<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by aben1k:
Darren, thanks for your reply. I notice tfung's US itinerary is: HKG-NYC-DFW-ANC-DFW-BOS-LAX-GRU-SCL-MIA-DFW-LHR. How is this achieved? Or, more correctly, what am I missing? Cheers.</font>
DFW is not considered to be transcontinental.
You can fly SFO-DFW-BOS or SFO-ORD-BOS and that is allowed (but costs 2 segments).