To use another example the MD-11 (as obtained from the Boeing information page http://www.boeing.com/commercial/md-11family/index.html ) "The nonstop range of the standard MD-11 operating at a maximum takeoff weight of 602,500 pounds (273,290 kg) is approximately 7,630 statute miles (12,270 km) with 285 passengers and their bags. The extended-range version of the MD-11, equipped with an auxiliary fuel tank and operating at a higher maximum takeoff weight of 630,500 pounds (285,990 kg), has a range of approximately 8,225 statute miles (13,230 km)." Now i know that Delta had to MD-11's modified to do Los Angeles to Hong Kong so perhaps that version was used for the range quote. AM has the range as "McDonnell Douglas MD-11 7980"
I am not saying you guys have made a mistake but perhaps this one was overlooked. Thank you for taking the time to read this message.
OliAir