Why don't they just refuse to allow any non US passport or Green Card carrying citizen to board a US bound flight unless they have passed extensive El Al style screening. It's not a right to board a plane, it's a privilege to enter a country's borders. If they don't make the cut they can hang in London or wherever else they're training fundamentalists. Why do we keep letting in these damn nut jobs? Don't let them on the plane! That simple. No one will miss these people making their way to the USA.