Originally Posted by
KARFA
It is quite possible that this is the result of originally booking a Dual Inventory Fare (DIF) for WTP. These are cheaper WTP fares because the carrier surcharge is set lower than normal,
Sorry but in the interests of accuracy that isnt how DIF ( dual inventory fares) work. A lower discounted fare is generated depending on certain availability in a lower cabin. So for example to get a DIF fare you would have T class available in WTP and say O class in WT hence the name: dual inventory fare. Ive personally never seen a DIF with lower YQ compared to a non DIF.