I read somewhere that the syrians were in a "peace band" appearing in the US,,that ought to be easy to find out. Will yall excuse me while I google this?
If they were going to Vegas to play in a show, I can only assume their expenses, including a 1st class passenger (could have been FF miles or Gold/Platinum status) would have been paid for. However, they bought one way tickets and had return tickets on Jet Blue.
I cannot imagine how the FBI would have let these guys go unless they were confident of their itineraries. Then again, the Supreme Court recently ruled terrorists have the same legal rights as other criminals in the US.