Originally Posted by
CKBA
Looking at fare differences, 'Fare 1' of a return on the same route with a similar bottom line is $439.00 in CW and $14.50 in WT - so logically the difference should be $439.00-14.50 - although I guess the 75% overrides that. Then there is the issue of the dreaded 'carrier imposed charges' - which presumably would be refunded pro rata (i.e. $2000 vs $350 return, so a refund of these of $2000/2 - $350/2 ???). Taxes are the same since (I presume) these only affect the UK departure, which is the same.
USA does have taxes but they split them up into various things like rodent control inspection or some such. But it doesn't vary them by class of travel, whereas the UK APD does. These taxes should be paid, then the rest is over to Mennens. So in this case follow the guidance in the wiki, and essentially add carrier surcharge into fare (where it belongs....) and yes pro-rata the estimated fare + surcharge. I have a sneaky feeling that the internal allocation of surcharge on BAH is different to other commercial tickets - in other words lower - since that's the easiest way to make BAH look competitive, but that's speculation on my part.