I don’t think anybody buys one way, there are so many cheap deals on returns they are mostly cheaper. I often fly out to Canada on A.Can but back with BA. We book a return trip for each leg of the journey and cancel the legs we don’t need. Crazy world.

As for this terrorist, is he in a US State where execution is permitted?

He will be tried in a federal court on terrorism charges (the fact that he is being tried in a civil criminal court – as per the Obama Administration, rather than a military tribunal is a subject of significant controversy here), and since no one was killed (through no lack of trying) he will not face the death penalty. The likely outcome for the terrorist in this case is “three hots and a cot” for at least a couple of decades in a federal prison – which, of course, is a far more generous fate than his would-be victims would have suffered if he had succeeded.