I've been pricing US-Australia flights for the last several weeks on set travel dates, and have been frustrated by a roughly $1200 pricing differential between Delta and V-Australia flights (same dates and within a few hours of each other; I want Delta metal for the MQMs). Pricing on the various aggregator sites, including expedia.com, yielded the same inflated prices on Delta metal. But get this: when I priced identical flights on expedia.com/AU, I got the delta-metal flights for nearly $1000 LESS than the price quoted on the Delta website or the U.S.-based version of expedia. It wasn't a fluke -- I booked the ticket, and all went through swimmingly (I paid for the ticket in Aussie dollars, but even after the currency conversion, I came out nearly $1000 ahead). Any ideas on why the price differential exists, or more importantly, how we can exploit such price differentials in the future?