Originally Posted by
Moomba
I just plugged the same routing as I had above with the exception that I routed LAX-DFW on AA and the DFW-LHR on BA. This forced the system to use AA as the ticketing carrier. As a result the fare was 450 USD less.
I just did it LAX AA LHR BA MAN BA LHR BA BKK BA SYD QF SYD QF MEL QF SYD QF JFK AA LAX (it accepted SYD-JFK without counting LAX as transiting the point of origin). Total taxes/fee/fuel charges came to US$384.10.
Then I substituted LAX BA LHR, resulting in BA as the ticketing source, and total taxes/fees/fuel charges came to US$1093.10, a difference of US$709. Serious money.