FlyerTalk Forums - View Single Post - Dual Inventory Fares - Is there an idiot's guide anywhere?
Old Apr 17, 2018 | 2:33 am
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KARFA
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The best I found was a few threads discussing it, this is from the section in the TP thread on DIFs:

Dual Inventory Fares
These relatively new DIF fares have appeared from around mid-2016. They are a new type of fare to BA which effectively is almost like a POUG except the cost of the upgrade is included in the booking. They seem to be appearing mostly when purchasing WTP seats, and need inventory in both an economy and premium economy booking class. There have been difficulties with the fare mostly around attempting to upgrade in to CW using a GUF or by UuA.

When DIFs first appeared there were some comments that they could only be booked direct with BA and could not be booked with a TA. However, this seems to have changed and TAs can access DIFs now.

There is more discussion in the linked posts:
https://www.flyertalk.com/forum/brit...ta-matrix.html
http://www.flyertalk.com/forum/briti...ount-code.html
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