Originally Posted by
Dimitri John Ledkov
Finair e-ticket is very nice! Will always ask for those in the future
The "fare calculation" line is very odd, is it all in USD? It has NUC & ROE and I cannot make the numbers add up.
However the numbers that do add up are the avios posting which has "total eligible spend" it is slightly different for the two flights and the total of them + government taxes does add up to the penny as per BA e-ticket email breakdown of costs.
Edit: managed to get fare calculation to work, it seems the carrier imposed charge YQ under Avios total eligible spend is split between the two flights by the ratio of the fares of each leg. And for my flight return leg ratio is 0.4722 and rounded.
The YQ is almost always the same in both directions so you can simply halve that. The fare calculation line shows the breakdown of the fare in each direction, in NUC (Neutral Units of Currency, a nominal IATA currency). The 0.7xx/0.8xx figure at the end of the line shows the exchange rate from NUC to the currency used for payment (multiply the NUC amount by that exchange rate to convert it - NUC are worth roughly the same as USD).
Alternatively you can use the ratio between the fare in each direction (in NUC) and the total fare (in NUC) and multiply the total fare (in GBP) by this ratio.
Another, probably much easier, approach is to use the 'total qualifying spend' figure on BAEC but this includes any optional extras you may have paid for, such as seat selection and extra luggage, which wouldn't count towards the downgrade reimbursement calculation.