Originally Posted by Full Score
You can thank the good ol' British socialist government for taxing Business and First Class international tickets at a higher rate than Economy ones.
That extra tax is GBP20 or USD 36 (and does not apply for transits, only departures from the UK). 90%+ of the "tax increase" is due to the fuel surcharges ... note that each airline has a different surcharge for the same route, AA is about half of BA or QF for example (depends on the route), so there can be several hundred USD difference in "taxes" just based on which carriers you are flying (for the same routing). Reissues will cause the new fuel surcharges to be charged.