One thing I don't understand - why would the US care? Why expend resources on trying to capture Snowden? He's basically harmless at this point - he's passed all the information he had to few journalists (which would be a better target now) and there's no way anyone will ever let him near anything more secret than grandma's cookies recipe. Besides petty vengeance, what's the point?
As someone else noted, "the plane, which passed above the Outer Hebrides, the Highlands and Aberdeenshire, was dispatched from the American east coast on June 24 2013, the day after Snowden left Hong Kong for Moscow."