Dont Worry Guy's they are not going stateside
Recent main contenders are DHL Air (UK) and EAT.
Thats unless the Dollars weakens further to about $2.50c to the £.
Then you might see them, but certainly not all, as there is far more profit to be made in the Europe than USA, and the A300 is not suitable for the pond.
Also DHL pilots in Europe have more experience operating the type both ETOPS and within Europe and the Middle East.
Also dont forget DHL put profits first, and yes the lower cost operation could win, but then if they can't prove themselves the aircraft can easilly go elsewhere.