)
Is there a third option?