NigelHuggins – I agree with you that DFW is not the paradise for transits. It is unorganized, spiced with rude ground staff.
Regarding the mass of Chinese at the immigration queue: there is no Chinese A380 going to Dallas. China Southern is to date the only Chinese airline with A380s in their fleet which on US routes they only serve LAX.
From my memory the only scheduled A380 flight into DFW is from Emirates.