[Arthur T]

Then I would wonder if an aux tank can be installed in a B737-800 to increase its range?
Or as the plane becomes heavier that adding more fuel tanks will decrease its range?
Finally, I just wondering should Virgin Australia and Qantas consider to buy the B737-700ER with standard layout. Because its 10000km or so range will enable Virgin and Qantas to launch some Mid-Haul Asian and Pacific routes, such as SYD - PPT, SIN - HBA, HKG - CNS, SYD - GUM, HKG - HBA etc.