Originally Posted by
cbellero
A specific example
FROM: BAH:: EK EK EK
TO: BNE
Aug22, one-way
brings up a fare of 801 BHD with BAH-DXB in Y and DXB-SIN-BNE in F.
I was able to reproduce this. The fare construction (shown at the bottom of the details page) looks like this:
BAH EK X/DXB EK X/SIN EK BNE M 696.62BOWBH1 D DXBBNE 1415.84 NUC 2112.46 END ROE 0.3761 FARE BHD 795.000 XT 3.000BH 3.300WY
The trick here is the "D DXBBNE" part of this - this is a "mixed class differential" (MCD); namely we're charging the difference between the coach fare and the first class fare on the DXB-BNE portion of your trip in order to upgrade you to first class.
MCD is a standard IATA fare construction principle.